feat(cli): husky add will append command

Author: typicode

src/bin.ts

@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-import { add } from './commands/add'
+import { add } from './commands/set_add'
 import { install } from './commands/install'
 import { uninstall } from './commands/uninstall'
 import fs from 'fs'
@@ -27,6 +27,7 @@ function help() {
   husky init
   husky install [dir] (default: .husky)
   husky uninstall
+  husky set <file> [cmd]
   husky add <file> [cmd]
 
 Examples

src/commands/add.ts

@@ -1,6 +1,6 @@
 import fs from 'fs'
 import { PackageJson } from 'type-fest'
-import { add } from './add'
+import { set } from './set_add'
 import { install } from './install'
 
 const regex = /^[ ]+|\t+/m
@@ -34,5 +34,5 @@ export function init(isYarn2: boolean): void {
   install()
 
   // Add pre-commit sample
-  add('.husky/pre-commit', 'npm test')
+  set('.husky/pre-commit', 'npm test')
 }

src/commands/init.ts

@@ -0,0 +1,35 @@
+import fs from 'fs'
+import path from 'path'
+
+function data(cmd: string) {
+  return `#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+${cmd}
+`
+}
+
+function format(file: string): string {
+  return `${path.dirname(file)}${path.sep}${path.basename(file)}`
+}
+
+export function set(file: string, cmd: string): void {
+  const dir = path.dirname(file)
+  if (!fs.existsSync(dir)) {
+    throw new Error(`can't create hook, ${dir} directory doesn't exist`)
+  }
+
+  fs.writeFileSync(file, data(cmd), { mode: 0o0755 })
+
+  // Show "./file" instead of just "file"
+  console.log(`husky - created ${format(file)}`)
+}
+
+export function add(file: string, cmd: string): void {
+  if (fs.existsSync(file)) {
+    fs.appendFileSync(file, `${cmd}\n`)
+    console.log(`husky - updated ${format(file)}`)
+  } else {
+    set(file, cmd)
+  }
+}