jshint

#!/bin/bash
#
# A command-line frontent to jshint.
# We try to auto-detect a supported environment and use it.
#
# TODO: auto-detect the node jshint frontend
#

function quiet {
    "$@" >/dev/null 2>&1
}

function abspath {
    path="$1"
    if [[ "$path" =~ ^/ ]]; then
        echo $path
    else
        echo "$PWD/$path"
    fi
}

function getOpts {
    if [[ "$@" =~ (^| )--?h ]]; then
        echo "usage: jshint ['{\"opt1\":true,\"opt2\":false}'] file1.js ..."
        exit 0
    fi

    # heuristic for json argument: not a file and looks like json
    if [[ ! -f "$1" && "$1" =~ \{.*\} ]]; then
        jsopts="$1"
        shift
    else
        jsopts="{}"
    fi
    
    # Make sure all input files are absolute paths.
    index=0
    for file in "$@"; do
        files[$index]=`abspath "$file"`
        let index+=1
    done
}

function jsc {
    interpreter="$1"

    for file in "${files[@]}"; do
        if [[ -r "$file" ]]; then
            (cat "$file"; echo "EOF***") | "$interpreter" env/jsc.js -- "$HERE/jshint.js" "$jsopts" "$file"
        else
            echo "Error while reading:" "$file" >&2
        fi
    done
}

function smjs_interpret {
    for file in "${files[@]}"; do
        if [[ -r "$file" ]]; then
            cat "$file" | smjs env/jsc.js "$HERE/jshint.js" "$jsopts" "$file"
        else
            echo "Error while reading:" "$file" >&2
        fi
    done
}

function main {
    getOpts "$@"
    cd $HERE

    if quiet which d8; then
        d8 env/d8.js -- "$jsopts" "${files[@]}"
    elif quiet which smjs; then
        smjs_interpret
    elif quiet which jsc; then
        jsc jsc
    elif [ -e "/System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc" ]; then
        jsc /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc
    else
        echo "Could not find any supported JavaScript environment. Looked for: d8 jsc smjs"
        exit 1
    fi
}

if [[ -L "$0" ]]; then
    SCRIPT=`readlink $0`
else
    SCRIPT="$0"
fi
HERE=`abspath $SCRIPT`
HERE=`dirname $HERE`

main "$@"

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