#!/bin/sh


# Run this before committing changes to shell scripts.

PROGNAME=${0##*/}

ASH="ash -n"
BASH="bash --posix -n"
DASH="dash -n"
KSH="ksh -n"
POSH="posh -n"
ERROR=""

usage () {
    cat <<EOF
Usage: $PROGNAME SCRIPT ...
Perform syntax checks on each SCRIPT with POSIX-compatible shells available on
the system.
EOF
}

howl () {
    echo "$PROGNAME: error; $*" >&2
}

warn () {
    echo "$PROGNAME: warning; $*" >&2
}

if [ -z "$1" ]; then
    usage >&2
    exit 2
fi

while [ -n "$1" ]; do
    if ! [ -r "$1" ]; then
        howl "\"$1\" does not exist or is not readable"
        usage >&2
        exit 2
    fi
    for SH in "$BASH" "$DASH" "$KSH" "$POSH"; do
        CMD=${SH%% *}
        if which "$CMD" >/dev/null 2>&1; then
            if ! $SH "$1"; then
                echo "$PROGNAME: \"$1\" failed syntax check with $CMD"
                error="yes"
            fi
        else
            warn "cannot verify correctness of \"$1\" with $CMD; shell not" \
                 "available"
        fi
    done
    shift
done

if [ -n "$ERROR" ]; then
  exit 1
fi

exit 0

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