Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

3.1.0 - 2023-05-15

Added

Thank you messages for the different people who have helped improving Alejandra.
Pre-commit hooks with no prerequisites and instructions on how to update the pre-commit hooks.
A meta.mainProgram to our flake.nix.
Refreshed docs (updated moved links, integrations instructions, maintainer instructions).

Changed

The pre-commit option alejandra was renamed to alejandra-nix.
Upgraded dependencies to its latest version.
Blank lines are no longer added after comments in inherit.

Fixed

A syntax error in one of the pre-commit hooks.

3.0.0 - 2022-08-14

Added

Different levels of --quiet by repeating the -q flag, which makes Vim users have a better formatting experience by using :%!alejandra -qq to format the current buffer, specially when the file has syntax errors.
The possibility for companies to promote their business by placing an add at the end of Alejandra's terminal output, and thank you messages for the sponsors of the project.

You can obtain this benefits in @kamadorueda's sponsor page.
Thank you messages for the different people who have helped improving Alejandra.

Changed

Now big files are formatted first, making faster the formatting process when using many threads and when formatting a big file is slower than formatting all the other smaller files in the repository. For instance in Nixpkgs.
The CLI was simplified, removing the elements that people find less useful and polishing those that people use the most. The screen is not cleared anymore.
Upgraded dependencies to its latest version.

Fixed

The name displayed in the CLI application used to be alejandra_cli, now it is Alejandra.
Typos here and there.

2.0.0 - 2022-07-13

Added

A Style Guide, explaining why certain decisions were taken and why they are optimal from a productive Nix hacker point of view.

This guide is a work in progress, but the aim is that it eventually documents all of the aspects of the Nix language, so that we all have the peace of mind that comes from knowing that the style in Alejandra is the way it is for a reason.
Integration guides for: Neovim and GNU Emacs.
Published Alejandra as a crate, and added API documentation so other tools and integrations can be built in top of it.

Changed

Now running: $ alejandra - formats stdin, as POSIX suggests.
Comments are now indented by a multiple of 2 issues/294:

Previously (notice how some lines are indented with 3 and 5 spaces):
```
/*
 Bla bla bla.

 More bla:
   - Bla bla
   - Bla
 */
123
```
Now (all lines are indented to 2 and 4 spaces):
```
/*
Bla bla bla.

More bla:
  - Bla bla
  - Bla
*/
123
```
This makes it easier to write comments on major code editors, where a <TAB> (or <Shift>+<Tab>) moves the cursor/content to the next multiple of 2, and so indenting the comment contents to an odd number of spaces (like 3, 5, 7) is uncomfortable and unproductive.

This change also allows cooperation with other tools like EditorConfig, to further exercise good practices over a codebase.
Updated dependencies to its latest version.

Fixed

Empty lines in comments are now effectively empty, avoiding git from warning about extra whitespace: issues/314.

1.5.0 - 2022-06-22

Changed

Updated dependencies to its latest version.

1.4.0 - 2022-05-19

Added

A pre-commit hook (requires Alejandra to be installed in the host).

1.3.0 - 2022-05-09

Added

A pre-commit hook (requires Nix to be installed in the host).

Changed

Updated dependencies to its latest version.

1.2.0 - 2022-04-05

Added

A new i686-linux system to the flake.
apps.${system}.default to the Flake so that newer versions of Nix understand this instead of defaultApp.${system}.

Fixed

A typo in the documentation where aarch64-linux appeared twice and aarch64-darwin didn't.

Security

New CVEs were discovered in the third party dependencies of our website: https://kamadorueda.github.io/alejandra/ and so we updated those front-end dependencies to their latest version.

1.1.0 - 2022-03-10

Added

Emacs integration instructions.
A --quiet flag to the CLI which hide output details, disable the TUI and only print error messages.

Changed

Updated dependencies to its latest version.

1.0.0 - 2022-03-03

Added

NixOS installation instructions

Changed

The indentation for function applications was improved, so that indentation is now correct to the human eye in all cases:

-  name2 = function arg {
-    asdf = 1;
-  }
-  argument;
+  name2 =
+    function arg {
+      asdf = 1;
+    }
+    argument;

String interpolations ("${something}") now follow the same logic as parentheses ((something)), since ultimately, they are the same family of elements.

Parentheses handling logic was rewritten and by extension string interpolations as well.

- (
-   self: super: {
-     # ...
-   }
- )
+ (self: super: {
+   # ...
+ })

-      builtins.map (
-        pkg: {
-          name = "alejandra-${pkg.stdenv.targetPlatform.config}";
-          value = pkg;
-        }
-      )
+      builtins.map (pkg: {
+        name = "alejandra-${pkg.stdenv.targetPlatform.config}";
+        value = pkg;
+      })

-      (
-        fenix.combine [
-          fenix.latest.rustc
-          fenix.latest.toolchain
-          fenix.targets."wasm32-unknown-unknown".latest.rust-std
-        ]
-      )
+      (fenix.combine [
+        fenix.latest.rustc
+        fenix.latest.toolchain
+        fenix.targets."wasm32-unknown-unknown".latest.rust-std
+      ])

   pkgs.writeText "other-modules.json"
   (l.toJSON
-  (l.mapAttrs
-  (pname: subOutputs: let
-    pkg = subOutputs.packages."${pname}".overrideAttrs (old: {
-      buildScript = "true";
-      installMethod = "copy";
-    });
-  in "${pkg}/lib/node_modules/${pname}/node_modules")
-  outputs.subPackages))
+    (l.mapAttrs
+      (pname: subOutputs:
+        let
+          pkg = subOutputs.packages."${pname}".overrideAttrs (old: {
+            buildScript = "true";
+            installMethod = "copy";
+          });
+        in
+          "${pkg}/lib/node_modules/${pname}/node_modules")
+      outputs.subPackages))

-  (with a;
-  /*
-   comment
-   */
-  with b;
-  with c; {
-    a = 1;
-    b = 2;
-  })
+  (with a;
+    /*
+      comment
+      */
+    with b;
+    with c; {
+      a = 1;
+      b = 2;
+    })

In some cases it's possible to insert a newline after the opening element (either ( or ${) to force a tall formatting.

Removed

A few internal position counters, nothing visible from the outside.
The new features cost a little of runtime speed, but anyway we are still pretty fast. ⚡

0.7.0 - 2022-02-28

Added

Inline comments support in binary operators:

-      ++
-      # subsections go last
+      ++ # subsections go last

Inline comments support in with and assert expressions:

-  assert (libXft != null) -> libpng != null;
-  # probably a bug
-  assert stdenv.isDarwin -> libXaw != null;
-  # fails to link otherwise
+  assert (libXft != null) -> libpng != null; # probably a bug
+
+  assert stdenv.isDarwin -> libXaw != null; # fails to link otherwise
+

Inline comments support for if-then-else expressions:

                if y ? ${a}
-                then v x.${a} y.${a}
-                # both have attr, use merge func
-                else x.${a}
-              # only x has attr
+                then v x.${a} y.${a} # both have attr, use merge func
+                else x.${a} # only x has attr

Inline comments support for inherit expressions:

    inherit
      (callPackage ../development/tools/ocaml/ocamlformat {})
-      ocamlformat
-      # latest version
+      ocamlformat # latest version
       ocamlformat_0_11_0

Inline comments support for parenthesis expressions:

-        || (
-          # Accept {} for tests that are unsupported
+        || ( # Accept {} for tests that are unsupported
          isDerivation x
          && x ? meta.timeout
        );

Changed

Linux binaries now use mimalloc to provide much better performance when formatting Nixpkgs:
- x86_64-unknown-linux-gnu, 1.3x faster, from 0m10.639s to 0m8.381s
- x86_64-unknown-linux-musl, 15.8x faster, from 2m32.686s to 0m9.642s
- On QEMU aarch64-unknown-linux-musl, 4.6x faster, from 5m26s to 1m10s
- On QEMU armv6l-unknown-linux-musleabihf, 1.05x faster, from 8m7s to 7m41s
- On QEMU armv7l-unknown-linux-musleabihf, 1.15x faster, from 5m54s to 5m7s
- On QEMU i686-unknown-linux-musl, 1.07x faster, from 2m44s to 2m33s
After profiling the code as suggested by nnethercote's perf-book one critical path of Alejandra was identified an optimized, yielding huge performance boosts:
- x86_64-unknown-linux-gnu, 2.5x faster, from 0m8.381s to 0m3.410s
- x86_64-unknown-linux-musl, 2.3x faster, from 0m9.642s to 0m4.134s
- On QEMU aarch64-unknown-linux-musl, 2.4x faster, from 1m10s to 0m29s
- On QEMU armv6l-unknown-linux-musleabihf, 1.85x faster, from 7m41s to 4m8.399s
- On QEMU armv7l-unknown-linux-musleabihf, 1.88x faster, from 5m7s to 2m42.595s
- On QEMU i686-unknown-linux-musl, 1.65x faster, from 2m33s to 1m32.671s
In general this is an algorithmic improvement and therefore the following platforms should be faster as well by a similar ratio (not measured):
- aarch64-apple-darwin
- x86_64-apple-darwin
A --threads flag, so you can pick how many formatting threads to spawn. Defaults to the number of logical CPUs in your system.
Position counters were improved to offer an extra 1.13x speedup.

0.6.0 - 2022-02-25

Added

A --check flag, which makes Alejandra emit an exit code of 2 if any file was changed during formatting.

This means you can now use Alejandra in your CI/CD to ensure your code complies the Alejandra style.

Fixed

Multiline strings are handled as utf-8 correctly, preventing panics on utf-8 whitespace like:
```
  ''
  foo
\u{2002}bar
''
```
All inputs and dependencies were updated to their latest version

0.5.0 - 2022-02-23

Changed

Pattern matching lambdas now always have the comma after the argument:

-    depthLimit
+    depthLimit,
    /*
      If this option is true, an error will be thrown, if a certain given depth is exceeded
      */
-    ,

Pattern matching lambdas now support inline comments:

-  revision ? ""
-  # Specify revision for the options
+  revision ? "", # Specify revision for the options

If-then-else expressions are indented only when necessary:

-      then
-        {
-          crossDrv = overrideDerivation drv.crossDrv f;
-          nativeDrv = overrideDerivation drv.nativeDrv f;
-        }
+      then {
+        crossDrv = overrideDerivation drv.crossDrv f;
+        nativeDrv = overrideDerivation drv.nativeDrv f;
+      }

All inputs and dependencies were updated to their latest version.
A lot of code was refactored to improve maintainability.

0.4.0 - 2022-02-21

Added

A text user interface with a progress-bar and modern, colorful output (requires a tty).

When no tty is available or in non-interactive environments like a CI/CD or when piping alejandra to other commands ($ alejandra 2> file, $ alejandra | cat) the old school program output will be used.
A --exclude option to the CLI.
Refactors to the codebase. We now comply with clippy, a Rust linter.
A new structure to the codebase and link time optimizations.

Binaries were reduced in size by 15% with respect to the previous release (even with the added features), performance was improved in the reference machine from 45 seconds to 35 while formatting Nixpkgs on a single core.

Changed

The old school program output is now less verbose.

It prints only the path of files that were changed, and a summary of the number of errors and files changed during formatting.

Removed

The --debug flag in the CLI.

0.3.1 - 2022-02-20

Added

Prebuilt binaries for armv6l-linux, armv7l-linux, i686-linux.

Changed

Native aarch64-linux now use GNU libc instead of musl, this makes the binary run faster on multi-threaded hardware.

Fixed

All prebuilt binaries are now fully statically linked.
An attempt to subtract with overflow in some scenarios of a let-in expression.

0.3.0 - 2022-02-18

Changed

Let-in expressions are now indented in the top-level of a file.

Patterns avoid a new line after @:

-        args @
-        {
+        args @ {

-  }
-  @ inp:
+  } @ inp:

Attribute sets no longer have spaces before the first element or after the last:
```
- { b = 1; }
+ {b = 1;}
```
Pattern matching lambdas no longer have spaces before the first or after the last element:
```
- ({ ... }: _)
+ ({...}: _)
```
Ellipsis is no longer count as an element when spreading pattern matching lambdas:
```
-  {
-    pkgs,
-    ...
-  }:
+  {pkgs, ...}:
```

Pattern matching lambdas now follow the equal sign:

-  fnLocationRelative =
-    {
-      name,
-      value,
-    }:
+  fnLocationRelative = {
+    name,
+    value,
+  }:

with expressions now indent the new scope and follow the equal sign:

-    binPath =
-      with pkgs;
+    binPath = with pkgs;

Nested lambdas are now not indented:

  # comment
  a:
-   # comment
-   b:
-     _
+ # comment
+ b:
+   _

Brace-like elements after a pattern entry now follow the exclamation mark:

-  rootPoolProperties ?
-    {
-      autoexpand = "on";
-    },
+  rootPoolProperties ? {
+    autoexpand = "on";
+  },

0.2.0 - 2022-02-17

Added

A --version flag to the CLI.
Pre-built binaries for x86_64-linux and aarch64-linux.
Support for inline comments on lists, attr-sets, and let-in expressions.

Changed

Made the logic of the or-default (a or b) node to be equal to the binary operator (a $operator b). This increases consistency across the same family of elements.
Reduce 1 indentation level in let-in expressions, when the target expression is a parenthesis, attr-set, list, or string.
String interpolations in multi-line strings now have a nice-looking indentation.

Removed

Users freedom to insert newlines before the ? in pattern bindings (a ? b).

Inserting a newline after the ? is still possible.

This increases consistency on where to break a long pattern binding.
Space on empty containers ([], {}).

Fixed

A bug in the current position counter caused a small percentage of multiline comments in Nixpkgs to be unaligned by one character.

0.1.0 - 2022-02-14

Added

Initial version
A Changelog

0.0.0 - 2022-01-09

Added

The project :)

Files

CHANGELOG.md

Latest commit

History

CHANGELOG.md

File metadata and controls

Changelog

Unreleased

3.1.0 - 2023-05-15

Added

Changed

Fixed

3.0.0 - 2022-08-14

Added

Changed

Fixed

2.0.0 - 2022-07-13

Added

Changed

Fixed

1.5.0 - 2022-06-22

Changed

1.4.0 - 2022-05-19

Added

1.3.0 - 2022-05-09

Added

Changed

1.2.0 - 2022-04-05

Added

Fixed

Security

1.1.0 - 2022-03-10

Added

Changed

1.0.0 - 2022-03-03

Added

Changed

Removed

0.7.0 - 2022-02-28

Added

Changed

0.6.0 - 2022-02-25

Added

Fixed

0.5.0 - 2022-02-23

Changed

0.4.0 - 2022-02-21

Added

Changed

Removed

0.3.1 - 2022-02-20

Added

Changed

Fixed

0.3.0 - 2022-02-18

Changed

0.2.0 - 2022-02-17

Added

Changed

Removed

Fixed

0.1.0 - 2022-02-14

Added

0.0.0 - 2022-01-09

Added