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annotate runtime/doc/channel.txt @ 9147:053bc64433ec v7.4.1857

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commit https://github.com/vim/vim/commit/9f5842e63fc63d438cbffcec503e072a06f74dc2 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 29 16:17:08 2016 +0200 patch 7.4.1857 Problem: When a channel appends to a buffer that is 'nomodifiable' there is an error but appending is done anyway. Solution: Add the 'modifiable' option. Refuse to write to a 'nomodifiable' when the value is 1.
author Christian Brabandt <cb@256bit.org>
date Sun, 29 May 2016 16:30:06 +0200
parents bc38030aec7d
children ecb621205ed1
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1 *channel.txt* For Vim version 7.4. Last change: 2016 May 29
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4 VIM REFERENCE MANUAL by Bram Moolenaar
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7 Inter-process communication *channel*
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9 DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT
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11 Vim uses channels to communicate with other processes.
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12 A channel uses a socket or pipes *socket-interface*
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13 Jobs can be used to start processes and communicate with them.
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15 Vim current supports up to 10 simultaneous channels.
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16 The Netbeans interface also uses a channel. |netbeans|
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18 1. Overview |job-channel-overview|
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19 2. Channel demo |channel-demo|
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20 3. Opening a channel |channel-open|
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21 4. Using a JSON or JS channel |channel-use|
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22 5. Channel commands |channel-commands|
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23 6. Using a RAW or NL channel |channel-raw|
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24 7. More channel functions |channel-more|
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25 8. Starting a job with a channel |job-start|
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26 9. Starting a job without a channel |job-start-nochannel|
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27 10. Job options |job-options|
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28 11. Controlling a job |job-control|
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30 {Vi does not have any of these features}
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31 {only when compiled with the |+channel| feature for channel stuff}
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32 {only when compiled with the |+job| feature for job stuff}
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34 ==============================================================================
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35 1. Overview *job-channel-overview*
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37 There are four main types of jobs:
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38 1. A deamon, serving several Vim instances.
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39 Vim connects to it with a socket.
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40 2. One job working with one Vim instance, asynchronously.
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41 Uses a socket or pipes.
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42 3. A job performing some work for a short time, asynchronously.
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43 Uses a socket or pipes.
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44 4. Running a filter, synchronously.
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45 Uses pipes.
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46
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47 For when using sockets See |job-start|, |job-start-nochannel| and
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48 |channel-open|. For 2 and 3, one or more jobs using pipes, see |job-start|.
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49 For 4 use the ":{range}!cmd" command, see |filter|.
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51 Over the socket and pipes these protocols are available:
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52 RAW nothing known, Vim cannot tell where a message ends
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53 NL every message ends in a NL (newline) character
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54 JSON JSON encoding |json_encode()|
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55 JS JavaScript style JSON-like encoding |js_encode()|
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57 Common combination are:
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58 - Using a job connected through pipes in NL mode. E.g., to run a style
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59 checker and receive errors and warnings.
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60 - Using a deamon, connecting over a socket in JSON mode. E.g. to lookup
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61 crosss-refrences in a database.
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63 ==============================================================================
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64 2. Channel demo *channel-demo* *demoserver.py*
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66 This requires Python. The demo program can be found in
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67 $VIMRUNTIME/tools/demoserver.py
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68 Run it in one terminal. We will call this T1.
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70 Run Vim in another terminal. Connect to the demo server with: >
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71 let channel = ch_open('localhost:8765')
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73 In T1 you should see:
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74 === socket opened === ~
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76 You can now send a message to the server: >
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77 echo ch_evalexpr(channel, 'hello!')
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79 The message is received in T1 and a response is sent back to Vim.
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80 You can see the raw messages in T1. What Vim sends is:
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81 [1,"hello!"] ~
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82 And the response is:
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83 [1,"got it"] ~
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84 The number will increase every time you send a message.
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86 The server can send a command to Vim. Type this on T1 (literally, including
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87 the quotes):
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88 ["ex","echo 'hi there'"] ~
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89 And you should see the message in Vim. You can move the cursor a word forward:
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90 ["normal","w"] ~
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92 To handle asynchronous communication a callback needs to be used: >
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93 func MyHandler(channel, msg)
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94 echo "from the handler: " . a:msg
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95 endfunc
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96 call ch_sendexpr(channel, 'hello!', {'callback': "MyHandler"})
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97 Vim will not wait for a response. Now the server can send the response later
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98 and MyHandler will be invoked.
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99
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100 Instead of giving a callback with every send call, it can also be specified
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101 when opening the channel: >
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102 call ch_close(channel)
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103 let channel = ch_open('localhost:8765', {'callback': "MyHandler"})
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104 call ch_sendexpr(channel, 'hello!')
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105
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106 When trying out channels it's useful to see what is going on. You can tell
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107 Vim to write lines in log file: >
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108 call ch_logfile('channellog', 'w')
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109 See |ch_logfile()|.
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110
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111 ==============================================================================
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112 3. Opening a channel *channel-open*
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113
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114 To open a channel: >
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115 let channel = ch_open({address} [, {options}])
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116 if ch_status(channel) == "open"
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117 " use the channel
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118
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119 Use |ch_status()| to see if the channel could be opened.
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120
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121 {address} has the form "hostname:port". E.g., "localhost:8765".
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122
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123 {options} is a dictionary with optional entries: *channel-open-options*
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124
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125 "mode" can be: *channel-mode*
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126 "json" - Use JSON, see below; most convenient way. Default.
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127 "js" - Use JS (JavaScript) encoding, more efficient than JSON.
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128 "nl" - Use messages that end in a NL character
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129 "raw" - Use raw messages
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130 *channel-callback* *E921*
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131 "callback" A function that is called when a message is received that is
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132 not handled otherwise. It gets two arguments: the channel
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133 and the received message. Example: >
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134 func Handle(channel, msg)
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135 echo 'Received: ' . a:msg
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136 endfunc
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137 let channel = ch_open("localhost:8765", {"callback": "Handle"})
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138 <
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139 When "mode" is "json" or "js" the "msg" argument is the body
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140 of the received message, converted to Vim types.
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141 When "mode" is "nl" the "msg" argument is one message,
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142 excluding the NL.
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143 When "mode" is "raw" the "msg" argument is the whole message
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144 as a string.
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145
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146 For all callbacks: Use |function()| to bind it to arguments
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147 and/or a Dictionary. Or use the form "dict.function" to bind
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148 the Dictionary.
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149
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150 Callbacks are only called at a "safe" moment, usually when Vim
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151 is waiting for the user to type a character. Vim does not use
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152 multi-threading.
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153
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154 *close_cb*
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155 "close_cb" A function that is called when the channel gets closed, other
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156 than by calling ch_close(). It should be defined like this: >
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157 func MyCloseHandler(channel)
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158 < Vim will invoke callbacks that handle data before invoking
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159 close_cb, thus when this function is called no more data will
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160 be received.
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161 *waittime*
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162 "waittime" The time to wait for the connection to be made in
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163 milliseconds. A negative number waits forever.
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164
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165 The default is zero, don't wait, which is useful if a local
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166 server is supposed to be running already. On Unix Vim
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167 actually uses a 1 msec timeout, that is required on many
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168 systems. Use a larger value for a remote server, e.g. 10
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169 msec at least.
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170 *channel-timeout*
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171 "timeout" The time to wait for a request when blocking, E.g. when using
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172 ch_evalexpr(). In milliseconds. The default is 2000 (2
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173 seconds).
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174
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175 When "mode" is "json" or "js" the "callback" is optional. When omitted it is
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176 only possible to receive a message after sending one.
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177
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178 To change the channel options after opening it use |ch_setoptions()|. The
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179 arguments are similar to what is passed to |ch_open()|, but "waittime" cannot
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180 be given, since that only applies to opening the channel.
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181
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182 For example, the handler can be added or changed: >
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183 call ch_setoptions(channel, {'callback': callback})
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184 When "callback" is empty (zero or an empty string) the handler is removed.
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185
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186 After a callback has been invoked Vim will update the screen and put the
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187 cursor back where it belongs. Thus the callback should not need to do
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188 `:redraw`.
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189
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190 The timeout can be changed: >
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191 call ch_setoptions(channel, {'timeout': msec})
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192 <
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193 *channel-close* *E906*
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194 Once done with the channel, disconnect it like this: >
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195 call ch_close(channel)
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196 When a socket is used this will close the socket for both directions. When
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197 pipes are used (stdin/stdout/stderr) they are all closed. This might not be
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198 what you want! Stopping the job with job_stop() might be better.
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199 All readahead is discarded, callbacks will no longer be invoked.
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200
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201 Note that a channel is closed in three stages:
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202 - The I/O ends, log message: "Closing channel". There can still be queued
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203 messages to read or callbacks to invoke.
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204 - The readahead is cleared, log message: "Clearing channel". Some variables
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205 may still reference the channel.
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206 - The channel is freed, log message: "Freeing channel".
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207
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208 When the channel can't be opened you will get an error message. There is a
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209 difference between MS-Windows and Unix: On Unix when the port doesn't exist
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210 ch_open() fails quickly. On MS-Windows "waittime" applies.
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211 *E898* *E901* *E902*
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212
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213 If there is an error reading or writing a channel it will be closed.
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214 *E630* *E631*
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215
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216 ==============================================================================
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217 4. Using a JSON or JS channel *channel-use*
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218
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219 If mode is JSON then a message can be sent synchronously like this: >
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220 let response = ch_evalexpr(channel, {expr})
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221 This awaits a response from the other side.
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222
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223 When mode is JS this works the same, except that the messages use
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224 JavaScript encoding. See |js_encode()| for the difference.
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225
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226 To send a message, without handling a response or letting the channel callback
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227 handle the response: >
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228 call ch_sendexpr(channel, {expr})
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229
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230 To send a message and letting the response handled by a specific function,
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231 asynchronously: >
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232 call ch_sendexpr(channel, {expr}, {'callback': Handler})
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233
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234 Vim will match the response with the request using the message ID. Once the
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235 response is received the callback will be invoked. Further responses with the
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236 same ID will be ignored. If your server sends back multiple responses you
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237 need to send them with ID zero, they will be passed to the channel callback.
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238
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239 The {expr} is converted to JSON and wrapped in an array. An example of the
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240 message that the receiver will get when {expr} is the string "hello":
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241 [12,"hello"] ~
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242
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243 The format of the JSON sent is:
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244 [{number},{expr}]
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245
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246 In which {number} is different every time. It must be used in the response
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247 (if any):
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248
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249 [{number},{response}]
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250
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251 This way Vim knows which sent message matches with which received message and
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252 can call the right handler. Also when the messages arrive out of order.
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253
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254 The sender must always send valid JSON to Vim. Vim can check for the end of
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255 the message by parsing the JSON. It will only accept the message if the end
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256 was received.
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257
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258 When the process wants to send a message to Vim without first receiving a
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259 message, it must use the number zero:
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260 [0,{response}]
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261
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262 Then channel handler will then get {response} converted to Vim types. If the
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263 channel does not have a handler the message is dropped.
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264
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265 It is also possible to use ch_sendraw() and ch_evalraw() on a JSON or JS
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266 channel. The caller is then completely responsible for correct encoding and
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267 decoding.
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268
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269 ==============================================================================
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270 5. Channel commands *channel-commands*
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271
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272 With a JSON channel the process can send commands to Vim that will be
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273 handled by Vim internally, it does not require a handler for the channel.
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274
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275 Possible commands are: *E903* *E904* *E905*
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276 ["redraw" {forced}]
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277 ["ex", {Ex command}]
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278 ["normal", {Normal mode command}]
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279 ["expr", {expression}, {number}]
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280 ["expr", {expression}]
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281 ["call", {func name}, {argument list}, {number}]
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282 ["call", {func name}, {argument list}]
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283
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284 With all of these: Be careful what these commands do! You can easily
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285 interfere with what the user is doing. To avoid trouble use |mode()| to check
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286 that the editor is in the expected state. E.g., to send keys that must be
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287 inserted as text, not executed as a command:
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288 ["ex","if mode() == 'i' | call feedkeys('ClassName') | endif"] ~
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290 Errors in these commands are normally not reported to avoid them messing up
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291 the display. If you do want to see them, set the 'verbose' option to 3 or
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292 higher.
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295 Command "redraw" ~
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297 The other commands do not update the screen, so that you can send a sequence
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298 of commands without the cursor moving around. You must end with the "redraw"
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299 command to show any changed text and show the cursor where it belongs.
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300
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301 The argument is normally an empty string:
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302 ["redraw", ""] ~
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303 To first clear the screen pass "force":
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304 ["redraw", "force"] ~
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305
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306
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307 Command "ex" ~
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308
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309 The "ex" command is executed as any Ex command. There is no response for
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310 completion or error. You could use functions in an |autoload| script:
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311 ["ex","call myscript#MyFunc(arg)"]
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312
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313 You can also use "call |feedkeys()|" to insert any key sequence.
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314
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315 When there is an error a message is written to the channel log, if it exists,
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316 and v:errmsg is set to the error.
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317
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318
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319 Command "normal" ~
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320
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321 The "normal" command is executed like with ":normal!", commands are not
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322 mapped. Example to open the folds under the cursor:
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323 ["normal" "zO"]
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324
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325
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326 Command "expr" with response ~
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327
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328 The "expr" command can be used to get the result of an expression. For
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329 example, to get the number of lines in the current buffer:
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330 ["expr","line('$')", -2] ~
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331
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332 It will send back the result of the expression:
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333 [-2, "last line"] ~
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334 The format is:
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335 [{number}, {result}]
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336
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337 Here {number} is the same as what was in the request. Use a negative number
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338 to avoid confusion with message that Vim sends. Use a different number on
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339 every request to be able to match the request with the response.
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340
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341 {result} is the result of the evaluation and is JSON encoded. If the
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342 evaluation fails or the result can't be encoded in JSON it is the string
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343 "ERROR".
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344
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345
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346 Command "expr" without a response ~
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347
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348 This command is similar to "expr" above, but does not send back any response.
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349 Example:
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350 ["expr","setline('$', ['one', 'two', 'three'])"] ~
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351 There is no third argument in the request.
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352
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353
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354 Command "call" ~
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355
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356 This is similar to "expr", but instead of passing the whole expression as a
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357 string this passes the name of a function and a list of arguments. This
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358 avoids the conversion of the arguments to a string and escaping and
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359 concatenating them. Example:
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360 ["call", "line", ["$"], -2] ~
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361
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362 Leave out the fourth argument if no response is to be sent:
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363 ["call", "setline", ["$", ["one", "two", "three"]]] ~
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365 ==============================================================================
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366 6. Using a RAW or NL channel *channel-raw*
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367
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368 If mode is RAW or NL then a message can be send like this: >
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369 let response = ch_evalraw(channel, {string})
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370
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371 The {string} is sent as-is. The response will be what can be read from the
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372 channel right away. Since Vim doesn't know how to recognize the end of the
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373 message you need to take care of it yourself. The timeout applies for reading
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374 the first byte, after that it will not wait for anything more.
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375
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376 If mode is "nl" you can send a message in a similar way. You are expected
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377 to put in the NL after each message. Thus you can also send several messages
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378 ending in a NL at once. The response will be the text up to and including the
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379 first NL. This can also be just the NL for an empty response.
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380 If no NL was read before the channel timeout an empty string is returned.
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381
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382 To send a message, without expecting a response: >
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383 call ch_sendraw(channel, {string})
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384 The process can send back a response, the channel handler will be called with
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385 it.
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386
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387 To send a message and letting the response handled by a specific function,
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388 asynchronously: >
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389 call ch_sendraw(channel, {string}, {'callback': 'MyHandler'})
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390
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391 This {string} can also be JSON, use |json_encode()| to create it and
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392 |json_decode()| to handle a received JSON message.
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393
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394 It is not possible to use |ch_evalexpr()| or |ch_sendexpr()| on a raw channel.
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395
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396 ==============================================================================
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397 7. More channel functions *channel-more*
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398
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399 To obtain the status of a channel: ch_status(channel). The possible results
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400 are:
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401 "fail" Failed to open the channel.
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402 "open" The channel can be used.
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403 "buffered" The channel was closed but there is data to read.
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404 "closed" The channel was closed.
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405
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406 To obtain the job associated with a channel: ch_getjob(channel)
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407
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408 To read one message from a channel: >
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409 let output = ch_read(channel)
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410 This uses the channel timeout. To read without a timeout, just get any
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411 message that is available: >
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412 let output = ch_read(channel, {'timeout': 0})
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413 When no message was available then the result is v:none for a JSON or JS mode
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414 channels, an empty string for a RAW or NL channel.
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415
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416 To read all output from a RAW channel that is available: >
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417 let output = ch_readraw(channel)
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418 To read the error output: >
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419 let output = ch_readraw(channel, {"part": "err"})
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420
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421 ch_read() and ch_readraw() use the channel timeout. When there is nothing to
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422 read within that time an empty string is returned. To specify a different
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423 timeout in msec use the "timeout" option:
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424 {"timeout": 123} ~
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425 To read from the error output use the "part" option:
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426 {"part": "err"} ~
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427 To read a message with a specific ID, on a JS or JSON channel:
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428 {"id": 99} ~
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429 When no ID is specified or the ID is -1, the first message is returned. This
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430 overrules any callback waiting for this message.
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431
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432 For a RAW channel this returns whatever is available, since Vim does not know
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433 where a message ends.
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434 For a NL channel this returns one message.
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435 For a JS or JSON channel this returns one decoded message.
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436 This includes any sequence number.
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437
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438 ==============================================================================
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439 8. Starting a job with a channel *job-start* *job*
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440
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441 To start a job and open a channel for stdin/stdout/stderr: >
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442 let job = job_start(command, {options})
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443
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444 You can get the channel with: >
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445 let channel = job_getchannel(job)
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446
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447 The channel will use NL mode. If you want another mode it's best to specify
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448 this in {options}. When changing the mode later some text may have already
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449 been received and not parsed correctly.
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450
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451 If the command produces a line of output that you want to deal with, specify
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452 a handler for stdout: >
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453 let job = job_start(command, {"out_cb": "MyHandler"})
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454 The function will be called with the channel and a message. You would define
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455 it like this: >
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456 func MyHandler(channel, msg)
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457
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458 Without the handler you need to read the output with |ch_read()| or
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459 |ch_readraw()|. You can do this in the close callback, see |read-in-close-cb|.
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460
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461 The handler defined for "out_cb" will not receive stderr. If you want to
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462 handle that separately, add an "err_cb" handler: >
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463 let job = job_start(command, {"out_cb": "MyHandler",
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464 \ "err_cb": "ErrHandler"})
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465
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466 If you want to handle both stderr and stdout with one handler use the
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467 "callback" option: >
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468 let job = job_start(command, {"callback": "MyHandler"})
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469
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470 You can send a message to the command with ch_evalraw(). If the channel is in
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471 JSON or JS mode you can use ch_evalexpr().
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472
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473 There are several options you can use, see |job-options|.
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474 For example, to start a job and write its output in buffer "dummy": >
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475 let logjob = job_start("tail -f /tmp/log",
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476 \ {'out_io': 'buffer', 'out_name': 'dummy'})
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477 sbuf dummy
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478
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479
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480 Job input from a buffer ~
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481
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482 To run a job that reads from a buffer: >
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483 let job = job_start({command},
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484 \ {'in_io': 'buffer', 'in_name': 'mybuffer'})
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485 <
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486 *E915* *E918*
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487 The buffer is found by name, similar to |bufnr()|. The buffer must exist and
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488 be loaded when job_start() is called.
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489
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490 By default this reads the whole buffer. This can be changed with the "in_top"
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491 and "in_bot" options.
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492
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493 A special mode is when "in_top" is set to zero and "in_bot" is not set: Every
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494 time a line is added to the buffer, the last-but-one line will be send to the
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495 job stdin. This allows for editing the last line and sending it when pressing
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496 Enter.
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497
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498
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499 Reading job output in the close callback ~
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500 *read-in-close-cb*
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501 If the job can take some time and you don't need intermediate results, you can
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502 add a close callback and read the output there: >
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503
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504 func! CloseHandler(channel)
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505 while ch_status(a:channel) == 'buffered'
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506 echomsg ch_read(a:channel)
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507 endwhile
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508 endfunc
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509 let job = job_start(command, {'close_cb': 'CloseHandler'})
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510
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511 You will want to do something more useful than "echomsg".
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512
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513 ==============================================================================
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514 9. Starting a job without a channel *job-start-nochannel*
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515
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516 To start another process without creating a channel: >
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517 let job = job_start(command,
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518 \ {"in_io": "null", "out_io": "null", "err_io": "null"})
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519
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520 This starts {command} in the background, Vim does not wait for it to finish.
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521
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522 When Vim sees that neither stdin, stdout or stderr are connected, no channel
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523 will be created. Often you will want to include redirection in the command to
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524 avoid it getting stuck.
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525
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526 There are several options you can use, see |job-options|.
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527
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528 *job-start-if-needed*
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529 To start a job only when connecting to an address does not work, do something
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530 like this: >
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531 let channel = ch_open(address, {"waittime": 0})
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532 if ch_status(channel) == "fail"
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533 let job = job_start(command)
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534 let channel = ch_open(address, {"waittime": 1000})
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535 endif
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536
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537 Note that the waittime for ch_open() gives the job one second to make the port
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538 available.
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539
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540 ==============================================================================
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541 10. Job options *job-options*
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542
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543 The {options} argument in job_start() is a dictionary. All entries are
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544 optional. Some options can be used after the job has started, using
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545 job_setoptions(job, {options}). Many options can be used with the channel
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546 related to the job, using ch_setoptions(channel, {options}).
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547 See |job_setoptions()| and |ch_setoptions()|.
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548
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549 *in_mode* *out_mode* *err_mode*
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550 "in_mode" mode specifically for stdin, only when using pipes
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551 "out_mode" mode specifically for stdout, only when using pipes
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552 "err_mode" mode specifically for stderr, only when using pipes
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553 See |channel-mode| for the values.
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554
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555 Note: when setting "mode" the part specific mode is
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556 overwritten. Therefore set "mode" first and the part
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557 specific mode later.
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558
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559 Note: when writing to a file or buffer and when
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560 reading from a buffer NL mode is used by default.
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561
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562 *job-callback*
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563 "callback": handler Callback for something to read on any part of the
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564 channel.
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565 *job-out_cb* *out_cb*
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566 "out_cb": handler Callback for when there is something to read on
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567 stdout. Only for when the channel uses pipes. When
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568 "out_cb" wasn't set the channel callback is used.
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569
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570 *job-err_cb* *err_cb*
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571 "err_cb": handler Callback for when there is something to read on
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572 stderr. Only for when the channel uses pipes. When
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573 "err_cb" wasn't set the channel callback is used.
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574 *job-close_cb*
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575 "close_cb": handler Callback for when the channel is closed. Same as
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576 "close_cb" on ch_open().
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diff changeset
577 *job-exit_cb*
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578 "exit_cb": handler Callback for when the job ends. The arguments are the
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579 job and the exit status.
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580 Vim checks about every 10 seconds for jobs that ended.
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581 The check also be triggered by calling |job_status()|,
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582 which may then invoke the exit_cb handler.
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583 Note that data can be buffered, callbacks may still be
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584 called after the process ends.
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585 *job-timeout*
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586 "timeout" The time to wait for a request when blocking, E.g.
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587 when using ch_evalexpr(). In milliseconds. The
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588 default is 2000 (2 seconds).
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589 *out_timeout* *err_timeout*
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590 "out_timeout" Timeout for stdout. Only when using pipes.
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591 "err_timeout" Timeout for stderr. Only when using pipes.
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592 Note: when setting "timeout" the part specific mode is
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593 overwritten. Therefore set "timeout" first and the
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594 part specific mode later.
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595
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596 *job-stoponexit*
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597 "stoponexit": {signal} Send {signal} to the job when Vim exits. See
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598 |job_stop()| for possible values.
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599 "stoponexit": "" Do not stop the job when Vim exits.
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600 The default is "term".
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601
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602 *job-term*
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603 "term": "open" Start a terminal and connect the job
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604 stdin/stdout/stderr to it.
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605 NOTE: Not implemented yet!
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606
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607 "channel": {channel} Use an existing channel instead of creating a new one.
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608 The parts of the channel that get used for the new job
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609 will be disconnected from what they were used before.
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610 If the channel was still use by another job this may
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611 cause I/O errors.
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612 Existing callbacks and other settings remain.
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613
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614 *job-in_io* *in_top* *in_bot* *in_name* *in_buf*
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615 "in_io": "null" disconnect stdin (read from /dev/null)
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616 "in_io": "pipe" stdin is connected to the channel (default)
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617 "in_io": "file" stdin reads from a file
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618 "in_io": "buffer" stdin reads from a buffer
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619 "in_top": number when using "buffer": first line to send (default: 1)
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620 "in_bot": number when using "buffer": last line to send (default: last)
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621 "in_name": "/path/file" the name of the file or buffer to read from
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622 "in_buf": number the number of the buffer to read from
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623
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624 *job-out_io* *out_name* *out_buf*
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625 "out_io": "null" disconnect stdout (goes to /dev/null)
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626 "out_io": "pipe" stdout is connected to the channel (default)
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627 "out_io": "file" stdout writes to a file
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628 "out_io": "buffer" stdout appends to a buffer (see below)
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629 "out_name": "/path/file" the name of the file or buffer to write to
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630 "out_buf": number the number of the buffer to write to
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631 "out_modifiable": 0 when writing to a buffer, 'modifiable' will be off
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632 (see below)
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633
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634 *job-err_io* *err_name* *err_buf*
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635 "err_io": "out" stderr messages to go to stdout
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636 "err_io": "null" disconnect stderr (goes to /dev/null)
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637 "err_io": "pipe" stderr is connected to the channel (default)
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638 "err_io": "file" stderr writes to a file
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639 "err_io": "buffer" stderr appends to a buffer (see below)
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640 "err_name": "/path/file" the name of the file or buffer to write to
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641 "err_buf": number the number of the buffer to write to
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642 "err_modifiable": 0 when writing to a buffer, 'modifiable' will be off
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643 (see below)
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644
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645 "block_write": number only for testing: pretend every other write to stdin
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646 will block
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647
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diff changeset
648
da01d5da2cfa commit https://github.com/vim/vim/commit/77cdfd10382e01cc51f4ba1a9177032351843151
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649 Writing to a buffer ~
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650
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651 When the out_io or err_io mode is "buffer" and there is a callback, the text
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652 is appended to the buffer before invoking the callback.
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parents: 8392
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653
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654 When a buffer is used both for input and output, the output lines are put
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655 above the last line, since the last line is what is written to the channel
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656 input. Otherwise lines are appended below the last line.
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657
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658 When using JS or JSON mode with "buffer", only messages with zero or negative
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659 ID will be added to the buffer, after decoding + encoding. Messages with a
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660 positive number will be handled by a callback, commands are handled as usual.
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661
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662 The name of the buffer is compared the full name of existing buffers. If
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663 there is a match that buffer is used. Otherwise a new buffer is created.
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664 Use an empty name to always create a new buffer. |ch_getbufnr()| can then be
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parents: 8285
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665 used to get the buffer number.
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parents: 8285
diff changeset
666
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667 For a new buffer 'buftype' is set to "nofile" and 'bufhidden' to "hide". If
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668 you prefer other settings, create the buffer first and pass the buffer number.
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669
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670 The "out_modifiable" and "err_modifiable" options can be used to set the
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671 'modifiable' option off, or write to a buffer that has 'modifiable' off. That
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parents: 9116
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672 means that lines will be appended to the buffer, but the user can't easily
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parents: 9116
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673 change the buffer.
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parents: 9116
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674
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parents: 9116
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675 When an existing buffer is to be written where 'modifiable' is off and the
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parents: 9116
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676 "out_modifiable" or "err_modifiable" options is not zero, an error is given
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parents: 9116
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677 and the buffer will not be written to.
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parents: 9116
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678
8267
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parents: 8246
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679 When the buffer written to is displayed in a window and the cursor is in the
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parents: 8246
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680 first column of the last line, the cursor will be moved to the newly added
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parents: 8246
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681 line and the window is scrolled up to show the cursor if needed.
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parents: 8246
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682
108d30ed34ba commit https://github.com/vim/vim/commit/187db50d0499aecf4cfd42fb4db0a1bebf61c8cd
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683 Undo is synced for every added line.
8061
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parents: 7992
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684
8497
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parents: 8440
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685
da01d5da2cfa commit https://github.com/vim/vim/commit/77cdfd10382e01cc51f4ba1a9177032351843151
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parents: 8440
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686 Writing to a file ~
8540
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687 *E920*
8497
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parents: 8440
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688 The file is created with permissions 600 (read-write for the user, not
da01d5da2cfa commit https://github.com/vim/vim/commit/77cdfd10382e01cc51f4ba1a9177032351843151
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parents: 8440
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689 accessible for others). Use |setfperm()| to change this.
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parents: 8440
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690
da01d5da2cfa commit https://github.com/vim/vim/commit/77cdfd10382e01cc51f4ba1a9177032351843151
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parents: 8440
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691 If the file already exists it is truncated.
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parents: 8440
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692
8061
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parents: 7992
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693 ==============================================================================
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parents: 7992
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694 11. Controlling a job *job-control*
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parents: 7992
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695
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parents: 7992
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696 To get the status of a job: >
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parents: 7992
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697 echo job_status(job)
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parents: 7992
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698
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parents: 7992
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699 To make a job stop running: >
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parents: 7992
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700 job_stop(job)
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parents: 7992
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701
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parents: 7992
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702 This is the normal way to end a job. On Unix it sends a SIGTERM to the job.
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parents: 7992
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703 It is possible to use other ways to stop the job, or even send arbitrary
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parents: 7992
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704 signals. E.g. to force a job to stop, "kill it": >
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parents: 7992
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705 job_stop(job, "kill")
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parents: 7992
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706
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parents: 7992
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707 For more options see |job_stop()|.
7788
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parents:
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708
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Christian Brabandt <cb@256bit.org>
parents:
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709
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parents:
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710 vim:tw=78:ts=8:ft=help:norl: