Support 'gleam format' as Gleam fixer (#4710)

autoload/ale/fix/registry.vim

@@ -291,6 +291,11 @@ let s:default_registry = {
 \       'suggested_filetypes': ['solidity'],
 \       'description': 'Fix Solidity files with forge fmt.',
 \   },
+\   'gleam_format': {
+\       'function': 'ale#fixers#gleam_format#Fix',
+\       'suggested_filetypes': ['gleam'],
+\       'description': 'Fix Gleam files with gleam format.',
+\   },
 \   'gofmt': {
 \       'function': 'ale#fixers#gofmt#Fix',
 \       'suggested_filetypes': ['go'],

autoload/ale/fixers/gleam_format.vim

@@ -0,0 +1,19 @@
+" Author: Jonathan Palardt https://github.com/jpalardy
+" Description: Integration of 'gleam format' with ALE.
+
+call ale#Set('gleam_format_executable', 'gleam')
+
+function! ale#fixers#gleam_format#GetExecutable(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'gleam_format_executable')
+
+    return ale#Escape(l:executable)
+endfunction
+
+function! ale#fixers#gleam_format#Fix(buffer) abort
+    let l:executable = ale#fixers#gleam_format#GetExecutable(a:buffer)
+
+    return {
+    \   'command': l:executable . ' format %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction