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

   1 #!/bin/sh
   2
   3 build_entry () {
   4   file="${1}"
   5   uuidfile="${2}"
   6   published="${3}"
   7   intermediate_file="${file%.*}.intermediate"
   8   htmlfile=`escape_url "${file%.*}.html"`
   9   redo-ifchange "$uuid_file"
  10   redo-ifchange "$intermediate_file"
  11   lastmod=`stat -c%y "$file"`
  12   lastmod_rfc3339=`date -u "+%Y-%m-%dT%TZ" -d "$lastmod"`
  13   title=`read_and_escape_file "$intermediate_file" | head -1`
  14   uuid=`read_and_escape_file "$uuid_file" | head -1`
  15   body=`read_and_escape_file "$intermediate_file" | sed 1d`
  16   published_rfc3339=`date -u "+%Y-%m-%dT%TZ" -d "${published}"`
  17   printf "<entry>\n"
  18   printf "<title type=\"html\">%s</title>\n" "$title"
  19   printf "<id>urn:uuid:%s</id>\n" "$uuid"
  20   printf "<updated>%s</updated>\n" "$lastmod_rfc3339"
  21   printf "<published>%s</published>\n" "$published_rfc3339"
  22   printf "<link href=\"%s%s\" />\n" "$basepath" "${htmlfile#\./}"
  23   printf "<content type=\"html\">\n%s\n</content>\n" "$body"
  24   printf "</entry>"
  25 }
  26
  27 # Pull in global dependencies.
  28 . ./helpers.sh
  29 url_file=url.meta
  30 author_file=author.meta
  31 uuid_file=uuid.meta
  32 title_file=title.meta
  33 redo-ifchange "$url_file"
  34 redo-ifchange "$author_file"
  35 redo-ifchange "$uuid_file"
  36 redo-ifchange "$title_file"
  37
  38 # Build some variables. XML-escape even file contents that should not contain
  39 # dangerous characters, just to avoid any XML trouble.
  40 base_url=`cat "$url_file" | head -1`
  41 url_protocol=`echo $base_url | cut -d ':' -f 1`
  42 url_basepath=`echo $base_url | cut -d '/' -f 3-`
  43 url_basepath_escaped=`escape_url "$url_basepath"`
  44 basepath="$url_protocol""://""$url_basepath_escaped"
  45 title=`read_and_escape_file "$title_file" | head -1`
  46 author=`read_and_escape_file "$author_file" | head -1`
  47 uuid=`read_and_escape_file "$uuid_file" | head -1`
  48
  49 # Write majority of feed head.
  50 cat << EOF
  51 <?xml version="1.0" encoding="utf-8"?>
  52 <feed xmlns="http://www.w3.org/2005/Atom">
  53 EOF
  54 printf "<link href=\"%s\" />\n" "$basepath"
  55 printf "<link href=\"%sfeed.xml\" rel=\"self\" />\n" "$basepath"
  56 printf "<title type=\"html\">%s</title>\n" "$title"
  57 printf "<author><name>%s</name></author>\n" "$author"
  58 printf "<id>urn:uuid:%s</id>\n" "$uuid"
  59
  60 # Generate feed entry snippets.
  61 mkdir -p feed_snippets
  62 for file in ./*.rst ./*.md; do
  63   if [ -e "$file" ]; then
  64     uuid_file="${file%.*}.uuid"
  65     redo-ifchange "$uuid_file"
  66     published=`stat -c%y "${uuid_file}"`
  67     published_unix=$(date -u "+%s%N" -d "${published}")
  68     entry=$(build_entry "${file}" "${uuid_file}" "${published}")
  69     echo "${entry}" > ./feed_snippets/${published_unix}
  70   fi
  71 done
  72
  73 # Derive feed modification date from snippets.
  74 mod_dates=$(grep -hE "^<updated>" ./feed_snippets/* | sed -E 's/<.?updated>//g')
  75 last_mod_unix=0
  76 for date in $mod_dates; do
  77   date_unix=$(date -u "+%s" -d "${date}")
  78   if [ "$date_unix" -gt "$last_mod_unix" ]; then
  79     last_mod_unix=$date_unix
  80   fi
  81 done
  82 lastmod_rfc3339=`date -u "+%Y-%m-%dT%TZ" -d "@${last_mod_unix}"`
  83 printf "<updated>%s</updated>\n\n" "$lastmod_rfc3339"
  84
  85 # Write feed entries.
  86 for file in ./feed_snippets/*; do
  87   cat "${file}"
  88   printf "\n"
  89 done
  90 rm -rf feed_snippets
  91
  92 # Write feed foot.
  93 printf "</feed>"