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 <a href="../../index.html">All files</a> / <a href="index.html">coa/lib</a> completion.js
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177</td><td class="line-coverage quiet">&nbsp;
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict';
&nbsp;
const constants = require('constants');
const fs = require('fs');
const path = require('path');
&nbsp;
const Q = require('q');
&nbsp;
const shell = require('./shell');
const escape = shell.escape;
const unescape = shell.unescape;
&nbsp;
/**
 * Most of the code adopted from the npm package shell completion code.
 * See https://github.com/isaacs/npm/blob/master/lib/completion.js
 *
 * @returns {COA.CoaObject}
 */
module.exports = function completion() {
 return this
 .title('Shell completion')
 .helpful()
 .arg()
 .name('raw')
 .title('Completion words')
 .arr()
 .end()
 .act((opts, args) =&gt; {
 if(process.platform === 'win32') {
 const e = new Error('shell completion not supported on windows');
 e.code = 'ENOTSUP';
 e.errno = constants.ENOTSUP;
 return this.reject(e);
 }
&nbsp;
 // if the COMP_* isn't in the env, then just dump the script
 if((process.env.COMP_CWORD == null)
 || (process.env.COMP_LINE == null)
 || (process.env.COMP_POINT == null)) {
 return dumpScript(this._cmd._name);
 }
&nbsp;
 console.error('COMP_LINE: %s', process.env.COMP_LINE);
 console.error('COMP_CWORD: %s', process.env.COMP_CWORD);
 console.error('COMP_POINT: %s', process.env.COMP_POINT);
 console.error('args: %j', args.raw);
&nbsp;
 // completion opts
 opts = getOpts(args.raw);
&nbsp;
 // cmd
 const parsed = this._cmd._parseCmd(opts.partialWords);
 return Q.when(complete(parsed.cmd, parsed.opts), (compls) =&gt; {
 console.error('filtered: %j', compls);
 return console.log(compls.map(escape).join('\n'));
 });
 });
};
&nbsp;
function dumpScript(name) {
 const defer = Q.defer();
&nbsp;
 fs.readFile(path.resolve(__dirname, 'completion.sh'), 'utf8', function(err, d) {
 if(err) return defer.reject(err);
 d = d.replace(/{{cmd}}/g, path.basename(name)).replace(/^\#\!.*?\n/, '');
&nbsp;
 process.stdout.on('error', onError);
 process.stdout.write(d, () =&gt; defer.resolve());
 });
&nbsp;
 return defer.promise;
&nbsp;
 function onError(err) {
 // Darwin is a real dick sometimes.
 //
 // This is necessary because the "source" or "." program in
 // bash on OS X closes its file argument before reading
 // from it, meaning that you get exactly 1 write, which will
 // work most of the time, and will always raise an EPIPE.
 //
 // Really, one should not be tossing away EPIPE errors, or any
 // errors, so casually. But, without this, `. &lt;(cmd completion)`
 // can never ever work on OS X.
 if(err.errno !== constants.EPIPE) return defer.reject(err);
 process.stdout.removeListener('error', onError);
 return defer.resolve();
 }
}
&nbsp;
function getOpts(argv) {
 // get the partial line and partial word, if the point isn't at the end
 // ie, tabbing at: cmd foo b|ar
 const line = process.env.COMP_LINE;
 const w = +process.env.COMP_CWORD;
 const point = +process.env.COMP_POINT;
 const words = argv.map(unescape);
 const word = words[w];
 const partialLine = line.substr(0, point);
 const partialWords = words.slice(0, w);
&nbsp;
 // figure out where in that last word the point is
 let partialWord = argv[w] || '';
 let i = partialWord.length;
 while(partialWord.substr(0, i) !== partialLine.substr(-1 * i) &amp;&amp; i &gt; 0) i--;
&nbsp;
 partialWord = unescape(partialWord.substr(0, i));
 partialWord &amp;&amp; partialWords.push(partialWord);
&nbsp;
 return {
 line,
 w,
 point,
 words,
 word,
 partialLine,
 partialWords,
 partialWord
 };
}
&nbsp;
function complete(cmd, opts) {
 let optWord, optPrefix,
 compls = [];
&nbsp;
 // Complete on cmds
 if(opts.partialWord.indexOf('-'))
 compls = Object.keys(cmd._cmdsByName);
 // Complete on required opts without '-' in last partial word
 // (if required not already specified)
 //
 // Commented out because of uselessness:
 // -b, --block suggest results in '-' on cmd line;
 // next completion suggest all options, because of '-'
 //.concat Object.keys(cmd._optsByKey).filter (v) -&gt; cmd._optsByKey[v]._req
 else {
 // complete on opt values: --opt=| case
 const m = opts.partialWord.match(/^(--\w[\w-_]*)=(.*)$/);
 if(m) {
 optWord = m[1];
 optPrefix = optWord + '=';
 } else
 // complete on opts
 // don't complete on opts in case of --opt=val completion
 // TODO: don't complete on opts in case of unknown arg after commands
 // TODO: complete only on opts with arr() or not already used
 // TODO: complete only on full opts?
 compls = Object.keys(cmd._optsByKey);
 }
&nbsp;
 // complete on opt values: next arg case
 opts.partialWords[opts.w - 1].indexOf('-') || (optWord = opts.partialWords[opts.w - 1]);
&nbsp;
 // complete on opt values: completion
 let opt;
 optWord
 &amp;&amp; (opt = cmd._optsByKey[optWord])
 &amp;&amp; !opt._flag
 &amp;&amp; opt._comp
 &amp;&amp; (compls = Q.join(compls,
 Q.when(opt._comp(opts),
 (c, o) =&gt; c.concat(o.map(v =&gt; (optPrefix || '') + v)))));
&nbsp;
 // TODO: complete on args values (context aware, custom completion?)
&nbsp;
 // custom completion on cmds
 cmd._comp &amp;&amp; (compls = Q.join(compls, Q.when(cmd._comp(opts)), (c, o) =&gt; c.concat(o)));
&nbsp;
 // TODO: context aware custom completion on cmds, opts and args
 // (can depend on already entered values, especially options)
&nbsp;
 return Q.when(compls, complitions =&gt; {
 console.error('partialWord: %s', opts.partialWord);
 console.error('compls: %j', complitions);
 return compls.filter((c) =&gt; c.indexOf(opts.partialWord) === 0);
 });
}
&nbsp;</pre></td></tr>
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