refactor: make custom config flow much more flexible

Author: Konstantin Epishev

cli.js

@@ -5,10 +5,9 @@
  * A CLI tool to change the git hooks to commands from config
  */
 const {setHooksFromConfig} = require('./simple-git-hooks')
-const [configPath] = process.argv.slice(2)
 
 try {
-    setHooksFromConfig(process.cwd(), configPath)
+    setHooksFromConfig(process.cwd(), process.argv)
     console.log('[INFO] Successfully set all git hooks')
 } catch (e) {
     console.log('[ERROR], Was not able to set git hooks. Error: ' + e)

simple-git-hooks.js

@@ -131,10 +131,11 @@ function checkSimpleGitHooksInDependencies(projectRootPath) {
 /**
  * Parses the config and sets git hooks
  * @param {string} projectRootPath
- * @param {string} [configFileName]
+ * @param {string[]} [argv]
  */
-function setHooksFromConfig(projectRootPath=process.cwd(), configFileName='') {
-    const config = _getConfig(projectRootPath, configFileName)
+function setHooksFromConfig(projectRootPath=process.cwd(), argv=process.argv) {
+    const customConfigPath = _getCustomConfigPath(argv)
+    const config = _getConfig(projectRootPath, customConfigPath)
 
     if (!config) {
         throw('[ERROR] Config was not found! Please add `.simple-git-hooks.js` or `simple-git-hooks.js` or `.simple-git-hooks.json` or `simple-git-hooks.json` or `simple-git-hooks` entry in package.json.\r\nCheck README for details')
@@ -223,6 +224,20 @@ function _getPackageJson(projectPath = process.cwd()) {
     return { packageJsonContent: JSON.parse(packageJsonDataRaw), packageJsonPath: targetPackageJson }
 }
 
+/**
+ * Takes the first argument from current process argv and returns it
+ * Returns empty string when argument wasn't passed
+ * @param {string[]} [argv]
+ * @returns {string}
+ */
+function _getCustomConfigPath(argv=[]) {
+    const cmdIdx = argv.findIndex(val => val === 'simple-git-hooks')
+
+    if (cmdIdx === -1) return ''
+    
+    return argv[cmdIdx + 1] || ''
+}
+
 /**
  * Gets user-set command either from sources
  * First try to get command from .simple-pre-commit.json

simple-git-hooks.test.js

@@ -265,7 +265,7 @@ test('creates git hooks and removes unused but preserves specific git hooks', ()
 test('creates git hooks and removes unused but preserves specific git hooks', () => {
     createGitHooksFolder(projectWithCustomConfigurationFilePath)
 
-    spc.setHooksFromConfig(projectWithCustomConfigurationFilePath, 'git-hooks.js')
+    spc.setHooksFromConfig(projectWithCustomConfigurationFilePath, ['npx', 'simple-git-hooks', './git-hooks.js'])
     const installedHooks = getInstalledGitHooks(path.normalize(path.join(projectWithCustomConfigurationFilePath, '.git', 'hooks')))
     expect(JSON.stringify(installedHooks)).toBe(JSON.stringify({'pre-commit':`#!/bin/sh\nexit 1`, 'pre-push':`#!/bin/sh\nexit 1`}))