Merge pull request #801 from okonet/simplify

feat: use diff/apply only with partially staged files

README.md

@@ -60,13 +60,18 @@ Usage: lint-staged [options]
 
 Options:
   -V, --version                      output the version number
-  --allow-empty                      allow empty commits when tasks undo all staged changes (default: false)
+  --allow-empty                      allow empty commits when tasks revert all staged changes
+                                     (default: false)
   -c, --config [path]                path to configuration file
   -d, --debug                        print additional debug information (default: false)
-  -p, --concurrent <parallel tasks>  the number of tasks to run concurrently, or false to run tasks serially (default: true)
+  --no-stash                         disable the backup stash, and do not revert in case of
+                                     errors
+  -p, --concurrent <parallel tasks>  the number of tasks to run concurrently, or false to run
+                                     tasks serially (default: true)
   -q, --quiet                        disable lint-staged’s own console output (default: false)
   -r, --relative                     pass relative filepaths to tasks (default: false)
-  -x, --shell                        skip parsing of tasks for better shell support (default: false)
+  -x, --shell                        skip parsing of tasks for better shell support (default:
+                                     false)
   -h, --help                         output usage information
 ```
 
@@ -79,6 +84,7 @@ Options:
   - `false`: Run all tasks serially
   - `true` (default) : _Infinite_ concurrency. Runs as many tasks in parallel as possible.
   - `{number}`: Run the specified number of tasks in parallel, where `1` is equivalent to `false`.
+- **`--no-stash`**: By default a backup stash will be created before running the tasks, and all task modifications will be reverted in case of an error. This option will disable creating the stash, and instead leave all modifications in the index when aborting the commit.
 - **`--quiet`**: Supress all CLI output, except from tasks.
 - **`--relative`**: Pass filepaths relative to `process.cwd()` (where `lint-staged` runs) to tasks. Default is `false`.
 - **`--shell`**: By default linter commands will be parsed for speed and security. This has the side-effect that regular shell scripts might not work as expected. You can skip parsing of commands with this option.
@@ -168,7 +174,7 @@ Pass arguments to your commands separated by space as you would do in the shell.
 
 ## Running multiple commands in a sequence
 
-You can run multiple commands in a sequence on every glob. To do so, pass an array of commands instead of a single one. This is useful for running autoformatting tools like `eslint --fix` or `stylefmt` but can be used for any arbitrary sequences. 
+You can run multiple commands in a sequence on every glob. To do so, pass an array of commands instead of a single one. This is useful for running autoformatting tools like `eslint --fix` or `stylefmt` but can be used for any arbitrary sequences.
 
 For example:
 

bin/lint-staged.js

@@ -31,6 +31,7 @@ cmdline
   .option('--allow-empty', 'allow empty commits when tasks revert all staged changes', false)
   .option('-c, --config [path]', 'path to configuration file')
   .option('-d, --debug', 'print additional debug information', false)
+  .option('--no-stash', 'disable the backup stash, and do not revert in case of errors', false)
   .option(
     '-p, --concurrent <parallel tasks>',
     'the number of tasks to run concurrently, or false to run tasks serially',
@@ -71,6 +72,7 @@ const options = {
   configPath: cmdline.config,
   debug: !!cmdline.debug,
   maxArgLength: getMaxArgLength() / 2,
+  stash: !!cmdline.stash, // commander inverts `no-<x>` flags to `!x`
   quiet: !!cmdline.quiet,
   relative: !!cmdline.relative,
   shell: !!cmdline.shell

lib/file.js

@@ -4,25 +4,10 @@ const debug = require('debug')('lint-staged:file')
 const fs = require('fs')
 const { promisify } = require('util')
 
-const fsAccess = promisify(fs.access)
 const fsReadFile = promisify(fs.readFile)
 const fsUnlink = promisify(fs.unlink)
 const fsWriteFile = promisify(fs.writeFile)
 
-/**
- * Check if a file exists. Returns the filename if exists.
- * @param {String} filename
- * @returns {String|Boolean}
- */
-const exists = async filename => {
-  try {
-    await fsAccess(filename)
-    return filename
-  } catch {
-    return false
-  }
-}
-
 /**
  * Read contents of a file to buffer
  * @param {String} filename
@@ -44,21 +29,19 @@ const readFile = async (filename, ignoreENOENT = true) => {
 }
 
 /**
- * Unlink a file if it exists
+ * Remove a file
  * @param {String} filename
  * @param {Boolean} [ignoreENOENT=true] — Whether to throw if the file doesn't exist
  */
 const unlink = async (filename, ignoreENOENT = true) => {
-  if (filename) {
-    debug('Unlinking file `%s`', filename)
-    try {
-      await fsUnlink(filename)
-    } catch (error) {
-      if (ignoreENOENT && error.code === 'ENOENT') {
-        debug("File `%s` doesn't exist, ignoring...", filename)
-      } else {
-        throw error
-      }
+  debug('Removing file `%s`', filename)
+  try {
+    await fsUnlink(filename)
+  } catch (error) {
+    if (ignoreENOENT && error.code === 'ENOENT') {
+      debug("File `%s` doesn't exist, ignoring...", filename)
+    } else {
+      throw error
     }
   }
 }
@@ -74,7 +57,6 @@ const writeFile = async (filename, buffer) => {
 }
 
 module.exports = {
-  exists,
   readFile,
   unlink,
   writeFile