headline atttributes

diff --git a/markdown.awk b/markdown.awk
index 8ac8b6323dc20277efc35767f8d140a2afc17957..506d22d08474b5f4a14dc5953c1dda121f4b9678 100755 (executable)
--- a/markdown.awk
+++ b/markdown.awk
@@ -40,6 +40,7 @@
 # ----------------------------
 # - [x] Automatic <section>-wrapping (custom)
 # -  ?  Heading identifiers (php md, pandoc)
+#   - [x] Heading attributes (custom)
 # - [x] Automatic heading identifiers (custom)
 # - [x] Fenced code blocks (php md, pandoc)
 #   - [x] Fenced code attributes
@@ -307,7 +308,7 @@ function inline( line, LOCAL, len, code, href, guard ) {
   }
 }
 
-function headline( hlvl, htxt, LOCAL, sec, n, HL) {
+function headline( hlvl, htxt, attrib, LOCAL, sec, n, HL) {
   split( gensub( /^(.* )?([0-9]+( [0-9]+){5})$/, "\\2" ,"1", hstack),  HL);
 
   for ( n = hlvl; n <= 6; n++ ) { sec = sec (HL[n]?"</section>":""); }
@@ -319,8 +320,8 @@ function headline( hlvl, htxt, LOCAL, sec, n, HL) {
   hstack = gensub( /^(.* )?([0-9]+( [0-9]+){5})$/, "\\1" ,"1", hstack) \
            HL[1] " " HL[2] " " HL[3] " " HL[4] " " HL[5] " " HL[6];
 
-  return sec "<section class=\"h" hlvl "\" id=\"" hid "\">" \
-         "<h" hlvl ">" inline( htxt ) \
+  return sec "<section class=\"" (attrib ? "h" hlvl " " attrib : "h" hlvl)  "\" id=\"" hid "\">" \
+         "<h" hlvl (attrib ? " class=\"" attrib "\"" : "") ">" inline( htxt ) \
          "<a class=\"anchor\" href=\"#" hid "\"></a>" \
          "</h" hlvl ">\n\n";
 }
@@ -589,28 +590,60 @@ function _block( block, LOCAL, st, len, hlvl, htxt, sec, guard, code, indent, at
   gsub("(^|\n) {0," indent "}", "\n", list);
   return "\n<ol>\n" _list( substr(list, 2) ) "</ol>\n" _block( block );
 
+  # First Order Heading H1 + Attrib
+  } else if ( match( block, /^([^\n]+)([ \t]*\{([^\}\n]+)\})\n===+(\n|$)/ ) ) {
+    len = RLENGTH;
+    text   = gensub(/^([^\n]+)([ \t]*\{([^\}\n]+)\})\n===+(\n.*)?$/, "\\1", 1, block)
+    attrib = gensub(/^([^\n]+)([ \t]*\{([^\}\n]+)\})\n===+(\n.*)?$/, "\\3", 1, block)
+    gsub(/[^a-zA-Z0-9_-]+/, " ", attrib); gsub(/(^ | $)/, "", attrib);
+
+    return headline(1, text, attrib) \
+           _block( substr( block, len + 1 ) );
+
   # First Order Heading H1
-  } else if ( match( block, /^[^\n]+\n===+(\n|$)/ ) ) {
+  } else if ( match( block, /^([^\n]+)\n===+(\n|$)/ ) ) {
     len = RLENGTH;
+    text   = gensub(/^([^\n]+)\n===+(\n.*)?$/, "\\1", 1, block)
 
-    return headline(1, gensub( /\n.*$/, "", "g", block )) \
+    return headline(1, text, 0) \
            _block( substr( block, len + 1 ) );
 
+  # Second Order Heading H2 + Attrib
+  } else if ( match( block, /^([^\n]+)([ \t]*\{([^\}\n]+)\})\n---+(\n|$)/ ) ) {
+    len = RLENGTH;
+    text   = gensub(/^([^\n]+)([ \t]*\{([^\}\n]+)\})\n---+(\n.*)?$/, "\\1", 1, block)
+    attrib = gensub(/^([^\n]+)([ \t]*\{([^\}\n]+)\})\n---+(\n.*)?$/, "\\3", 1, block)
+    gsub(/[^a-zA-Z0-9_-]+/, " ", attrib); gsub(/(^ | $)/, "", attrib);
+
+    return headline(2, text, attrib) \
+           _block( substr( block, len + 1) );
+
   # Second Order Heading H2
-  } else if ( match( block, /^[^\n]+\n---+(\n|$)/ ) ) {
+  } else if ( match( block, /^([^\n]+)\n---+(\n|$)/ ) ) {
+    len = RLENGTH;
+    text   = gensub(/^([^\n]+)\n---+(\n.*)?$/, "\\1", 1, block)
+
+    return headline(2, text, 0) \
+           _block( substr( block, len + 1) );
+
+  # Nth Order Heading H1 H2 H3 H4 H5 H6 + Attrib
+  } else if ( match( block, /^(#{1,6})[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[ \t]*[^ \t\n#])+)[ \t]*#*([ \t]*\{([a-zA-Z \t-]*)\})(\n|$)/ ) ) {
     len = RLENGTH;
+    n      = gensub(/^(#{1,6})[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[ \t]*[^ \t\n#])+)[ \t]*#*([ \t]*\{([a-zA-Z \t-]*)\})(\n.*)?$/, "\\1", 1, block);
+    text   = gensub(/^(#{1,6})[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[ \t]*[^ \t\n#])+)[ \t]*#*([ \t]*\{([a-zA-Z \t-]*)\})(\n.*)?$/, "\\2", 1, block);
+    attrib = gensub(/^(#{1,6})[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[ \t]*[^ \t\n#])+)[ \t]*#*([ \t]*\{([a-zA-Z \t-]*)\})(\n.*)?$/, "\\5", 1, block);
+    gsub(/[^a-zA-Z0-9_-]+/, " ", attrib); gsub(/(^ | $)/, "", attrib);
 
-    return headline(2, gensub( /\n.*$/, "", "g", block )) \
+    return headline( length(n), text, attrib ) \
            _block( substr( block, len + 1) );
 
   # Nth Order Heading H1 H2 H3 H4 H5 H6
-  } else if ( match( block, /^#{1,6}[ \t]*[^\n]+([ \t]*#*)(\n|$)/ ) ) {
+  } else if ( match( block, /^(#{1,6})[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[ \t]*[^ \t\n#])+)[ \t]*#*(\n|$)/ ) ) {
     len = RLENGTH;
+    n      = gensub(/^(#{1,6})[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[ \t]*[^ \t\n#])+)[ \t]*#*(\n.*)?$/, "\\1", 1, block);
+    text   = gensub(/^(#{1,6})[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[ \t]*[^ \t\n#])+)[ \t]*#*(\n.*)?$/, "\\2", 1, block);
 
-    return headline( \
-             length( gensub( /^(#{1,6}).*$/, "\\1", "g", block ) ), \
-             gensub(/^#{1,6}[ \t]*(([^ \t\n]+|[ \t]+[^ \t\n#]|[ \t]+#+[^\n#])+)([ \t]*#*)(\n.*)?$/, "\\1", 1, block) \
-           ) \
+    return headline( length(n), text, 0 ) \
            _block( substr( block, len + 1) );
 
   # block images (wrapped in <figure>)