/documentation/docs/repl.html

http://github.com/jashkenas/coffee-script · HTML · 608 lines · 403 code · 205 blank · 0 comment · 0 complexity · 4d2b8f2ac77e3fe6d7ff3af448aed03f MD5 · raw file 

    

  1. <!DOCTYPE html>
    2. 

  2. 

  3. <html>
    4. 

  4. <head>
    5. 

  5.   <title>repl.coffee</title>
    6. 

  6.   <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    7. 

  7.   <meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
    8. 

  8.   <link rel="stylesheet" media="all" href="docco.css" />
    9. 

  9. </head>
    10. 

  10. <body>
    11. 

  11.   <div id="container">
    12. 

  12.     <div id="background"></div>
    13. 

  13.     
    14. 

  14.       <ul id="jump_to">
    15. 

  15.         <li>
    16. 

  16.           <a class="large" href="javascript:void(0);">Jump To &hellip;</a>
    17. 

  17.           <a class="small" href="javascript:void(0);">+</a>
    18. 

  18.           <div id="jump_wrapper">
    19. 

  19.           <div id="jump_page_wrapper">
    20. 

  20.             <div id="jump_page">
    21. 

  21.               
    22. 

  22.                 
    23. 

  23.                 <a class="source" href="browser.html">
    24. 

  24.                   browser.coffee
    25. 

  25.                 </a>
    26. 

  26.               
    27. 

  27.                 
    28. 

  28.                 <a class="source" href="cake.html">
    29. 

  29.                   cake.coffee
    30. 

  30.                 </a>
    31. 

  31.               
    32. 

  32.                 
    33. 

  33.                 <a class="source" href="coffee-script.html">
    34. 

  34.                   coffee-script.coffee
    35. 

  35.                 </a>
    36. 

  36.               
    37. 

  37.                 
    38. 

  38.                 <a class="source" href="command.html">
    39. 

  39.                   command.coffee
    40. 

  40.                 </a>
    41. 

  41.               
    42. 

  42.                 
    43. 

  43.                 <a class="source" href="grammar.html">
    44. 

  44.                   grammar.coffee
    45. 

  45.                 </a>
    46. 

  46.               
    47. 

  47.                 
    48. 

  48.                 <a class="source" href="helpers.html">
    49. 

  49.                   helpers.coffee
    50. 

  50.                 </a>
    51. 

  51.               
    52. 

  52.                 
    53. 

  53.                 <a class="source" href="index.html">
    54. 

  54.                   index.coffee
    55. 

  55.                 </a>
    56. 

  56.               
    57. 

  57.                 
    58. 

  58.                 <a class="source" href="lexer.html">
    59. 

  59.                   lexer.coffee
    60. 

  60.                 </a>
    61. 

  61.               
    62. 

  62.                 
    63. 

  63.                 <a class="source" href="nodes.html">
    64. 

  64.                   nodes.coffee
    65. 

  65.                 </a>
    66. 

  66.               
    67. 

  67.                 
    68. 

  68.                 <a class="source" href="optparse.html">
    69. 

  69.                   optparse.coffee
    70. 

  70.                 </a>
    71. 

  71.               
    72. 

  72.                 
    73. 

  73.                 <a class="source" href="register.html">
    74. 

  74.                   register.coffee
    75. 

  75.                 </a>
    76. 

  76.               
    77. 

  77.                 
    78. 

  78.                 <a class="source" href="repl.html">
    79. 

  79.                   repl.coffee
    80. 

  80.                 </a>
    81. 

  81.               
    82. 

  82.                 
    83. 

  83.                 <a class="source" href="rewriter.html">
    84. 

  84.                   rewriter.coffee
    85. 

  85.                 </a>
    86. 

  86.               
    87. 

  87.                 
    88. 

  88.                 <a class="source" href="scope.html">
    89. 

  89.                   scope.litcoffee
    90. 

  90.                 </a>
    91. 

  91.               
    92. 

  92.                 
    93. 

  93.                 <a class="source" href="sourcemap.html">
    94. 

  94.                   sourcemap.litcoffee
    95. 

  95.                 </a>
    96. 

  96.               
    97. 

  97.             </div>
    98. 

  98.           </div>
    99. 

  99.         </li>
    100. 

  100.       </ul>
    101. 

  101.     
    102. 

  102.     <ul class="sections">
    103. 

  103.         
    104. 

  104.           <li id="title">
    105. 

  105.               <div class="annotation">
    106. 

  106.                   <h1>repl.coffee</h1>
    107. 

  107.               </div>
    108. 

  108.           </li>
    109. 

  109.         
    110. 

  110.         
    111. 

  111.         
    112. 

  112.         <li id="section-1">
    113. 

  113.             <div class="annotation">
    114. 

  114.               
    115. 

  115.               <div class="pilwrap ">
    116. 

  116.                 <a class="pilcrow" href="#section-1">&#182;</a>
    117. 

  117.               </div>
    118. 

  118.               
    119. 

  119.             </div>
    120. 

  120.             
    121. 

  121.             <div class="content"><div class='highlight'><pre>fs = <span class="hljs-built_in">require</span> <span class="hljs-string">'fs'</span>
    122. 

  122. path = <span class="hljs-built_in">require</span> <span class="hljs-string">'path'</span>
    123. 

  123. vm = <span class="hljs-built_in">require</span> <span class="hljs-string">'vm'</span>
    124. 

  124. nodeREPL = <span class="hljs-built_in">require</span> <span class="hljs-string">'repl'</span>
    125. 

  125. CoffeeScript = <span class="hljs-built_in">require</span> <span class="hljs-string">'./coffee-script'</span>
    126. 

  126. {merge, updateSyntaxError} = <span class="hljs-built_in">require</span> <span class="hljs-string">'./helpers'</span>
    127. 

  127. 

  128. replDefaults =
    129. 

  129.   <span class="hljs-attribute">prompt</span>: <span class="hljs-string">'coffee&gt; '</span>,
    130. 

  130.   <span class="hljs-attribute">historyFile</span>: path.join process.env.HOME, <span class="hljs-string">'.coffee_history'</span> <span class="hljs-keyword">if</span> process.env.HOME
    131. 

  131.   <span class="hljs-attribute">historyMaxInputSize</span>: <span class="hljs-number">10240</span>
    132. 

  132.   <span class="hljs-attribute">eval</span>: <span class="hljs-function"><span class="hljs-params">(input, context, filename, cb)</span> -&gt;</span></pre></div></div>
    133. 

  133.             
    134. 

  134.         </li>
    135. 

  135.         
    136. 

  136.         
    137. 

  137.         <li id="section-2">
    138. 

  138.             <div class="annotation">
    139. 

  139.               
    140. 

  140.               <div class="pilwrap ">
    141. 

  141.                 <a class="pilcrow" href="#section-2">&#182;</a>
    142. 

  142.               </div>
    143. 

  143.               <p>XXX: multiline hack.</p>
    144. 

  144. 

  145.             </div>
    146. 

  146.             
    147. 

  147.             <div class="content"><div class='highlight'><pre>    input = input.replace <span class="hljs-regexp">/\uFF00/g</span>, <span class="hljs-string">'\n'</span></pre></div></div>
    148. 

  148.             
    149. 

  149.         </li>
    150. 

  150.         
    151. 

  151.         
    152. 

  152.         <li id="section-3">
    153. 

  153.             <div class="annotation">
    154. 

  154.               
    155. 

  155.               <div class="pilwrap ">
    156. 

  156.                 <a class="pilcrow" href="#section-3">&#182;</a>
    157. 

  157.               </div>
    158. 

  158.               <p>Node’s REPL sends the input ending with a newline and then wrapped in
    159. 

  159. parens. Unwrap all that.</p>
    160. 

  160. 

  161.             </div>
    162. 

  162.             
    163. 

  163.             <div class="content"><div class='highlight'><pre>    input = input.replace <span class="hljs-regexp">/^\(([\s\S]*)\n\)$/m</span>, <span class="hljs-string">'$1'</span></pre></div></div>
    164. 

  164.             
    165. 

  165.         </li>
    166. 

  166.         
    167. 

  167.         
    168. 

  168.         <li id="section-4">
    169. 

  169.             <div class="annotation">
    170. 

  170.               
    171. 

  171.               <div class="pilwrap ">
    172. 

  172.                 <a class="pilcrow" href="#section-4">&#182;</a>
    173. 

  173.               </div>
    174. 

  174.               <p>Require AST nodes to do some AST manipulation.</p>
    175. 

  175. 

  176.             </div>
    177. 

  177.             
    178. 

  178.             <div class="content"><div class='highlight'><pre>    {Block, Assign, Value, Literal} = <span class="hljs-built_in">require</span> <span class="hljs-string">'./nodes'</span>
    179. 

  179. 

  180.     <span class="hljs-keyword">try</span></pre></div></div>
    181. 

  181.             
    182. 

  182.         </li>
    183. 

  183.         
    184. 

  184.         
    185. 

  185.         <li id="section-5">
    186. 

  186.             <div class="annotation">
    187. 

  187.               
    188. 

  188.               <div class="pilwrap ">
    189. 

  189.                 <a class="pilcrow" href="#section-5">&#182;</a>
    190. 

  190.               </div>
    191. 

  191.               <p>Tokenize the clean input.</p>
    192. 

  192. 

  193.             </div>
    194. 

  194.             
    195. 

  195.             <div class="content"><div class='highlight'><pre>      tokens = CoffeeScript.tokens input</pre></div></div>
    196. 

  196.             
    197. 

  197.         </li>
    198. 

  198.         
    199. 

  199.         
    200. 

  200.         <li id="section-6">
    201. 

  201.             <div class="annotation">
    202. 

  202.               
    203. 

  203.               <div class="pilwrap ">
    204. 

  204.                 <a class="pilcrow" href="#section-6">&#182;</a>
    205. 

  205.               </div>
    206. 

  206.               <p>Collect referenced variable names just like in <code>CoffeeScript.compile</code>.</p>
    207. 

  207. 

  208.             </div>
    209. 

  209.             
    210. 

  210.             <div class="content"><div class='highlight'><pre>      referencedVars = (
    211. 

  211.         token[<span class="hljs-number">1</span>] <span class="hljs-keyword">for</span> token <span class="hljs-keyword">in</span> tokens <span class="hljs-keyword">when</span> token.variable
    212. 

  212.       )</pre></div></div>
    213. 

  213.             
    214. 

  214.         </li>
    215. 

  215.         
    216. 

  216.         
    217. 

  217.         <li id="section-7">
    218. 

  218.             <div class="annotation">
    219. 

  219.               
    220. 

  220.               <div class="pilwrap ">
    221. 

  221.                 <a class="pilcrow" href="#section-7">&#182;</a>
    222. 

  222.               </div>
    223. 

  223.               <p>Generate the AST of the tokens.</p>
    224. 

  224. 

  225.             </div>
    226. 

  226.             
    227. 

  227.             <div class="content"><div class='highlight'><pre>      ast = CoffeeScript.nodes tokens</pre></div></div>
    228. 

  228.             
    229. 

  229.         </li>
    230. 

  230.         
    231. 

  231.         
    232. 

  232.         <li id="section-8">
    233. 

  233.             <div class="annotation">
    234. 

  234.               
    235. 

  235.               <div class="pilwrap ">
    236. 

  236.                 <a class="pilcrow" href="#section-8">&#182;</a>
    237. 

  237.               </div>
    238. 

  238.               <p>Add assignment to <code>_</code> variable to force the input to be an expression.</p>
    239. 

  239. 

  240.             </div>
    241. 

  241.             
    242. 

  242.             <div class="content"><div class='highlight'><pre>      ast = <span class="hljs-keyword">new</span> Block [
    243. 

  243.         <span class="hljs-keyword">new</span> Assign (<span class="hljs-keyword">new</span> Value <span class="hljs-keyword">new</span> Literal <span class="hljs-string">'_'</span>), ast, <span class="hljs-string">'='</span>
    244. 

  244.       ]
    245. 

  245.       js = ast.compile {<span class="hljs-attribute">bare</span>: <span class="hljs-literal">yes</span>, <span class="hljs-attribute">locals</span>: Object.keys(context), referencedVars}
    246. 

  246.       cb <span class="hljs-literal">null</span>, runInContext js, context, filename
    247. 

  247.     <span class="hljs-keyword">catch</span> err</pre></div></div>
    248. 

  248.             
    249. 

  249.         </li>
    250. 

  250.         
    251. 

  251.         
    252. 

  252.         <li id="section-9">
    253. 

  253.             <div class="annotation">
    254. 

  254.               
    255. 

  255.               <div class="pilwrap ">
    256. 

  256.                 <a class="pilcrow" href="#section-9">&#182;</a>
    257. 

  257.               </div>
    258. 

  258.               <p>AST’s <code>compile</code> does not add source code information to syntax errors.</p>
    259. 

  259. 

  260.             </div>
    261. 

  261.             
    262. 

  262.             <div class="content"><div class='highlight'><pre>      updateSyntaxError err, input
    263. 

  263.       cb err
    264. 

  264. 

  265. <span class="hljs-function"><span class="hljs-title">runInContext</span> = <span class="hljs-params">(js, context, filename)</span> -&gt;</span>
    266. 

  266.   <span class="hljs-keyword">if</span> context <span class="hljs-keyword">is</span> <span class="hljs-built_in">global</span>
    267. 

  267.     vm.runInThisContext js, filename
    268. 

  268.   <span class="hljs-keyword">else</span>
    269. 

  269.     vm.runInContext js, context, filename
    270. 

  270. 

  271. <span class="hljs-function"><span class="hljs-title">addMultilineHandler</span> = <span class="hljs-params">(repl)</span> -&gt;</span>
    272. 

  272.   {rli, inputStream, outputStream} = repl</pre></div></div>
    273. 

  273.             
    274. 

  274.         </li>
    275. 

  275.         
    276. 

  276.         
    277. 

  277.         <li id="section-10">
    278. 

  278.             <div class="annotation">
    279. 

  279.               
    280. 

  280.               <div class="pilwrap ">
    281. 

  281.                 <a class="pilcrow" href="#section-10">&#182;</a>
    282. 

  282.               </div>
    283. 

  283.               <p>Node 0.11.12 changed API, prompt is now _prompt.</p>
    284. 

  284. 

  285.             </div>
    286. 

  286.             
    287. 

  287.             <div class="content"><div class='highlight'><pre>  origPrompt = repl._prompt ? repl.prompt
    288. 

  288. 

  289.   multiline =
    290. 

  290.     <span class="hljs-attribute">enabled</span>: <span class="hljs-literal">off</span>
    291. 

  291.     <span class="hljs-attribute">initialPrompt</span>: origPrompt.replace <span class="hljs-regexp">/^[^&gt; ]*/</span>, <span class="hljs-function"><span class="hljs-params">(x)</span> -&gt;</span> x.replace <span class="hljs-regexp">/./g</span>, <span class="hljs-string">'-'</span>
    292. 

  292.     <span class="hljs-attribute">prompt</span>: origPrompt.replace <span class="hljs-regexp">/^[^&gt; ]*&gt;?/</span>, <span class="hljs-function"><span class="hljs-params">(x)</span> -&gt;</span> x.replace <span class="hljs-regexp">/./g</span>, <span class="hljs-string">'.'</span>
    293. 

  293.     <span class="hljs-attribute">buffer</span>: <span class="hljs-string">''</span></pre></div></div>
    294. 

  294.             
    295. 

  295.         </li>
    296. 

  296.         
    297. 

  297.         
    298. 

  298.         <li id="section-11">
    299. 

  299.             <div class="annotation">
    300. 

  300.               
    301. 

  301.               <div class="pilwrap ">
    302. 

  302.                 <a class="pilcrow" href="#section-11">&#182;</a>
    303. 

  303.               </div>
    304. 

  304.               <p>Proxy node’s line listener</p>
    305. 

  305. 

  306.             </div>
    307. 

  307.             
    308. 

  308.             <div class="content"><div class='highlight'><pre>  nodeLineListener = rli.listeners(<span class="hljs-string">'line'</span>)[<span class="hljs-number">0</span>]
    309. 

  309.   rli.removeListener <span class="hljs-string">'line'</span>, nodeLineListener
    310. 

  310.   rli.<span class="hljs-literal">on</span> <span class="hljs-string">'line'</span>, <span class="hljs-function"><span class="hljs-params">(cmd)</span> -&gt;</span>
    311. 

  311.     <span class="hljs-keyword">if</span> multiline.enabled
    312. 

  312.       multiline.buffer += <span class="hljs-string">"<span class="hljs-subst">#{cmd}</span>\n"</span>
    313. 

  313.       rli.setPrompt multiline.prompt
    314. 

  314.       rli.prompt <span class="hljs-literal">true</span>
    315. 

  315.     <span class="hljs-keyword">else</span>
    316. 

  316.       rli.setPrompt origPrompt
    317. 

  317.       nodeLineListener cmd
    318. 

  318.     <span class="hljs-keyword">return</span></pre></div></div>
    319. 

  319.             
    320. 

  320.         </li>
    321. 

  321.         
    322. 

  322.         
    323. 

  323.         <li id="section-12">
    324. 

  324.             <div class="annotation">
    325. 

  325.               
    326. 

  326.               <div class="pilwrap ">
    327. 

  327.                 <a class="pilcrow" href="#section-12">&#182;</a>
    328. 

  328.               </div>
    329. 

  329.               <p>Handle Ctrl-v</p>
    330. 

  330. 

  331.             </div>
    332. 

  332.             
    333. 

  333.             <div class="content"><div class='highlight'><pre>  inputStream.<span class="hljs-literal">on</span> <span class="hljs-string">'keypress'</span>, <span class="hljs-function"><span class="hljs-params">(char, key)</span> -&gt;</span>
    334. 

  334.     <span class="hljs-keyword">return</span> <span class="hljs-keyword">unless</span> key <span class="hljs-keyword">and</span> key.ctrl <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> key.meta <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> key.shift <span class="hljs-keyword">and</span> key.name <span class="hljs-keyword">is</span> <span class="hljs-string">'v'</span>
    335. 

  335.     <span class="hljs-keyword">if</span> multiline.enabled</pre></div></div>
    336. 

  336.             
    337. 

  337.         </li>
    338. 

  338.         
    339. 

  339.         
    340. 

  340.         <li id="section-13">
    341. 

  341.             <div class="annotation">
    342. 

  342.               
    343. 

  343.               <div class="pilwrap ">
    344. 

  344.                 <a class="pilcrow" href="#section-13">&#182;</a>
    345. 

  345.               </div>
    346. 

  346.               <p>allow arbitrarily switching between modes any time before multiple lines are entered</p>
    347. 

  347. 

  348.             </div>
    349. 

  349.             
    350. 

  350.             <div class="content"><div class='highlight'><pre>      <span class="hljs-keyword">unless</span> multiline.buffer.match <span class="hljs-regexp">/\n/</span>
    351. 

  351.         multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
    352. 

  352.         rli.setPrompt origPrompt
    353. 

  353.         rli.prompt <span class="hljs-literal">true</span>
    354. 

  354.         <span class="hljs-keyword">return</span></pre></div></div>
    355. 

  355.             
    356. 

  356.         </li>
    357. 

  357.         
    358. 

  358.         
    359. 

  359.         <li id="section-14">
    360. 

  360.             <div class="annotation">
    361. 

  361.               
    362. 

  362.               <div class="pilwrap ">
    363. 

  363.                 <a class="pilcrow" href="#section-14">&#182;</a>
    364. 

  364.               </div>
    365. 

  365.               <p>no-op unless the current line is empty</p>
    366. 

  366. 

  367.             </div>
    368. 

  368.             
    369. 

  369.             <div class="content"><div class='highlight'><pre>      <span class="hljs-keyword">return</span> <span class="hljs-keyword">if</span> rli.line? <span class="hljs-keyword">and</span> <span class="hljs-keyword">not</span> rli.line.match <span class="hljs-regexp">/^\s*$/</span></pre></div></div>
    370. 

  370.             
    371. 

  371.         </li>
    372. 

  372.         
    373. 

  373.         
    374. 

  374.         <li id="section-15">
    375. 

  375.             <div class="annotation">
    376. 

  376.               
    377. 

  377.               <div class="pilwrap ">
    378. 

  378.                 <a class="pilcrow" href="#section-15">&#182;</a>
    379. 

  379.               </div>
    380. 

  380.               <p>eval, print, loop</p>
    381. 

  381. 

  382.             </div>
    383. 

  383.             
    384. 

  384.             <div class="content"><div class='highlight'><pre>      multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
    385. 

  385.       rli.line = <span class="hljs-string">''</span>
    386. 

  386.       rli.cursor = <span class="hljs-number">0</span>
    387. 

  387.       rli.output.cursorTo <span class="hljs-number">0</span>
    388. 

  388.       rli.output.clearLine <span class="hljs-number">1</span></pre></div></div>
    389. 

  389.             
    390. 

  390.         </li>
    391. 

  391.         
    392. 

  392.         
    393. 

  393.         <li id="section-16">
    394. 

  394.             <div class="annotation">
    395. 

  395.               
    396. 

  396.               <div class="pilwrap ">
    397. 

  397.                 <a class="pilcrow" href="#section-16">&#182;</a>
    398. 

  398.               </div>
    399. 

  399.               <p>XXX: multiline hack</p>
    400. 

  400. 

  401.             </div>
    402. 

  402.             
    403. 

  403.             <div class="content"><div class='highlight'><pre>      multiline.buffer = multiline.buffer.replace <span class="hljs-regexp">/\n/g</span>, <span class="hljs-string">'\uFF00'</span>
    404. 

  404.       rli.emit <span class="hljs-string">'line'</span>, multiline.buffer
    405. 

  405.       multiline.buffer = <span class="hljs-string">''</span>
    406. 

  406.     <span class="hljs-keyword">else</span>
    407. 

  407.       multiline.enabled = <span class="hljs-keyword">not</span> multiline.enabled
    408. 

  408.       rli.setPrompt multiline.initialPrompt
    409. 

  409.       rli.prompt <span class="hljs-literal">true</span>
    410. 

  410.     <span class="hljs-keyword">return</span></pre></div></div>
    411. 

  411.             
    412. 

  412.         </li>
    413. 

  413.         
    414. 

  414.         
    415. 

  415.         <li id="section-17">
    416. 

  416.             <div class="annotation">
    417. 

  417.               
    418. 

  418.               <div class="pilwrap ">
    419. 

  419.                 <a class="pilcrow" href="#section-17">&#182;</a>
    420. 

  420.               </div>
    421. 

  421.               <p>Store and load command history from a file</p>
    422. 

  422. 

  423.             </div>
    424. 

  424.             
    425. 

  425.             <div class="content"><div class='highlight'><pre><span class="hljs-function"><span class="hljs-title">addHistory</span> = <span class="hljs-params">(repl, filename, maxSize)</span> -&gt;</span>
    426. 

  426.   lastLine = <span class="hljs-literal">null</span>
    427. 

  427.   <span class="hljs-keyword">try</span></pre></div></div>
    428. 

  428.             
    429. 

  429.         </li>
    430. 

  430.         
    431. 

  431.         
    432. 

  432.         <li id="section-18">
    433. 

  433.             <div class="annotation">
    434. 

  434.               
    435. 

  435.               <div class="pilwrap ">
    436. 

  436.                 <a class="pilcrow" href="#section-18">&#182;</a>
    437. 

  437.               </div>
    438. 

  438.               <p>Get file info and at most maxSize of command history</p>
    439. 

  439. 

  440.             </div>
    441. 

  441.             
    442. 

  442.             <div class="content"><div class='highlight'><pre>    stat = fs.statSync filename
    443. 

  443.     size = Math.min maxSize, stat.size</pre></div></div>
    444. 

  444.             
    445. 

  445.         </li>
    446. 

  446.         
    447. 

  447.         
    448. 

  448.         <li id="section-19">
    449. 

  449.             <div class="annotation">
    450. 

  450.               
    451. 

  451.               <div class="pilwrap ">
    452. 

  452.                 <a class="pilcrow" href="#section-19">&#182;</a>
    453. 

  453.               </div>
    454. 

  454.               <p>Read last <code>size</code> bytes from the file</p>
    455. 

  455. 

  456.             </div>
    457. 

  457.             
    458. 

  458.             <div class="content"><div class='highlight'><pre>    readFd = fs.openSync filename, <span class="hljs-string">'r'</span>
    459. 

  459.     buffer = <span class="hljs-keyword">new</span> Buffer(size)
    460. 

  460.     fs.readSync readFd, buffer, <span class="hljs-number">0</span>, size, stat.size - size
    461. 

  461.     fs.close readFd</pre></div></div>
    462. 

  462.             
    463. 

  463.         </li>
    464. 

  464.         
    465. 

  465.         
    466. 

  466.         <li id="section-20">
    467. 

  467.             <div class="annotation">
    468. 

  468.               
    469. 

  469.               <div class="pilwrap ">
    470. 

  470.                 <a class="pilcrow" href="#section-20">&#182;</a>
    471. 

  471.               </div>
    472. 

  472.               <p>Set the history on the interpreter</p>
    473. 

  473. 

  474.             </div>
    475. 

  475.             
    476. 

  476.             <div class="content"><div class='highlight'><pre>    repl.rli.history = buffer.toString().split(<span class="hljs-string">'\n'</span>).reverse()</pre></div></div>
    477. 

  477.             
    478. 

  478.         </li>
    479. 

  479.         
    480. 

  480.         
    481. 

  481.         <li id="section-21">
    482. 

  482.             <div class="annotation">
    483. 

  483.               
    484. 

  484.               <div class="pilwrap ">
    485. 

  485.                 <a class="pilcrow" href="#section-21">&#182;</a>
    486. 

  486.               </div>
    487. 

  487.               <p>If the history file was truncated we should pop off a potential partial line</p>
    488. 

  488. 

  489.             </div>
    490. 

  490.             
    491. 

  491.             <div class="content"><div class='highlight'><pre>    repl.rli.history.pop() <span class="hljs-keyword">if</span> stat.size &gt; maxSize</pre></div></div>
    492. 

  492.             
    493. 

  493.         </li>
    494. 

  494.         
    495. 

  495.         
    496. 

  496.         <li id="section-22">
    497. 

  497.             <div class="annotation">
    498. 

  498.               
    499. 

  499.               <div class="pilwrap ">
    500. 

  500.                 <a class="pilcrow" href="#section-22">&#182;</a>
    501. 

  501.               </div>
    502. 

  502.               <p>Shift off the final blank newline</p>
    503. 

  503. 

  504.             </div>
    505. 

  505.             
    506. 

  506.             <div class="content"><div class='highlight'><pre>    repl.rli.history.shift() <span class="hljs-keyword">if</span> repl.rli.history[<span class="hljs-number">0</span>] <span class="hljs-keyword">is</span> <span class="hljs-string">''</span>
    507. 

  507.     repl.rli.historyIndex = -<span class="hljs-number">1</span>
    508. 

  508.     lastLine = repl.rli.history[<span class="hljs-number">0</span>]
    509. 

  509. 

  510.   fd = fs.openSync filename, <span class="hljs-string">'a'</span>
    511. 

  511. 

  512.   repl.rli.addListener <span class="hljs-string">'line'</span>, <span class="hljs-function"><span class="hljs-params">(code)</span> -&gt;</span>
    513. 

  513.     <span class="hljs-keyword">if</span> code <span class="hljs-keyword">and</span> code.length <span class="hljs-keyword">and</span> code <span class="hljs-keyword">isnt</span> <span class="hljs-string">'.history'</span> <span class="hljs-keyword">and</span> lastLine <span class="hljs-keyword">isnt</span> code</pre></div></div>
    514. 

  514.             
    515. 

  515.         </li>
    516. 

  516.         
    517. 

  517.         
    518. 

  518.         <li id="section-23">
    519. 

  519.             <div class="annotation">
    520. 

  520.               
    521. 

  521.               <div class="pilwrap ">
    522. 

  522.                 <a class="pilcrow" href="#section-23">&#182;</a>
    523. 

  523.               </div>
    524. 

  524.               <p>Save the latest command in the file</p>
    525. 

  525. 

  526.             </div>
    527. 

  527.             
    528. 

  528.             <div class="content"><div class='highlight'><pre>      fs.write fd, <span class="hljs-string">"<span class="hljs-subst">#{code}</span>\n"</span>
    529. 

  529.       lastLine = code
    530. 

  530. 

  531.   repl.<span class="hljs-literal">on</span> <span class="hljs-string">'exit'</span>,<span class="hljs-function"> -&gt;</span> fs.close fd</pre></div></div>
    532. 

  532.             
    533. 

  533.         </li>
    534. 

  534.         
    535. 

  535.         
    536. 

  536.         <li id="section-24">
    537. 

  537.             <div class="annotation">
    538. 

  538.               
    539. 

  539.               <div class="pilwrap ">
    540. 

  540.                 <a class="pilcrow" href="#section-24">&#182;</a>
    541. 

  541.               </div>
    542. 

  542.               <p>Add a command to show the history stack</p>
    543. 

  543. 

  544.             </div>
    545. 

  545.             
    546. 

  546.             <div class="content"><div class='highlight'><pre>  repl.commands[getCommandId(repl, <span class="hljs-string">'history'</span>)] =
    547. 

  547.     <span class="hljs-attribute">help</span>: <span class="hljs-string">'Show command history'</span>
    548. 

  548.     <span class="hljs-attribute">action</span>:<span class="hljs-function"> -&gt;</span>
    549. 

  549.       repl.outputStream.write <span class="hljs-string">"<span class="hljs-subst">#{repl.rli.history[..].reverse().join <span class="hljs-string">'\n'</span>}</span>\n"</span>
    550. 

  550.       repl.displayPrompt()
    551. 

  551. 

  552. <span class="hljs-function"><span class="hljs-title">getCommandId</span> = <span class="hljs-params">(repl, commandName)</span> -&gt;</span></pre></div></div>
    553. 

  553.             
    554. 

  554.         </li>
    555. 

  555.         
    556. 

  556.         
    557. 

  557.         <li id="section-25">
    558. 

  558.             <div class="annotation">
    559. 

  559.               
    560. 

  560.               <div class="pilwrap ">
    561. 

  561.                 <a class="pilcrow" href="#section-25">&#182;</a>
    562. 

  562.               </div>
    563. 

  563.               <p>Node 0.11 changed API, a command such as ‘.help’ is now stored as ‘help’</p>
    564. 

  564. 

  565.             </div>
    566. 

  566.             
    567. 

  567.             <div class="content"><div class='highlight'><pre>  commandsHaveLeadingDot = repl.commands[<span class="hljs-string">'.help'</span>]?
    568. 

  568.   <span class="hljs-keyword">if</span> commandsHaveLeadingDot <span class="hljs-keyword">then</span> <span class="hljs-string">".<span class="hljs-subst">#{commandName}</span>"</span> <span class="hljs-keyword">else</span> commandName
    569. 

  569. 

  570. <span class="hljs-built_in">module</span>.<span class="hljs-built_in">exports</span> =
    571. 

  571.   <span class="hljs-attribute">start</span>: <span class="hljs-function"><span class="hljs-params">(opts = {})</span> -&gt;</span>
    572. 

  572.     [major, minor, build] = process.versions.node.split<span class="hljs-function"><span class="hljs-params">(<span class="hljs-string">'.'</span>)</span>.<span class="hljs-title">map</span> <span class="hljs-params">(n)</span> -&gt;</span> parseInt(n)
    573. 

  573. 

  574.     <span class="hljs-keyword">if</span> major <span class="hljs-keyword">is</span> <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> minor &lt; <span class="hljs-number">8</span>
    575. 

  575.       <span class="hljs-built_in">console</span>.warn <span class="hljs-string">"Node 0.8.0+ required for CoffeeScript REPL"</span>
    576. 

  576.       process.exit <span class="hljs-number">1</span>
    577. 

  577. 

  578.     CoffeeScript.register()
    579. 

  579.     process.argv = [<span class="hljs-string">'coffee'</span>].concat process.argv[<span class="hljs-number">2.</span>.]
    580. 

  580.     opts = merge replDefaults, opts
    581. 

  581.     repl = nodeREPL.start opts
    582. 

  582.     runInContext opts.prelude, repl.context, <span class="hljs-string">'prelude'</span> <span class="hljs-keyword">if</span> opts.prelude
    583. 

  583.     repl.<span class="hljs-literal">on</span> <span class="hljs-string">'exit'</span>,<span class="hljs-function"> -&gt;</span> repl.outputStream.write <span class="hljs-string">'\n'</span> <span class="hljs-keyword">if</span> <span class="hljs-keyword">not</span> repl.rli.closed
    584. 

  584.     addMultilineHandler repl
    585. 

  585.     addHistory repl, opts.historyFile, opts.historyMaxInputSize <span class="hljs-keyword">if</span> opts.historyFile</pre></div></div>
    586. 

  586.             
    587. 

  587.         </li>
    588. 

  588.         
    589. 

  589.         
    590. 

  590.         <li id="section-26">
    591. 

  591.             <div class="annotation">
    592. 

  592.               
    593. 

  593.               <div class="pilwrap ">
    594. 

  594.                 <a class="pilcrow" href="#section-26">&#182;</a>
    595. 

  595.               </div>
    596. 

  596.               <p>Adapt help inherited from the node REPL</p>
    597. 

  597. 

  598.             </div>
    599. 

  599.             
    600. 

  600.             <div class="content"><div class='highlight'><pre>    repl.commands[getCommandId(repl, <span class="hljs-string">'load'</span>)].help = <span class="hljs-string">'Load code from a file into this REPL session'</span>
    601. 

  601.     repl</pre></div></div>
    602. 

  602.             
    603. 

  603.         </li>
    604. 

  604.         
    605. 

  605.     </ul>
    606. 

  606.   </div>
    607. 

  607. </body>
    608. 

  608. </html>
    609.