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annotate runtime/doc/channel.txt @ 7788:192ae655ac91 v7.4.1191

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commit https://github.com/vim/vim/commit/3b5f929b18492fec291d1ec95a91f54e5912c03b Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jan 28 22:37:01 2016 +0100 patch 7.4.1191 Problem: The channel feature isn't working yet. Solution: Add the connect(), disconnect(), sendexpr() and sendraw() functions. Add initial documentation. Add a demo server.
author Christian Brabandt <cb@256bit.org>
date Thu, 28 Jan 2016 22:45:04 +0100
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children 6b0891de44a9
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1 *channel.txt* For Vim version 7.4. Last change: 2016 Jan 28
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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. *socket-interface*
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14 Vim current supports up to 10 simultanious channels.
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15 The Netbeans interface also uses a channel. |netbeans|
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17 1. Demo |channel-demo|
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18 2. Opening a channel |channel-open|
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19 3. Using a JSON channel |channel-use|
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20 4. Vim commands |channel-commands|
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21 5. Using a raw channel |channel-use|
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22 6. Job control |job-control|
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24 {Vi does not have any of these features}
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25 {only available when compiled with the |+channel| feature}
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27 ==============================================================================
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28 1. Demo *channel-demo*
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30 This requires Python. The demo program can be found in
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31 $VIMRUNTIME/tools/demoserver.py
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32 Run it in one terminal. We will call this T1.
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34 Run Vim in another terminal. Connect to the demo server with: >
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35 let handle = connect('localhost:8765', 'json')
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37 In T1 you should see:
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38 === socket opened === ~
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40 You can now send a message to the server: >
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41 echo sendexpr(handle, 'hello!')
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43 The message is received in T1 and a response is sent back to Vim.
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44 You can see the raw messages in T1. What Vim sends is:
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45 [1,"hello!"] ~
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46 And the response is:
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47 [1,"got it"] ~
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48 The number will increase every time you send a message.
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50 The server can send a command to Vim. Type this on T1 (literally, including
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51 the quotes): >
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52 NOT IMPLEMENTED YET
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53 ["ex","echo 'hi there'"]
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54 And you should see the message in Vim.
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56 To handle asynchronous communication a callback needs to be used: >
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57 func MyHandler(handle, msg)
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58 echo "from the handler: " . a:msg
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59 endfunc
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60 call sendexpr(handle, 'hello!', "MyHandler")
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62 Instead of giving a callback with every send call, it can also be specified
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63 when opening the channel: >
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64 call disconnect(handle)
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65 let handle = connect('localhost:8765', 'json', "MyHandler")
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66 call sendexpr(handle, 'hello!', 0)
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68 ==============================================================================
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69 2. Opening a channel *channel-open*
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71 To open a channel:
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72 let handle = connect({address}, {mode}, {callback})
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74 {address} has the form "hostname:port". E.g., "localhost:8765".
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76 {mode} can be: *channel-mode*
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77 "json" - Use JSON, see below; most convenient way
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78 "raw" - Use raw messages
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80 *channel-callback*
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81 {callback} is a function that is called when a message is received that is not
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82 handled otherwise. It gets two arguments: the channel handle and the received
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83 message. Example: >
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84 func Handle(handle, msg)
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85 echo 'Received: ' . a:msg
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86 endfunc
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87 let handle = connect("localhost:8765", 'json', "Handle")
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89 When {mode} is "json" the "msg" argument is the body of the received message,
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90 converted to Vim types.
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91 When {mode} is "raw" the "msg" argument is the whole message as a string.
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93 When {mode} is "json" the {callback} is optional. When omitted it is only
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94 possible to receive a message after sending one.
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96 The handler can be added or changed later: >
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97 call sethandler(handle, {callback})
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98 When {callback} is empty (zero or an empty string) the handler is removed.
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99
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100 Once done with the channel, disconnect it like this: >
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101 call disconnect(handle)
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102
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103 ==============================================================================
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104 3. Using a JSON channel *channel-use*
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105
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106 If {mode} is "json" then a message can be sent synchronously like this: >
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107 let response = sendexpr(handle, {expr})
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108 This awaits a response from the other side.
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109
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110 To send a message, without handling a response: >
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111 call sendexpr(handle, {expr}, 0)
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112
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113 To send a message and letting the response handled by a specific function,
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114 asynchronously: >
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115 call sendexpr(handle, {expr}, {callback})
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116
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117 The {expr} is converted to JSON and wrapped in an array. An example of the
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118 message that the receiver will get when {expr} is the string "hello":
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119 [12,"hello"] ~
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120
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121 The format of the JSON sent is:
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122 [{number},{expr}]
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123
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124 In which {number} is different every time. It must be used in the response
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125 (if any):
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126
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127 [{number},{response}]
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128
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129 This way Vim knows which sent message matches with which received message and
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130 can call the right handler. Also when the messages arrive out of order.
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131
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132 The sender must always send valid JSON to Vim. Vim can check for the end of
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133 the message by parsing the JSON. It will only accept the message if the end
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134 was received.
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135
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136 When the process wants to send a message to Vim without first receiving a
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137 message, it must use the number zero:
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138 [0,{response}]
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139
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140 Then channel handler will then get {response} converted to Vim types. If the
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141 channel does not have a handler the message is dropped.
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142
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143 On read error or disconnect() the string "DETACH" is sent, if still possible.
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144 The channel will then be inactive.
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145
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146 ==============================================================================
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147 4. Vim commands *channel-commands*
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148
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149 NOT IMPLEMENTED YET
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150
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151 With a "json" channel the process can send commands to Vim that will be
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152 handled by Vim internally, it does not require a handler for the channel.
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153
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154 Possible commands are:
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155 ["ex", {Ex command}]
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156 ["normal", {Normal mode command}]
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157 ["eval", {number}, {expression}]
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158 ["expr", {expression}]
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159
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160 With all of these: Be careful what these commands do! You can easily
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161 interfere with what the user is doing. To avoid trouble use |mode()| to check
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162 that the editor is in the expected state. E.g., to send keys that must be
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163 inserted as text, not executed as a command: >
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164 ["ex","if mode() == 'i' | call feedkeys('ClassName') | endif"]
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165
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166 The "ex" command is executed as any Ex command. There is no response for
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167 completion or error. You could use functions in an |autoload| script.
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168 You can also invoke |feedkeys()| to insert anything.
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169
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170 The "normal" command is executed like with |:normal|.
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171
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172 The "eval" command will result in sending back the result of the expression:
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173 [{number}, {result}]
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174 Here {number} is the same as what was in the request.
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175
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176 The "expr" command is similar, but does not send back any response.
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177 Example:
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178 ["expr","setline('$', ['one', 'two', 'three'])"]
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180 ==============================================================================
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181 5. Using a raw channel *channel-raw*
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182
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183 If {mode} is "raw" then a message can be send like this: >
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184 let response = sendraw(handle, {string})
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185 The {string} is sent as-is. The response will be what can be read from the
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186 channel right away. Since Vim doesn't know how to recognize the end of the
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187 message you need to take care of it yourself.
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188
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189 To send a message, without expecting a response: >
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190 call sendraw(handle, {string}, 0)
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191 The process can send back a response, the channel handler will be called with
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192 it.
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193
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194 To send a message and letting the response handled by a specific function,
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195 asynchronously: >
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196 call sendraw(handle, {string}, {callback})
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197
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198 This {string} can also be JSON, use |jsonencode()| to create it and
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199 |jsondecode()| to handle a received JSON message.
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200
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201 ==============================================================================
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202 6. Job control *job-control*
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204 NOT IMPLEMENTED YET
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206 To start another process: >
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207 call startjob({command})
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209 This does not wait for {command} to exit.
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211 TODO:
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213 let handle = startjob({command}, 's') # uses stdin/stdout
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214 let handle = startjob({command}, '', {address}) # uses socket
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215 let handle = startjob({command}, 'd', {address}) # start if connect fails
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218 vim:tw=78:ts=8:ft=help:norl: