Reduce building of PureScript module map

Resolves #59 and resolves #60

1 files changed, 231 insertions, 0 deletions

diff --git a/src/PscIde.js b/src/PscIde.js
new file mode 100644
index 0000000..d99b639
--- /dev/null
+++ b/src/PscIde.js
@@ -0,0 +1,231 @@
+'use strict';
+
+const path = require('path');
+
+const Promise = require('bluebird');
+
+const fs = Promise.promisifyAll(require('fs'));
+
+const retryPromise = require('promise-retry');
+
+const spawn = require('cross-spawn');
+
+const colors = require('chalk');
+
+const debug = require('debug')('purs-loader');
+
+const dargs = require('./dargs');
+
+const Psc = require('./Psc');
+
+const PsModuleMap = require('./PsModuleMap');
+
+function connect(psModule) {
+  const options = psModule.options
+  const cache = psModule.cache
+
+  if (cache.ideServer) return Promise.resolve(psModule)
+
+  cache.ideServer = true
+
+  const connect_ = () => new Promise((resolve, reject) => {
+    const args = dargs(options.pscIdeArgs)
+
+    debug('attempting to connect to psc-ide-server', args)
+
+    const ideClient = spawn('psc-ide-client', args)
+
+    ideClient.stderr.on('data', data => {
+      debug(data.toString())
+      cache.ideServer = false
+      reject(true)
+    })
+    ideClient.stdout.once('data', data => {
+      debug(data.toString())
+      if (data.toString()[0] === '{') {
+        const res = JSON.parse(data.toString())
+        if (res.resultType === 'success') {
+          cache.ideServer = ideServer
+          resolve(psModule)
+        } else {
+          cache.ideServer = ideServer
+          reject(true)
+        }
+      } else {
+        cache.ideServer = false
+        reject(true)
+      }
+    })
+    ideClient.stdin.resume()
+    ideClient.stdin.write(JSON.stringify({ command: 'load' }))
+    ideClient.stdin.write('\n')
+  })
+
+  const args = dargs(Object.assign({
+    outputDirectory: options.output,
+  }, options.pscIdeArgs))
+
+  debug('attempting to start psc-ide-server', args)
+
+  const ideServer = cache.ideServer = spawn('psc-ide-server', [])
+  ideServer.stderr.on('data', data => {
+    debug(data.toString())
+  })
+
+  return retryPromise((retry, number) => {
+    return connect_().catch(error => {
+      if (!cache.ideServer && number === 9) {
+        debug(error)
+
+        console.log(
+          'failed to connect to or start psc-ide-server, ' +
+          'full compilation will occur on rebuild'
+        )
+
+        return Promise.resolve(psModule)
+      }
+
+      return retry(error)
+    })
+  }, {
+    retries: 9,
+    factor: 1,
+    minTimeout: 333,
+    maxTimeout: 333,
+  })
+}
+module.exports.connect = connect;
+
+function rebuild(psModule) {
+  const options = psModule.options
+  const cache = psModule.cache
+
+  debug('attempting rebuild with psc-ide-client %s', psModule.srcPath)
+
+  const request = (body) => new Promise((resolve, reject) => {
+    const args = dargs(options.pscIdeArgs)
+    const ideClient = spawn('psc-ide-client', args)
+
+    var stdout = ''
+    var stderr = ''
+
+    ideClient.stdout.on('data', data => {
+      stdout = stdout + data.toString()
+    })
+
+    ideClient.stderr.on('data', data => {
+      stderr = stderr + data.toString()
+    })
+
+    ideClient.on('close', code => {
+      if (code !== 0) {
+        const error = stderr === '' ? 'Failed to spawn psc-ide-client' : stderr
+        return reject(new Error(error))
+      }
+
+      let res = null
+
+      try {
+        res = JSON.parse(stdout.toString())
+        debug(res)
+      } catch (err) {
+        return reject(err)
+      }
+
+      if (res && !Array.isArray(res.result)) {
+        return res.resultType === 'success'
+               ? resolve(psModule)
+               : reject('psc-ide rebuild failed')
+      }
+
+      Promise.map(res.result, (item, i) => {
+        debug(item)
+        return formatIdeResult(item, options, i, res.result.length)
+      })
+      .then(compileMessages => {
+        if (res.resultType === 'error') {
+          if (res.result.some(item => item.errorCode === 'UnknownModule' || item.errorCode === 'UnknownName')) {
+            debug('unknown module, attempting full recompile')
+            return Psc.compile(psModule)
+              .then(() => PsModuleMap.makeMap(options.src).then(map => {
+                debug('rebuilt module map');
+                cache.psModuleMap = map;
+              }))
+              .then(() => request({ command: 'load' }))
+              .then(resolve)
+              .catch(() => reject('psc-ide rebuild failed'))
+          }
+          cache.errors = compileMessages.join('\n')
+          reject('psc-ide rebuild failed')
+        } else {
+          cache.warnings = compileMessages.join('\n')
+          resolve(psModule)
+        }
+      })
+    })
+
+    ideClient.stdin.write(JSON.stringify(body))
+    ideClient.stdin.write('\n')
+  })
+
+  return request({
+    command: 'rebuild',
+    params: {
+      file: psModule.srcPath,
+    }
+  })
+}
+module.exports.rebuild = rebuild;
+
+function formatIdeResult(result, options, index, length) {
+  const srcPath = path.relative(options.context, result.filename)
+  const pos = result.position
+  const fileAndPos = `${srcPath}:${pos.startLine}:${pos.startColumn}`
+  let numAndErr = `[${index+1}/${length} ${result.errorCode}]`
+  numAndErr = options.pscIdeColors ? colors.yellow(numAndErr) : numAndErr
+
+  return fs.readFileAsync(result.filename, 'utf8').then(source => {
+    const lines = source.split('\n').slice(pos.startLine - 1, pos.endLine)
+    const endsOnNewline = pos.endColumn === 1 && pos.startLine !== pos.endLine
+    const up = options.pscIdeColors ? colors.red('^') : '^'
+    const down = options.pscIdeColors ? colors.red('v') : 'v'
+    let trimmed = lines.slice(0)
+
+    if (endsOnNewline) {
+      lines.splice(lines.length - 1, 1)
+      pos.endLine = pos.endLine - 1
+      pos.endColumn = lines[lines.length - 1].length || 1
+    }
+
+    // strip newlines at the end
+    if (endsOnNewline) {
+      trimmed = lines.reverse().reduce((trimmed, line, i) => {
+        if (i === 0 && line === '') trimmed.trimming = true
+        if (!trimmed.trimming) trimmed.push(line)
+        if (trimmed.trimming && line !== '') {
+          trimmed.trimming = false
+          trimmed.push(line)
+        }
+        return trimmed
+      }, []).reverse()
+      pos.endLine = pos.endLine - (lines.length - trimmed.length)
+      pos.endColumn = trimmed[trimmed.length - 1].length || 1
+    }
+
+    const spaces = ' '.repeat(String(pos.endLine).length)
+    let snippet = trimmed.map((line, i) => {
+      return `  ${pos.startLine + i}  ${line}`
+    }).join('\n')
+
+    if (trimmed.length === 1) {
+      snippet += `\n  ${spaces}  ${' '.repeat(pos.startColumn - 1)}${up.repeat(pos.endColumn - pos.startColumn + 1)}`
+    } else {
+      snippet = `  ${spaces}  ${' '.repeat(pos.startColumn - 1)}${down}\n${snippet}`
+      snippet += `\n  ${spaces}  ${' '.repeat(pos.endColumn - 1)}${up}`
+    }
+
+    return Promise.resolve(
+      `\n${numAndErr} ${fileAndPos}\n\n${snippet}\n\n${result.message}`
+    )
+  })
+}