Unified · Split
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| 1 | +#!/bin/awk -f | |
| 2 | + | |
| 3 | +# md2html.awk | |
| 4 | +# by: Jesus Galan (yiyus) <yiyu.jgl@gmail>, May 2009 | |
| 5 | +# Usage: | |
| 6 | +# md2html file.md > file.html | |
| 7 | +# Options: -v esc=false to not escape html | |
| 8 | + | |
| 9 | +function newblock(nblock){ | |
| 10 | + if(text) | |
| 11 | + print "<" block ">" text "</" block ">"; | |
| 12 | + text = ""; | |
| 13 | + block = nblock ? nblock : "p"; | |
| 14 | +} | |
| 15 | + | |
| 16 | +function subinline(tgl, inl){ | |
| 17 | + while(match($0, tgl)){ | |
| 18 | + if (inline[ni] == inl) | |
| 19 | + ni -= sub(tgl, "</" inl ">"); | |
| 20 | + else if (sub(tgl, "<" inl ">")) | |
| 21 | + inline[++ni] = inl; | |
| 22 | + } | |
| 23 | +} | |
| 24 | + | |
| 25 | +function dolink(href, lnk){ | |
| 26 | + # Undo escaped html in uris | |
| 27 | + gsub(/&/, "\\&", href); | |
| 28 | + gsub(/</, "<", href); | |
| 29 | + gsub(/>/, ">", href); | |
| 30 | + # & can be tricky, and not standard: | |
| 31 | + gsub(/&/, "\\\\\\&", href); | |
| 32 | + gsub(/&/, "\\\\\\&", lnk); | |
| 33 | + return "<a href=\"" href "\">" lnk "</a>"; | |
| 34 | +} | |
| 35 | + | |
| 36 | +BEGIN { | |
| 37 | + ni = 0; # inlines | |
| 38 | + nl = 0; # nested lists | |
| 39 | + text = ""; | |
| 40 | + block = "p"; | |
| 41 | +} | |
| 42 | + | |
| 43 | +# Escape html | |
| 44 | +esc != "false" { | |
| 45 | + gsub("&", "\\&") | |
| 46 | + gsub("<", "\\<") | |
| 47 | + gsub(">", "\\>") | |
| 48 | +} | |
| 49 | + | |
| 50 | +# Horizontal rules (_ is not in markdown) | |
| 51 | +/^[ ]*([-*_] ?)+[ ]*$/ && text == "" { | |
| 52 | + print "<hr>"; | |
| 53 | + next; | |
| 54 | +} | |
| 55 | + | |
| 56 | +# Tables (not in markdown) | |
| 57 | +# Syntax: | |
| 58 | +# Right Align| Center Align |Left Align | |
| 59 | +/([ ]\|)|(\|[ ])/ { | |
| 60 | + if(block != "table") | |
| 61 | + newblock("table"); | |
| 62 | + nc = split($0, cells, "|"); | |
| 63 | + $0 = "<tr>\n"; | |
| 64 | + for(i = 1; i <= nc; i++){ | |
| 65 | + align = "left"; | |
| 66 | + if(sub(/^[ ]+/, "", cells[i])){ | |
| 67 | + if(sub(/[ ]+$/, "", cells[i])) | |
| 68 | + align = "center"; | |
| 69 | + else | |
| 70 | + align = "right"; | |
| 71 | + } | |
| 72 | + sub(/[ ]+$/,"", cells[i]); | |
| 73 | + $0 = $0 "<td align=\"" align "\">" cells[i] "</td>\n"; | |
| 74 | + } | |
| 75 | + $0 = $0 "</tr>"; | |
| 76 | +} | |
| 77 | + | |
| 78 | +# Ordered and unordered (possibly nested) lists | |
| 79 | +/^[ ]*([*+-]|(([0-9]+[\.-]?)+))[ ]/ { | |
| 80 | + newblock("li"); | |
| 81 | + nnl = 1; | |
| 82 | + while(match($0, /^[ ]/)){ | |
| 83 | + sub(/^[ ]/,""); | |
| 84 | + nnl++; | |
| 85 | + } | |
| 86 | + while(nl > nnl) | |
| 87 | + print "</" list[nl--] ">"; | |
| 88 | + while(nl < nnl){ | |
| 89 | + list[++nl] = "ol"; | |
| 90 | + if(match($0, /^[*+-]/)) | |
| 91 | + list[nl] = "ul"; | |
| 92 | + print "<" list[nl] ">"; | |
| 93 | + } | |
| 94 | + sub(/^([*+-]|(([0-9]+[\.-]?)+))[ ]/,""); | |
| 95 | +} | |
| 96 | + | |
| 97 | +# Multi line list items | |
| 98 | +block == "li" { | |
| 99 | + sub(/^( *)|( *)/,""); | |
| 100 | +} | |
| 101 | + | |
| 102 | +# Code blocks | |
| 103 | +/^( | )/ { | |
| 104 | + if(block != "pre") | |
| 105 | + newblock("pre"); | |
| 106 | + sub(/^( | )/, ""); | |
| 107 | + text = text $0 "\n"; | |
| 108 | + next; | |
| 109 | +} | |
| 110 | + | |
| 111 | +# Paragraph | |
| 112 | +/^$/ { | |
| 113 | + newblock(); | |
| 114 | + while(nl > 0) | |
| 115 | + print "</" list[nl--] ">"; | |
| 116 | +} | |
| 117 | + | |
| 118 | +# Setex-style Headers | |
| 119 | +# (Plus h3 with underscores.) | |
| 120 | +/^=+$/ { | |
| 121 | + block = "h" 1; | |
| 122 | + next; | |
| 123 | +} | |
| 124 | + | |
| 125 | +/^-+$/ { | |
| 126 | + block = "h" 2; | |
| 127 | + next; | |
| 128 | +} | |
| 129 | + | |
| 130 | +/^_+$/ { | |
| 131 | + block = "h" 3; | |
| 132 | + next; | |
| 133 | +} | |
| 134 | + | |
| 135 | +# Atx-style headers | |
| 136 | +/^#/ { | |
| 137 | + newblock(); | |
| 138 | + match($0, /#+/); | |
| 139 | + n = RLENGTH; | |
| 140 | + if(n > 6) | |
| 141 | + n = 6; | |
| 142 | + text = substr($0, RLENGTH + 1); | |
| 143 | + block = "h" n; | |
| 144 | + next; | |
| 145 | +} | |
| 146 | + | |
| 147 | +// { | |
| 148 | + # Images | |
| 149 | + while(match($0, /!\[[^\]]+\]\([^\)]+\)/)){ | |
| 150 | + split(substr($0, RSTART + 2, RLENGTH - 3), a, /\]\(/); | |
| 151 | + sub(/!\[[^\]]+\]\([^\)]+\)/, "<img src=\"" a[2] "\" alt=\"" a[1] "\">"); | |
| 152 | + } | |
| 153 | + # Links | |
| 154 | + while(match($0, /\[[^\]]+\]\([^\)]+\)/)){ | |
| 155 | + split(substr($0, RSTART + 1, RLENGTH - 2), a, /\]\(/); | |
| 156 | + sub(/\[[^\]]+\]\([^\)]+\)/, dolink(a[2], a[1])); | |
| 157 | + } | |
| 158 | + # Auto links (uri matching is poor) | |
| 159 | + na = split($0, a, /(^\()|[ ]|([,\.\)]([ ]|$))/); | |
| 160 | + for(i = 1; i <= na; i++) | |
| 161 | + if(match(a[i], /^(((https?|ftp|file|news|irc):\/\/)|(mailto:)).+$/)) | |
| 162 | + sub(a[i], dolink(a[i], a[i])); | |
| 163 | + # Inline | |
| 164 | + subinline("(\\*\\*)|(__)", "strong"); | |
| 165 | + subinline("\\*", "em"); | |
| 166 | + subinline("`", "code"); | |
| 167 | + text = text (text ? " " : "") $0; | |
| 168 | +} | |
| 169 | + | |
| 170 | +END { | |
| 171 | + while(ni > 0) | |
| 172 | + text = text "</" inline[ni--] ">"; | |
| 173 | + newblock(); | |
| 174 | + while(nl > 0) | |
| 175 | + print "</" list[nl--] ">"; | |
| 176 | +} | |