Mercurial > vim
annotate runtime/doc/channel.txt @ 8094:18a3f0f05244 v7.4.1341
commit https://github.com/vim/vim/commit/910b8aac5dc4693c4508b7acd2cef0bbfac04242
Author: Bram Moolenaar <Bram@vim.org>
Date: Tue Feb 16 21:03:07 2016 +0100
patch 7.4.1341
Problem: It's difficult to add more arguments to ch_sendraw() and
ch_sendexpr().
Solution: Make the third option a dictionary.
author | Christian Brabandt <cb@256bit.org> |
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date | Tue, 16 Feb 2016 21:15:05 +0100 |
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1 *channel.txt* For Vim version 7.4. Last change: 2016 Feb 16 |
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2 |
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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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14 |
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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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29 |
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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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33 |
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34 ============================================================================== |
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35 1. Overview *job-channel-overview* |
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36 |
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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-may-start| and |channel-open|. |
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48 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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50 |
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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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56 |
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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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62 |
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63 ============================================================================== |
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64 2. Channel demo *channel-demo* |
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65 |
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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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69 |
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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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72 |
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73 In T1 you should see: |
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74 === socket opened === ~ |
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75 |
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76 You can now send a message to the server: > |
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77 echo ch_sendexpr(channel, 'hello!') |
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78 |
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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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85 |
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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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91 |
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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!', "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!', 0) |
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105 |
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106 ============================================================================== |
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107 3. Opening a channel *channel-open* |
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108 |
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109 To open a channel: > |
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110 let channel = ch_open({address} [, {options}]) |
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111 |
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112 Use |ch_status()| to see if the channel could be opened. |
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113 |
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114 {address} has the form "hostname:port". E.g., "localhost:8765". |
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115 |
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116 {options} is a dictionary with optional entries: |
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117 |
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118 "mode" can be: *channel-mode* |
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119 "json" - Use JSON, see below; most convenient way. Default. |
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120 "js" - Use JS (JavaScript) encoding, more efficient than JSON. |
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121 "nl" - Use messages that end in a NL character |
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122 "raw" - Use raw messages |
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123 |
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124 *channel-callback* |
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125 "callback" A function that is called when a message is received that is |
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126 not handled otherwise. It gets two arguments: the channel |
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127 handle and the received message. Example: > |
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128 func Handle(channel, msg) |
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129 echo 'Received: ' . a:msg |
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130 endfunc |
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131 let channel = ch_open("localhost:8765", {"callback": "Handle"}) |
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132 < |
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133 TODO: |
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134 "err-cb" A function like "callback" but used for stderr. Only for when |
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135 the channel uses pipes. |
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136 |
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137 TODO: |
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138 "close-cb" A function that is called when the channel gets closed, other |
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139 than by calling ch_close(). It should be defined like this: > |
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140 func MyCloseHandler(channel) |
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141 |
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142 "waittime" The time to wait for the connection to be made in |
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143 milliseconds. The default is zero, don't wait, which is |
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144 useful if the server is supposed to be running already. A |
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145 negative number waits forever. |
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146 |
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147 "timeout" The time to wait for a request when blocking, using |
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148 ch_sendexpr(). Again in milliseconds. The default is 2000 (2 |
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149 seconds). |
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150 |
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151 When "mode" is "json" or "js" the "msg" argument is the body of the received |
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152 message, converted to Vim types. |
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153 When "mode" is "raw" the "msg" argument is the whole message as a string. |
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154 |
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155 When "mode" is "json" or "js" the "callback" is optional. When omitted it is |
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156 only possible to receive a message after sending one. |
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157 |
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158 TODO: |
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159 To change the channel options after opening it use ch_setoptions(). The |
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160 arguments are similar to what is passed to ch_open(), but "waittime" cannot be |
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161 given, since that only applies to opening the channel. |
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162 |
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163 The handler can be added or changed: > |
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164 call ch_setoptions(channel, {'callback': callback}) |
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165 When "callback" is empty (zero or an empty string) the handler is removed. |
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166 |
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167 The timeout can be changed: > |
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168 call ch_setoptions(channel, {'timeout': msec}) |
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169 < |
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170 *E906* |
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171 Once done with the channel, disconnect it like this: > |
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172 call ch_close(channel) |
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173 When a socket is used this will close the socket for both directions. When |
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174 pipes are used (stdin/stdout/stderr) they are all closed. This might not be |
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175 what you want! Stopping the job with job_stop() might be better. |
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176 |
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177 TODO: |
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178 Currently up to 10 channels can be in use at the same time. *E897* |
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179 |
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180 When the channel can't be opened you will get an error message. There is a |
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181 difference between MS-Windows and Unix: On Unix when the port doesn't exist |
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182 ch_open() fails quickly. On MS-Windows "waittime" applies. |
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183 *E898* *E899* *E900* *E901* *E902* |
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184 |
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185 If there is an error reading or writing a channel it will be closed. |
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186 *E896* *E630* *E631* |
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187 |
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188 ============================================================================== |
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189 4. Using a JSON or JS channel *channel-use* |
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190 |
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191 If mode is JSON then a message can be sent synchronously like this: > |
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192 let response = ch_sendexpr(channel, {expr}) |
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193 This awaits a response from the other side. |
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194 |
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195 When mode is JS this works the same, except that the messages use |
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196 JavaScript encoding. See |js_encode()| for the difference. |
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197 |
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198 To send a message, without handling a response: > |
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199 call ch_sendexpr(channel, {expr}, 0) |
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200 |
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201 To send a message and letting the response handled by a specific function, |
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202 asynchronously: > |
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203 call ch_sendexpr(channel, {expr}, {callback}) |
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204 |
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205 Vim will match the response with the request using the message ID. Once the |
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206 response is received the callback will be invoked. Further responses with the |
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207 same ID will be ignored. If your server sends back multiple responses you |
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208 need to send them with ID zero, they will be passed to the channel callback. |
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209 |
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210 The {expr} is converted to JSON and wrapped in an array. An example of the |
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211 message that the receiver will get when {expr} is the string "hello": |
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212 [12,"hello"] ~ |
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213 |
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214 The format of the JSON sent is: |
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215 [{number},{expr}] |
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216 |
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217 In which {number} is different every time. It must be used in the response |
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218 (if any): |
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219 |
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220 [{number},{response}] |
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221 |
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222 This way Vim knows which sent message matches with which received message and |
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223 can call the right handler. Also when the messages arrive out of order. |
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224 |
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225 The sender must always send valid JSON to Vim. Vim can check for the end of |
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226 the message by parsing the JSON. It will only accept the message if the end |
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227 was received. |
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228 |
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229 When the process wants to send a message to Vim without first receiving a |
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230 message, it must use the number zero: |
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231 [0,{response}] |
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232 |
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233 Then channel handler will then get {response} converted to Vim types. If the |
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234 channel does not have a handler the message is dropped. |
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235 |
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236 On read error or ch_close() the string "DETACH" is sent, if still possible. |
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237 The channel will then be inactive. |
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238 |
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239 It is also possible to use ch_sendraw() on a JSON or JS channel. The caller |
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240 is then completely responsible for correct encoding and decoding. |
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241 |
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242 ============================================================================== |
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243 5. Channel commands *channel-commands* |
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244 |
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245 With a JSON channel the process can send commands to Vim that will be |
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246 handled by Vim internally, it does not require a handler for the channel. |
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247 |
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248 Possible commands are: *E903* *E904* *E905* |
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249 ["redraw" {forced}] |
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250 ["ex", {Ex command}] |
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251 ["normal", {Normal mode command}] |
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252 ["eval", {expression}, {number}] |
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253 ["expr", {expression}] |
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254 |
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255 With all of these: Be careful what these commands do! You can easily |
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256 interfere with what the user is doing. To avoid trouble use |mode()| to check |
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257 that the editor is in the expected state. E.g., to send keys that must be |
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258 inserted as text, not executed as a command: |
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259 ["ex","if mode() == 'i' | call feedkeys('ClassName') | endif"] ~ |
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260 |
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261 Errors in these commands are normally not reported to avoid them messing up |
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262 the display. If you do want to see them, set the 'verbose' option to 3 or |
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263 higher. |
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264 |
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265 |
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266 Command "redraw" ~ |
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267 |
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268 The other commands do not update the screen, so that you can send a sequence |
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269 of commands without the cursor moving around. You must end with the "redraw" |
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270 command to show any changed text and show the cursor where it belongs. |
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271 |
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272 The argument is normally an empty string: |
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273 ["redraw", ""] ~ |
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274 To first clear the screen pass "force": |
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275 ["redraw", "force"] ~ |
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276 |
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277 |
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278 Command "ex" ~ |
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279 |
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280 The "ex" command is executed as any Ex command. There is no response for |
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281 completion or error. You could use functions in an |autoload| script: |
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282 ["ex","call myscript#MyFunc(arg)"] |
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283 |
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284 You can also use "call |feedkeys()|" to insert any key sequence. |
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285 |
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286 |
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287 Command "normal" ~ |
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288 |
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289 The "normal" command is executed like with ":normal!", commands are not |
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290 mapped. Example to open the folds under the cursor: |
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291 ["normal" "zO"] |
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292 |
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293 |
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294 Command "eval" ~ |
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295 |
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296 The "eval" command an be used to get the result of an expression. For |
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297 example, to get the number of lines in the current buffer: |
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298 ["eval","line('$')"] ~ |
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299 |
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300 it will send back the result of the expression: |
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301 [{number}, {result}] |
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302 Here {number} is the same as what was in the request. Use a negative number |
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303 to avoid confusion with message that Vim sends. |
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304 |
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305 {result} is the result of the evaluation and is JSON encoded. If the |
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306 evaluation fails or the result can't be encoded in JSON it is the string |
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307 "ERROR". |
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308 |
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309 |
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310 Command "expr" ~ |
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311 |
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312 The "expr" command is similar to "eval", but does not send back any response. |
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313 Example: |
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314 ["expr","setline('$', ['one', 'two', 'three'])"] ~ |
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315 |
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316 ============================================================================== |
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317 6. Using a RAW or NL channel *channel-raw* |
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318 |
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319 If mode is RAW or NL then a message can be send like this: > |
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320 let response = ch_sendraw(channel, {string}) |
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321 |
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322 The {string} is sent as-is. The response will be what can be read from the |
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323 channel right away. Since Vim doesn't know how to recognize the end of the |
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324 message you need to take care of it yourself. The timeout applies for reading |
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325 the first byte, after that it will not wait for anything more. |
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326 |
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327 If mode is "nl" you can send a message in a similar way. You are expected |
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328 to put in the NL after each message. Thus you can also send several messages |
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329 ending in a NL at once. The response will be the text up to and including the |
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330 first NL. This can also be just the NL for an empty response. |
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331 If no NL was read before the channel timeout an empty string is returned. |
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332 |
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333 To send a message, without expecting a response: > |
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334 call ch_sendraw(channel, {string}, 0) |
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335 The process can send back a response, the channel handler will be called with |
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336 it. |
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337 |
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338 To send a message and letting the response handled by a specific function, |
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339 asynchronously: > |
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340 call ch_sendraw(channel, {string}, {callback}) |
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341 |
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342 This {string} can also be JSON, use |json_encode()| to create it and |
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343 |json_decode()| to handle a received JSON message. |
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344 |
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345 It is not possible to use |ch_sendexpr()| on a raw channel. |
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346 |
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347 ============================================================================== |
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348 7. More channel functions *channel-more* |
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349 |
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350 To obtain the status of a channel: ch_status(channel). The possible results |
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351 are: |
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352 "fail" Failed to open the channel. |
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353 "open" The channel can be used. |
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354 "closed" The channel was closed. |
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355 |
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356 TODO: |
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357 To objain the job associated with a channel: ch_getjob(channel) |
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358 |
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359 TODO: |
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360 To read one message from a channel: > |
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361 let output = ch_read(channel) |
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362 This uses the channel timeout. To read without a timeout, just get any |
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363 message that is available: > |
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364 let output = ch_read(channel, 0) |
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365 When no message was available then the result is v:none for a JSON or JS mode |
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366 channels, an empty string for a RAW or NL channel. |
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367 |
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368 To read all output from a RAW or NL channel that is available: > |
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369 let output = ch_readall(channel) |
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370 To read the error output: > |
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371 let output = ch_readall(channel, "err") |
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372 TODO: use channel timeout, no timeout or specify timeout? |
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373 |
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374 ============================================================================== |
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375 8. Starting a job with a channel *job-start* *job* |
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376 |
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377 To start a job and open a channel for stdin/stdout/stderr: > |
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378 let job = job_start(command, {options}) |
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379 |
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380 You can get the channel with: > |
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381 let channel = job_getchannel(job) |
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382 |
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383 The channel will use NL mode. If you want another mode it's best to specify |
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384 this in {options}. When changing the mode later some text may have already |
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385 been received and not parsed correctly. |
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386 |
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387 If the command produces a line of output that you want to deal with, specify |
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388 a handler for stdout: > |
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389 let job = job_start(command, {"out-cb": "MyHandler"}) |
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390 The function will be called with the channel and a message. You would define |
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391 it like this: > |
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392 func MyHandler(channel, msg) |
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393 |
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394 Without the handler you need to read the output with ch_read(). |
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395 |
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396 The handler defined for "out-cb" will also receive stderr. If you want to |
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397 handle that separately, add an "err-cb" handler: > |
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398 let job = job_start(command, {"out-cb": "MyHandler", |
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399 \ "err-cb": "ErrHandler"}) |
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400 |
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401 You can send a message to the command with ch_sendraw(). If the channel is in |
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402 JSON or JS mode you can use ch_sendexpr(). |
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403 |
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404 There are several options you can use, see |job-options|. |
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405 |
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406 TODO: |
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407 To run a job and read its output once it is done: > |
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408 |
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409 let job = job_start({command}, {'exit-cb': 'MyHandler'}) |
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410 func MyHandler(job, status) |
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411 let channel = job_getchannel() |
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412 let output = ch_readall(channel) |
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413 " parse output |
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414 endfunc |
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415 |
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416 ============================================================================== |
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417 9. Starting a job without a channel *job-start-nochannel* |
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418 |
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419 To start another process without creating a channel: > |
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420 let job = job_start(command, {"in-io": "null", "out-io": "null"}) |
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421 |
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422 This starts {command} in the background, Vim does not wait for it to finish. |
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423 |
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424 TODO: |
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425 When Vim sees that neither stdin, stdout or stderr are connected, no channel |
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426 will be created. Often you will want to include redirection in the command to |
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427 avoid it getting stuck. |
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428 |
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429 There are several options you can use, see |job-options|. |
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430 |
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431 TODO: *job-may-start* |
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432 To start a job only when connecting to an address does not work use |
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433 job_maystart('command', {address}, {options}), For Example: > |
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434 let job = job_maystart(command, address, {"waittime": 1000}) |
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435 let channel = job_gethandle(job) |
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436 |
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437 This comes down to: > |
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438 let channel = ch_open(address, {"waittime": 0}) |
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439 if ch_status(channel) == "fail" |
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440 let job = job_start(command) |
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441 let channel = ch_open(address, {"waittime": 1000}) |
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442 call job_sethandle(channel) |
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443 endif |
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444 Note that the specified waittime applies to when the job has been started. |
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445 This gives the job some time to make the port available. |
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446 |
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447 ============================================================================== |
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448 10. Job options *job-options* |
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449 |
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450 The {options} argument in job_start() is a dictionary. All entries are |
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451 optional. The same options can be used with job_setoptions(job, {options}). |
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452 |
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453 TODO: *job-out-cb* |
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454 "callback": handler |
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455 "out-cb": handler Callback for when there is something to read on |
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456 stdout. |
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457 TODO: *job-err-cb* |
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458 "err-cb": handler Callback for when there is something to read on |
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459 stderr. Defaults to the same callback as "out-cb". |
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460 TODO: *job-close-cb* |
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461 "close-cb": handler Callback for when the channel is closed. Same as |
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462 "close-cb" on ch_open(). |
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463 TODO: *job-exit-cb* |
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464 "exit-cb": handler Callback for when the job ends. The arguments are the |
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465 job and the exit status. |
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466 TODO: *job-killonexit* |
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467 "killonexit": 1 Stop the job when Vim exits. |
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468 "killonexit": 0 Do not stop the job when Vim exits. |
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469 The default is 1. |
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470 TODO: *job-term* |
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471 "term": "open" Start a terminal and connect the job |
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472 stdin/stdout/stderr to it. |
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473 |
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474 TODO: *job-in-io* |
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475 "in-io": "null" disconnect stdin |
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476 "in-io": "pipe" stdin is connected to the channel (default) |
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477 "in-io": "file" stdin reads from a file |
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478 "in-file": "/path/file" the file to read from |
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479 |
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480 TODO: *job-out-io* |
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481 "out-io": "null" disconnect stdout |
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482 "out-io": "pipe" stdout is connected to the channel (default) |
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483 "out-io": "file" stdout writes to a file |
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484 "out-file": "/path/file" the file to write to |
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485 "out-io": "buffer" stdout appends to a buffer |
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486 "out-buffer": "name" buffer to append to |
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487 |
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488 TODO: *job-err-io* |
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489 "err-io": "out" same type as stdout (default) |
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490 "err-io": "null" disconnect stderr |
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491 "err-io": "pipe" stderr is connected to the channel |
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492 "err-io": "file" stderr writes to a file |
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493 "err-file": "/path/file" the file to write to |
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494 "err-io": "buffer" stderr appends to a buffer |
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495 "err-buffer": "name" buffer to append to |
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496 |
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497 TODO: more options |
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498 |
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499 |
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500 ============================================================================== |
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501 11. Controlling a job *job-control* |
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502 |
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503 To get the status of a job: > |
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504 echo job_status(job) |
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505 |
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506 To make a job stop running: > |
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507 job_stop(job) |
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508 |
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509 This is the normal way to end a job. On Unix it sends a SIGTERM to the job. |
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510 It is possible to use other ways to stop the job, or even send arbitrary |
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511 signals. E.g. to force a job to stop, "kill it": > |
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512 job_stop(job, "kill") |
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513 |
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514 For more options see |job_stop()|. |
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515 |
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516 |
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517 vim:tw=78:ts=8:ft=help:norl: |