feat: add alejandra (#56)

Author: HCHogan

README.md

@@ -7,6 +7,7 @@
 ## Formatters
 
 - `lsp` using `vim.lsp.buf.format`
+- [x] [alejandra](https://github.com/kamadorueda/alejandra)
 - [x] [autopep8](https://github.com/hhatto/autopep8)
 - [x] [black](https://github.com/psf/black)
 - [x] [biome](https://biomejs.dev)

lua/guard-collection/formatter.lua

@@ -6,6 +6,12 @@ M.lsp = {
   end,
 }
 
+M.alejandra = {
+  cmd = 'alejandra',
+  args = { '--quiet' },
+  stdin = true,
+}
+
 M.autopep8 = {
   cmd = 'autopep8',
   args = { '-' },

test/formatter/alejandra_spec.lua

@@ -0,0 +1,17 @@
+describe('alejandra', function()
+  it('can format', function()
+    -- pre-test setup
+    local ft = require('guard.filetype')
+    ft('nix'):fmt('alejandra')
+    -- Giving example input to the helper
+    -- the helper creates a new buffer with it, formats, and returns the formatted output
+    local formatted = require('test.formatter.helper').test_with('nix', {
+      -- The input code should somewhat reflect the filetype
+      [[{inputs={nixpkgs.url="github:NixOS/nixpkgs/nixos-unstable";};}]]
+    })
+    -- Show that the input is indeed formatted as intended
+    assert.are.same({
+      [[{inputs = {nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";};}]]
+    }, formatted)
+  end)
+end)

test/setup.sh

@@ -18,6 +18,11 @@ bin="$HOME/.local/bin"
 gh="https://github.com"
 mkdir -p $bin
 
+# alejandra
+wget -q $gh"/kamadorueda/alejandra/releases/download/4.0.0/alejandra-x86_64-unknown-linux-musl"
+mv ./alejandra-x86_64-unknown-linux-musl $bin/alejandra
+chmod +x $bin/alejandra
+
 # cbfmt
 wget -q $gh"/lukas-reineke/cbfmt/releases/download/v0.2.0/cbfmt_linux-x86_64_v0.2.0.tar.gz"
 tar -xvf cbfmt_linux-x86_64_v0.2.0.tar.gz