First Commit

html/sternwarte/checkfuehrung/node_modules/cardinal/examples/highlight-diff.js

@@ -0,0 +1,90 @@
+'use strict'
+
+var fs          =  require('fs')
+var path        =  require('path')
+var highlighter =  require('..')
+var colors      =  require('ansicolors')
+var diffFile    =  path.join(__dirname, 'git-diff.txt')
+var diff        =  fs.readFileSync(diffFile, 'utf-8')
+
+// @@ is not a valid js token, so when we see it, we can be sure that we are dealing with a git or svn diff
+var diffRegex = /^@@[^@]+@@$/m
+var diffIndRegex = /^(@@[^@]+@@)(.*)$/
+var addRemRegex = /^[+-]/
+var lines = diff.split('\n')
+
+function isDiff(lines) {
+  return !!lines
+    .filter(function(line) {
+      return diffRegex.test(line)
+    })
+    .length
+}
+
+diff = isDiff(lines)
+
+function tryHighlight(code) {
+  // TODO: need to remove symbols added to get valid code
+  //       this should be done by getting the splits instead of the actual code from the highlighter
+  //       now we can remove first / last one after highlighting completed
+  function tryAppending(appended, tryNext) {
+    try {
+       return highlighter.highlight(code + appended)
+    } catch (e) {
+      return tryNext(code)
+    }
+  }
+
+  function tryRemoveLeadingComma(tryNext) {
+    var success
+    try {
+       success = highlighter.highlight(code.replace(/^( +),(.+)$/, '$1 $2'))
+       return success
+    } catch (e) {
+      return tryNext(code)
+    }
+  }
+
+  function tryPlain() {
+    try {
+      return highlighter.highlight(code)
+    } catch (e) {
+      return tryCloseMustache()
+    }
+  }
+
+  function tryCloseMustache() { return tryAppending('}', tryCloseParen) }
+
+  function tryCloseParen() { return tryAppending('\\)', tryCloseMustacheParen) }
+
+  function tryCloseMustacheParen() { return tryAppending('})', tryRemovingCommas) }
+
+  function tryRemovingCommas() { return tryRemoveLeadingComma(giveUp) }
+
+  function giveUp() { return code }
+
+  return tryPlain()
+}
+
+function highlightDiffInd(line, matches) {
+  var highlighted = colors.brightBlue(matches[1])
+  var code = matches[2]
+  return code ? highlighted + tryHighlight(code) : highlighted
+}
+
+function colorsAddRemove(c) {
+  return addRemRegex.test(c) ? colors.yellow(c) : c
+}
+
+function highlightDiff(line) {
+  var diffIndMatches = diffIndRegex.exec(line)
+
+  return diffIndMatches
+    ? highlightDiffInd(line, diffIndMatches)
+    : colorsAddRemove(line[0]) + tryHighlight(line.slice(1))
+}
+
+var highlightFn = diff ? highlightDiff : tryHighlight
+var highlightedLines = lines.map(highlightFn)
+
+console.log(highlightedLines.join('\n'))