plomlompom.com Git - redo-blog/blob - processor/feed.xml.do

   1 #!/bin/sh
   2
   3 # Pull in global dependencies.
   4 . ./helpers.sh
   5 author_file=author.meta
   6 uuid_file=uuid.meta
   7 title_file=title.meta
   8 redo-ifchange "$url_file"
   9 redo-ifchange "$author_file"
  10 redo-ifchange "$uuid_file"
  11 redo-ifchange "$title_file"
  12
  13 # Build some variables. XML-escape even file contents that should not contain
  14 # dangerous characters, just to avoid any XML trouble.
  15 srcdir=`pwd`
  16 basepath=$(get_basepath)
  17 title=`read_and_escape_file "$title_file" | head -1`
  18 author=`read_and_escape_file "$author_file" | head -1`
  19 uuid=`read_and_escape_file "$uuid_file" | head -1`
  20
  21 # Write majority of feed head.
  22 cat << EOF
  23 <?xml version="1.0" encoding="utf-8"?>
  24 <feed xmlns="http://www.w3.org/2005/Atom">
  25 EOF
  26 printf "<link href=\"%s\" />\n" "$basepath"
  27 printf "<link href=\"%sfeed.xml\" rel=\"self\" />\n" "$basepath"
  28 printf "<title type=\"html\">%s</title>\n" "$title"
  29 printf "<author><name>%s</name></author>\n" "$author"
  30 printf "<id>urn:uuid:%s</id>\n" "$uuid"
  31
  32 # Generate feed entry snippets.
  33 mkdir -p feed_snippets
  34 for file in ./*.rst ./*.md; do
  35   if [ -e "$file" ]; then
  36     uuid_file="${file%.*}.uuid"
  37     redo-ifchange "$uuid_file"
  38     published=`stat -c%y "${uuid_file}"`
  39     published_unix=$(date -u "+%s%N" -d "${published}")
  40     snippet_file="${file%.*}.feed_snippet"
  41     redo-ifchange "$snippet_file"
  42     ln -s "$srcdir/$snippet_file" "./feed_snippets/${published_unix}"
  43   fi
  44 done
  45
  46 # Derive feed modification date from snippets.
  47 mod_dates=$(grep -hE "^<updated>" ./feed_snippets/* | sed -E 's/<.?updated>//g')
  48 last_mod_unix=0
  49 for date in $mod_dates; do
  50   date_unix=$(date -u "+%s" -d "${date}")
  51   if [ "$date_unix" -gt "$last_mod_unix" ]; then
  52     last_mod_unix=$date_unix
  53   fi
  54 done
  55 lastmod_rfc3339=`date -u "+%Y-%m-%dT%TZ" -d "@${last_mod_unix}"`
  56 printf "<updated>%s</updated>\n\n" "$lastmod_rfc3339"
  57
  58 # Write feed entries.
  59 for file in ./feed_snippets/*; do
  60   cat "${file}"
  61   printf "\n"
  62 done
  63 rm -rf feed_snippets
  64
  65 # Write feed foot.
  66 printf "</feed>"