Lint for tabs

Closes whatwg/whatwg.org#246.

Author: domenic

lint.sh

@@ -13,6 +13,7 @@ MATCHES=$(grep -niE '( (code|span|var)(>| data-x=)|[^<;]/(code|span|var)>)' "$1"
   perl -ne '$/ = "\n\n"; print "$_" if (/\ban\s+(<[^>]*>)*(?!(L\b|http|https|href|hgroup|rb|rp|rt|rtc|li|xml|svg|svgmatrix|hour|hr|xhtml|xslt|xbl|nntp|mpeg|m[ions]|mtext|merror|h[1-6]|xmlns|xpath|s|x|sgml|huang|srgb|rsa|only|option|optgroup)\b|html)[b-df-hj-np-tv-z]/si or /\b(?<![<\/;])a\s+(?!<!--grammar-check-override-->)(<[^>]*>)*(?!&gt|one)(?:(L\b|http|https|href|hgroup|rt|rp|li|xml|svg|svgmatrix|hour|hr|xhtml|xslt|xbl|nntp|mpeg|m[ions]|mtext|merror|h[1-6]|xmlns|xpath|s|x|sgml|huang|srgb|rsa|only|option|optgroup)\b|html|[aeio])/si)' "$1" | perl -lpe 'print "\nPossible grammar problem: \"a\" instead of \"an\" or vice versa (to override, use e.g. \"a <!--grammar-check-override-->apple\"):" if $. == 1'
   grep -ni 'and/or' "$1" | perl -lpe 'print "\nOccurrences of making Ms2ger unhappy and/or annoyed:" if $. == 1'
   grep -niE '\s+$' "$1" | perl -lpe 'print "\nTrailing whitespace:" if $. == 1'
+  grep $'\t' "$1" | perl -lpe 'print "\nTab:" if $. == 1'
   perl -ne '$/ = "\n\n"; print "$_" if (/class="?(note|example).+(\n.+)*\s+(should|must|may|optional|recommended)(\s|$)/mi)' "$1" | perl -lpe 'print "\nRFC2119 keyword in example or note (use: might, can, has to, or override with <!--non-normative-->must):" if $. == 1'
   perl -ne '$line++; $in_domintro = 1 if (/^  <dl class="domintro">$/); print "$line: $_" if ($in_domintro && /\s+(should|must|may|optional|recommended)(\s|$)/i); $in_domintro = 0 if (/^  <\/dl>$/)' "$1" | perl -lpe 'print "\nRFC2119 keyword in domintro (use: might, can, has to, or override with <!--non-normative-->must):" if $. == 1'
   )