clj-env

#!/bin/sh

# TODO: Either allow custom jar path, or to set/link custom builds
# TODO: When specifying an uninstalled version, prompt to install it

set -e

readonly CLJ_HOME=$HOME/.clj

readonly clj_url_prefix="http://repo1.maven.org/maven2/org/clojure/clojure"

set_clj_version()
{
    if [ -z "${1+x}" ]; then
        >&2 echo "Error: must specify version"
    else
        clj_version=$1
    fi
}

case $1 in
    install)
        set_clj_version "$2"
        if [ -n "${clj_version+x}" ]; then
            remote_path="$clj_url_prefix/$clj_version/clojure-$clj_version.jar"
            status=$(curl -X HEAD -I --write-out "%{http_code}" -o /dev/null "$remote_path")
            if [ "$status" = "200" ]; then
                curl -o "$CLJ_HOME/clojure-$clj_version.jar" "$remote_path"
            else
                >&2 echo "Error: could not download version $clj_version"
            fi
        fi
        ;;
    "set")
        set_clj_version "$2"
        echo "$clj_version" > "$CLJ_HOME/default"
        ;;
    path)
        if [ -n "$2" ]; then
            set_clj_version "$2"
            echo "$CLJ_HOME/clojure-$clj_version.jar"
        elif [ -f "$CLJ_HOME/default" ]; then
            echo "$CLJ_HOME"/clojure-"$(cat "$CLJ_HOME"/default)".jar
        else
            >&2 echo "Error: run 'clj-env set x.y.z' to set the default version"
        fi
        ;;
    *)
        echo "Usage: clj-env [install x.y.z | set x.y.z | path | path x.y.z]"
        ;;
esac