install.js

//@ts-check
// For Windows, we distribute a prebuilt bsc.exe
// To build on windows, we still need figure out constructing config.ml
// from existing  compiler

// For other OSes, we detect
// if there is other compiler installed and the version matches,
// we get the config.ml from existing OCaml compiler and build whole_compiler

// Otherwise, we build the compiler shipped with Buckle and use the
// old compiler.ml
// This will be run in npm postinstall, don't use too fancy features here

var child_process = require('child_process')
var fs = require('fs')
var path = require('path')
var os = require('os')

var os_type = os.type()
var root_dir = path.join(__dirname, '..')
var lib_dir = path.join(root_dir, 'lib')
var root_dir_config = { cwd: root_dir, stdio: [0, 1, 2] }

var config = require('./config.js')
var make = config.make
var is_windows = config.is_windows
var sys_extension = config.sys_extension
// Add vendor bin path
// So that second try will work
process.env.PATH =
    path.join(__dirname, '..', 'vendor', 'ocaml', 'bin') +
    path.delimiter +
    process.env.PATH

function setUpNinja() {
    var vendor_ninja_version = '1.8.2'
    var ninja_bin_output = path.join(root_dir, 'lib', 'ninja.exe')
    var ninja_source_dir = path.join(root_dir, 'vendor', 'ninja')
    var ninja_build_dir = path.join(root_dir, 'vendor', 'ninja-build')

    function build_ninja() {
        console.log('No prebuilt Ninja, building Ninja now')
        var build_ninja_command = "./configure.py --bootstrap"
        child_process.execSync(build_ninja_command, { cwd: ninja_source_dir, stdio: [0, 1, 2] })
        fs.renameSync(path.join(ninja_source_dir, 'ninja'), ninja_bin_output)
        console.log('ninja binary is ready: ', ninja_bin_output)
    }

    // sanity check to make sure the binary actually runs. Used for Linux. Too many variants
    function test_ninja_compatible(binary_path) {
        var version;
        try {
            version = child_process.execSync(JSON.stringify(binary_path) + ' --version', {
                encoding: 'utf8',
                stdio: ['pipe', 'pipe', 'ignore'] // execSync outputs to stdout even if we catch the error. Silent it here
            }).trim();
        } catch (e) {
            console.log('ninja not compatible?', String(e))
            return false;
        }
        return version === vendor_ninja_version;
    };


    var ninja_os_path = path.join(ninja_build_dir, 'ninja' + sys_extension)
    if (fs.existsSync(ninja_bin_output) && test_ninja_compatible(ninja_bin_output)) {
        console.log("ninja binary is already cached: ", ninja_bin_output)
    }
    else if (fs.existsSync(ninja_os_path)) {
        fs.renameSync(ninja_os_path, ninja_bin_output)
        if (test_ninja_compatible(ninja_bin_output)) {
            console.log("ninja binary is copied from pre-distribution")
        } else {
            build_ninja()
        }
    } else {
        build_ninja()
    }
}


/**
 * raise an exception if not matched
 */
function matchedCompilerExn() {
    var output = child_process.execSync('ocamlc.opt -v', { encoding: 'ascii' })
    if (output.indexOf("4.02.3") >= 0) {
        console.log(output)
        console.log("Use the compiler above")
    } else {
        console.log("No matched compiler found, may re-try")
        throw ""
    }
}
function tryToProvideOCamlCompiler() {
    try {
        if (process.env.BS_ALWAYS_BUILD_YOUR_COMPILER) {
            throw 'FORCED TO REBUILD'
        }
        matchedCompilerExn()
    } catch (e) {
        console.log('Build a local version of OCaml compiler, it may take a couple of minutes')
        try {
            child_process.execFileSync(path.join(__dirname, 'buildocaml.sh'))
        } catch (e) {
            console.log(e.stdout.toString());
            console.log(e.stderr.toString());
            console.log('Building a local version of the OCaml compiler failed, check the outut above for more information. A possible problem is that you don\'t have a compiler installed');
            throw e;
        }
        console.log('configure again with local ocaml installed')
        matchedCompilerExn()
        console.log("config finished")
    }
}

// copy all [*.sys_extension] files into [*.exe]
function copyBinToExe() {
    var indeed_windows_release = 0
    fs.readdirSync(lib_dir).forEach(function (f) {
        var last_index = f.lastIndexOf(sys_extension)
        if (last_index !== -1) {
            var new_file = f.slice(0, - sys_extension.length) + ".exe"
            build_util.poor_copy_sync(path.join(lib_dir, f), path.join(lib_dir, new_file));
            // we do have .win file which means windows npm release
            ++indeed_windows_release
        }

    })
    return indeed_windows_release > 1
}

function checkPrebuilt() {
    try {
        var version = child_process.execFileSync(path.join(lib_dir, 'bsc' + sys_extension), ['-v'])
        console.log("checkoutput:", String(version))
        return copyBinToExe()
    } catch (e) {
        console.log("No working prebuilt compiler")
        return false
    }
}



function non_windows_npm_release() {
    if (fs.existsSync(path.join(lib_dir, 'bsc.exe'))) {
        console.log('Found bsc.exe, assume it was already built')
        return true // already built before
    }
    if (checkPrebuilt()) {
        child_process.execSync(make + " libs && " + make + " install", root_dir_config)
    } else {
        tryToProvideOCamlCompiler()
        child_process.execSync(make + " world && " + make + " install", root_dir_config)
    }
}

var build_util = require('./build_util.js')

setUpNinja()
if (is_windows) {
    if (copyBinToExe()) {
        child_process.execFileSync(
            path.join(__dirname, 'win_build.bat'),
            { cwd: path.join(root_dir, 'jscomp'), stdio: [0, 1, 2] }
        )
        console.log("Installing")
        build_util.install()
    } else {
        // Cygwin
        console.log("It is on windows, but seems to be that you are building against master branch, so we are going to depend on cygwin on master")
        non_windows_npm_release()
    }
}
else {
    non_windows_npm_release()
}