desource

#!/usr/bin/env bash

# Replace source references with the contents of the source files
#
# This script is not particularly adaptive: it assumes several
# things about the source and cannot cope with deviation.
#
# 1. It does not translate lines that start:
#    source $( ... ).  This preserves the ate_sources construction.
# 2. Each line of a source file's contents will be prefixed with
#    the number of spaces that prefixed the source file line.
# 3. An important exception to #2 is that the spaces prefix
#    WILL NOT be prepended to a line that contains only 'EOF'
#    so the heredoc will work

declare template=$( realpath "$1" )
declare -a parts

declare OIFS="$IFS"
IFS='/'
read -r -a parts <<< "$template"
declare tpath="${parts[*]:0:$(( ${#parts[*]} - 1))}"
IFS="$OIFS"

declare indent

while IFS="" read -r line; do
    if [[ "$line" =~ ^([[:space:]]*)source\ +([^$].*)$ ]]; then
        indent="${BASH_REMATCH[1]}"
        while IFS="" read -r subline; do
            if [[ "${subline:0:1}" == '#' ]]; then
                continue
            fi
            if [[ "$subline" =~ ^EOF$ ]]; then
                echo "$subline"
            elif [ -z "$subline" ]; then
                echo
            else
                echo "${indent}$subline"
            fi
        done < "${tpath}/${BASH_REMATCH[2]}"
    else
        echo "$line"
    fi
done < "$template"