1 files changed, 16 insertions, 3 deletions

diff --git a/build.sh b/build.sh
index 93f0294..ca598e9 100755
--- a/build.sh
+++ b/build.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 
+basedir="$(pwd)"
+
 recursivebuild() {
         local destdir=$(echo "$1" | sed 's|^src|http|')
         mkdir -p "$destdir"
@@ -13,17 +15,28 @@ recursivebuild() {
         done
 }
 
+mdpreprocess() {
+        file="$1"
+        if [ "$(echo "$file" | sed 's/.*\.//')" = "m4" ]; then
+                printf 'm4_include(macros.m4)m4_dnl\n%s\n' "$(cat "$file")" | \
+                        m4 -P -I "$basedir/utils"
+        else
+                cat "$file"
+        fi
+}
+
 copyfile() {
         file=$1
         dest=$2
         ind=$dest/index.html
         extension=$(echo "$file" | sed 's/.*\.//')
         case "$extension" in
-        md)
+        md|m4)
                 t="$(markdowntitle "$file")"
                 sed "s/TITLE/$t/" < top.html > "$ind"
-                lowdown --html-no-skiphtml --html-no-escapehtml \
-                        "$file" >> "$ind"
+                mdpreprocess "$file" | \
+                        lowdown --html-no-skiphtml --html-no-escapehtml \
+                        >> "$ind"
                 cat bottom.html >> "$ind"
                 ;;
         html)