Function discoverJavaHome

extensions/java-modernization-studio/doctor.mjs:157–190

(env, plat, readRc)

 * injectable for tests.
 */
export async function discoverJavaHome(env, plat, readRc) {
    const e = env || {};
    if (e.JAVA_HOME) return e.JAVA_HOME; // already explicit in this process
    if (plat === "win32") return null; // not a $JAVA_HOME/rc world
    const home = e.HOME || "";
    if (!home) return null;
    const shell = e.SHELL || (plat === "darwin" ? "/bin/zsh" : "/bin/bash");
    const names = /zsh/.test(shell)
        ? [".zshenv", ".zprofile", ".zshrc"]
        : /bash/.test(shell)
            ? [".bash_profile", ".bashrc", ".profile"]
            : [".profile"];
    const read =
        readRc ||
        (async (p) => {
            try {
                return await readFile(p, "utf8");
            } catch {
                return null;
            }
        });
    let found = null;
    for (const name of names) {
        let text = null;
        try {
            text = await read(join(home, name));
        } catch {
            text = null;
        }
        const val = parseJavaHomeFromRc(text, e);
        if (val) found = val; // later rc files (e.g. .zshrc) win
    }
    return found || null;
}

/** Probe a single tool. Returns { key, found, version }. */
export async function probeOne(def, exec) {