common/scripts/diff2html.sh

   1 #!/bin/bash
   2 #
   3 # Convert diff output to colorized HTML.
   4 #
   5 # (http://www.linuxjournal.com/content/convert-diff-output-colorized-html)
   6
   7 cat <<XX
   8 <html>
   9 <head>
  10 <title>Colorized Diff</title>
  11 </head>
  12 <style>
  13 .diffdiv  { border: solid 1px black;           }
  14 .comment  { color: gray;                       }
  15 .diff     { color: #8A2BE2;                    }
  16 .minus3   { color: blue;                       }
  17 .plus3    { color: maroon;                     }
  18 .at2      { color: lime;                       }
  19 .plus     { color: green; background: #E7E7E7; }
  20 .minus    { color: red;   background: #D7D7D7; }
  21 .only     { color: purple;                     }
  22 </style>
  23 <body>
  24 <pre>
  25 XX
  26
  27 echo -n '<span class="comment">'
  28
  29 first=1
  30 diffseen=0
  31 lastonly=0
  32
  33 OIFS=$IFS
  34 IFS='
  35 '
  36
  37 # The -r option keeps the backslash from being an escape char.
  38 read -r s
  39
  40 while [[ $? -eq 0 ]]
  41 do
  42     # Get beginning of line to determine what type
  43     # of diff line it is.
  44     t1=${s:0:1}
  45     t2=${s:0:2}
  46     t3=${s:0:3}
  47     t4=${s:0:4}
  48     t7=${s:0:7}
  49
  50     # Determine HTML class to use.
  51     if    [[ "$t7" == 'Only in' ]]; then
  52         cls='only'
  53         if [[ $diffseen -eq 0 ]]; then
  54             diffseen=1
  55             echo -n '</span>'
  56         else
  57             if [[ $lastonly -eq 0 ]]; then
  58                 echo "</div>"
  59             fi
  60         fi
  61         if [[ $lastonly -eq 0 ]]; then
  62             echo "<div class='diffdiv'>"
  63         fi
  64         lastonly=1
  65     elif [[ "$t4" == 'diff' ]]; then
  66         cls='diff'
  67         if [[ $diffseen -eq 0 ]]; then
  68             diffseen=1
  69             echo -n '</span>'
  70         else
  71             echo "</div>"
  72         fi
  73         echo "<div class='diffdiv'>"
  74         lastonly=0
  75     elif  [[ "$t3" == '+++'  ]]; then
  76         cls='plus3'
  77         lastonly=0
  78     elif  [[ "$t3" == '---'  ]]; then
  79         cls='minus3'
  80         lastonly=0
  81     elif  [[ "$t2" == '@@'   ]]; then
  82         cls='at2'
  83         lastonly=0
  84     elif  [[ "$t1" == '+'    ]]; then
  85         cls='plus'
  86         lastonly=0
  87     elif  [[ "$t1" == '-'    ]]; then
  88         cls='minus'
  89         lastonly=0
  90     else
  91         cls=
  92         lastonly=0
  93     fi
  94
  95     # Convert &, <, > to HTML entities.
  96     s=$(sed -e 's/\&/\&amp;/g' -e 's/</\&lt;/g' -e 's/>/\&gt;/g' <<<"$s")
  97     if [[ $first -eq 1 ]]; then
  98         first=0
  99     else
 100         echo
 101     fi
 102
 103     # Output the line.
 104     if [[ "$cls" ]]; then
 105         echo -n '<span class="'${cls}'">'${s}'</span>'
 106     else
 107         echo -n ${s}
 108     fi
 109     read -r s
 110 done
 111 IFS=$OIFS
 112
 113 if [[ $diffseen -eq 0  &&  $onlyseen -eq 0 ]]; then
 114     echo -n '</span>'
 115 else
 116     echo "</div>"
 117 fi
 118 echo
 119
 120 cat <<XX
 121 </pre>
 122 </body>
 123 </html>
 124 XX