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#!/bin/sh
# Add favicon to header of HTML files. A favicon is a favorites icon,
# which appears in a browser tab that is visiting the given HTML file.
# One use case is for javadoc-generated API documentation.
#
# Usage:
# html-add-favicon <directory> <favicon.png>
# The arguments should be paths relative to the current working directory.
# Once this has been run, running it again has no effect (and does no harm).
# Originally from http://stackoverflow.com/questions/13112123/creating-javadoc-html-pages-that-use-a-favicon
# The original version had several limitations:
# * If a directory does not contain any .html files, it creates a file named "*.html".
# * It does not add a favicon to HTML files generated by the JDK 8 version of javadoc, which uses "<head>" instead of "<HEAD>".
# * If run multiple times, it inserts the favicon multiple times.
# * The mktemp command is not portable (it doesn't work on Mac OS, for example).
# * It does not preserve file permissions.
# * It changes file timestamps even on files that are not changed.
# * It does not hasdle file names containing spaces.
# This version corrects these issues.
patchIt () {
for f in "$1"/*.html ; do
if [ -f "$f" ]; then # if no .html files exist, f is literal "*.html"
tmpfile=$(mktemp patch_favicon_XXXXX)
# This creates tmpfile, with the same permissions as $f.
# The next command will overwrite it but preserve the permissions.
# Hat tip to http://superuser.com/questions/170226/standard-way-to-duplicate-a-files-permissions for this trick.
\cp -p "$f" "$tmpfile"
sed -e " s%<head>\$%<head><link rel=\"icon\" href=\"$2\" type=\"image/png\"/>%" "$f" > "$tmpfile"
if ! cmp "$f" "$tmpfile" >/dev/null 2>&1
then
mv -f "$tmpfile" "$f"
else
rm -f "$tmpfile"
fi
fi;
done ;
for d in "$1"/* ; do
if [ -d "$d" ]; then echo "descending to $d" ; patchIt "$d" "../$2" ; fi ;
done
}
patchIt "$1" "$2"
#eof
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