Add index script

Index automatically adds appropriate ids to HTML headings
and prints an index of all headings on stderr (unless given the
-s, silent, option).

1 files changed, 74 insertions, 0 deletions

diff --git a/index b/index
new file mode 100755
index 0000000..accd0be
--- /dev/null
+++ b/index
@@ -0,0 +1,74 @@
+#!/bin/rc -e
+
+# index -- add ids to headings and print index to stderr
+
+flagfmt=s
+args='[file ...]'
+
+if(! ifs=() eval `{aux/getflags $*}){
+	aux/usage
+	exit usage
+}
+
+fn source{
+	if(! ~ $#* 0)
+		cat $*
+	if not
+		cat
+}
+
+source $* | awk '
+	/<h[0-9]>.*<\/h[0-9]/ {
+		heading($0)
+		next
+	}
+	/<h[0-9]>/ {
+		open = 1
+		s = $0
+		next
+	}
+	open && /<\/h[0-9]>/ {
+		open = 0
+		s = s "\n" $0
+		heading(s)
+		next
+	}
+	open { s = s " " $0; next }
+	{ print }
+
+	function heading(s) {
+		i = s
+		sub("^.*<h[0-9]>", "", i)
+		sub("</h[0-9]>.*$", "", i)
+		i = toascii(i)
+		sub("^<h[0-9]", "& id=\"" i "\"", s)
+		print s
+		if (!ENVIRON["flags"]) { # if not silent mode
+			sub("^<h", "", s)
+			sub(" id=\"", "	", s)
+			sub("\">", "	", s)
+			sub("<\/h[0-9]>$", "", s)
+			print s > "/dev/stderr"
+		}
+	}
+
+	function toascii(s) {
+		s = tolower(s)
+		gsub("[ÀÁÂÃÄÅàáâãäå]", "a", s)
+		gsub("[Ææ]", "ae", s)
+		gsub("[Çç]", "c", s)
+		gsub("[Ðð]", "dh", s)
+		gsub("[ÈÉÊËèéêë]", "e", s)
+		gsub("[ÌÍÎÏìíîï]", "i", s)
+		gsub("[Ññ]", "n", s)
+		gsub("[ÒÓÔÕÖØòóôõöø]", "o", s)
+		gsub("[ß]", "ss", s)
+		gsub("[Þþ]", "th", s)
+		gsub("[ÙÚÛÜùúûü]", "u", s)
+		gsub("[×]", "x", s)
+		gsub("[Ýýÿ]", "y", s)
+		gsub("[^-a-z_ 	]", "", s)
+		gsub("[ 	]+", "-", s)
+		return s
+	}
+'