mkapp

#!/usr/bin/env bash

export M4_APP_DIR=$1
export APP_DIR=$2

function copy_and_expand () {
    IN=$1;
    OUT=$2;

    ## any environment variable beginning with POOTPOOT gets
    ## automatically propagated into an m4 macro
    DEFINES=""
    for key in `env | grep ^POOTPOOT | sed -e 's/=.*//'`; do
        value=`env | grep ^${key} | sed -e 's/[^=]*=//'`
        DEFINES="$DEFINES --define=${key}=${value}"
    done

    ## the m4 rules:
    ##  . files named *.m4 are ignored
    ##  . files named *.*.m4 are expanded as *.*
    for path in `(cd $IN; ls -1 | grep '\..*\.m4$')`; do
        outpath=`echo $path | sed -e 's/\.m4$//'`
        m4 $DEFINES -E -I $IN -P $IN/$path > $OUT/$outpath
    done

    for path in `(cd $IN; ls -1 | grep -v '\.m4$')`; do
        if [ -f $IN/$path ]; then
            cp $IN/$path $OUT/$path
        fi
    done
}

for in_dir in `find $M4_APP_DIR -type d | sed -e "s/${M4_APP_DIR}/./"`; do
    out_dir="${APP_DIR}/${in_dir}"
    mkdir -p ${out_dir}
    copy_and_expand "${M4_APP_DIR}/$in_dir" $out_dir
done