Argbash Interpreter

README.md

Simple wrapper around argbash to enable Argbash scripts without the need for directly compiling as changes are made

A shasum of the script is generated when run and this is compared with the exxisting files hash, if it's changed, we compile the script with argbash, save it to the cache folder and run the rebuilt file

argbash-interpreter.sh

#!/usr/bin/env bash
#
set -eu
SHA_BIN=shasum
if [[ `which shasum` == "" ]]; then
    SHA_BIN="sha256sum"
fi
SCRIPT_HOME="~"
CACHE_PATH="$SCRIPT_HOME/bin/.argbash-cache"
SCRIPT_NAME=`basename "$1"`
SCRIPT_PATH="`dirname "$1"`/$SCRIPT_NAME"
SCRIPT_CONTENT=`cat "$SCRIPT_PATH"`
NAME_HASH=`echo "$SCRIPT_PATH" | $SHA_BIN | awk '{print \$1}'`
SCRIPT_HASH=`$SHA_BIN "$SCRIPT_PATH" | awk '{print \$1}'`
CACHE_FILE="$CACHE_PATH/${SCRIPT_NAME}-${NAME_HASH}"
DEBUG="${DEBUG_INTERPRETER:-}"

_debug_interpreter()
{
    if [[ "$DEBUG" != "" ]]; then
        echo $@
    fi
}

if [ ! -d "$CACHE_PATH" ]; then
    DEBUG="true"
    echo "Creating cache path"
    mkdir $CACHE_PATH
fi

if [ -f "$CACHE_FILE".shasum ]; then
    _debug_interpreter "Existing checksum found, comparing hashes"
    OLD_SCRIPT_HASH=`cat "$CACHE_FILE".shasum`
    if [[ "$OLD_SCRIPT_HASH" != "$SCRIPT_HASH" ]]; then
        _debug_interpreter "Existing hash does not match, removing old files"
        rm  -f "$CACHE_FILE" "$CACHE_FILE.shasum" "$CACHE_PATH/$OLD_SCRIPT_HASH" "$CACHE_PATH/$OLD_SCRIPT_HASH.shasum"
    else
        _debug_interpreter "Hashes matched, no compilation required"
    fi
else
    if [ -f "$CACHE_FILE" ]; then
        _debug_interpreter "A cache file exists even though there is no checksum, deleting"
        rm "$CACHE_FILE"
    fi
fi

if [ ! -f "$CACHE_FILE" ]; then
    _debug_interpreter "Rebuilding script $SCRIPT_PATH, caching to $CACHE_FILE"
    argbash "$SCRIPT_PATH" | sed -e "s~argbash-interpreter~bash~" > "$CACHE_FILE"
    echo "$SCRIPT_HASH" > "$CACHE_FILE".shasum
    chmod +x "$CACHE_FILE"
fi

_debug_interpreter "



"
$CACHE_FILE "${@:2}"

example.sh

#!/usr/bin/env argbash-interpreter
#
# m4_ignore(
echo "This is just a script template, not the script (yet) - pass it to 'argbash' to fix this." >&2
exit 11  #)Created by argbash-init v2.3.0
#
#
# ARG_OPTIONAL_BOOLEAN([debug],[d],[Print commands that are run?], [off])
# ARG_HELP([The general script's help msg])
# ARGBASH_GO

# [ <-- needed because of Argbash
set -eu

if [[ $_arg_debug == "on" ]]; then
    set -x
fi


# ] <-- needed because of Argbash