Dhall language support (fixes #2820)

autoload/ale/dhall.vim

@@ -0,0 +1,21 @@
+" Author: toastal <toastal@protonmail.com>
+" Description: Functions for working with Dhall’s executable
+
+call ale#Set('dhall_executable', 'dhall')
+call ale#Set('dhall_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('dhall_options', '')
+
+function! ale#dhall#GetExecutable(buffer) abort
+    return ale#Escape(ale#Var(a:buffer, 'dhall_executable'))
+endfunction
+
+function! ale#dhall#GetExecutableWithOptions(buffer) abort
+    let l:executable = ale#dhall#GetExecutable(a:buffer)
+
+    return l:executable
+    \   . ale#Pad(ale#Var(a:buffer, 'dhall_options'))
+endfunction
+
+function! ale#dhall#GetCommand(buffer) abort
+    return '%e ' . ale#Pad(ale#Var(a:buffer, 'dhall_options'))
+endfunction

autoload/ale/fix/registry.vim

@@ -32,6 +32,21 @@ let s:default_registry = {
 \       'suggested_filetypes': ['d'],
 \       'description': 'Fix D files with dfmt.',
 \   },
+\   'dhall-format': {
+\       'function': 'ale#fixers#dhall_format#Fix',
+\       'suggested_filetypes': ['dhall'],
+\       'description': 'Standard code formatter for the Dhall language',
+\   },
+\   'dhall-freeze': {
+\       'function': 'ale#fixers#dhall_freeze#Freeze',
+\       'suggested_filetypes': ['dhall'],
+\       'description': 'Add integrity checks to remote import statements of an expression for the Dhall language',
+\   },
+\   'dhall-lint': {
+\       'function': 'ale#fixers#dhall_lint#Fix',
+\       'suggested_filetypes': ['dhall'],
+\       'description': 'Standard code formatter for the Dhall language and removing dead code',
+\   },
 \   'fecs': {
 \       'function': 'ale#fixers#fecs#Fix',
 \       'suggested_filetypes': ['javascript', 'css', 'html'],

autoload/ale/fixers/dhall_format.vim

@@ -0,0 +1,14 @@
+" Author: toastal <toastal@protonmail.com>
+" Description: Dhall’s built-in formatter
+
+function! ale#fixers#dhall_format#Fix(buffer) abort
+    let l:executable = ale#dhall#GetExecutableWithOptions(a:buffer)
+    let l:command = l:executable
+    \   . ' format'
+    \   . ' --inplace %t'
+
+    return {
+    \   'command': l:command,
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/fixers/dhall_freeze.vim

@@ -0,0 +1,18 @@
+" Author: toastal <toastal@protonmail.com>
+" Description: Dhall’s package freezing
+
+call ale#Set('dhall_freeze_options', '')
+
+function! ale#fixers#dhall_freeze#Freeze(buffer) abort
+    let l:executable = ale#dhall#GetExecutableWithOptions(a:buffer)
+    let l:command = l:executable
+    \   . ' freeze'
+    \   . ale#Pad(ale#Var(a:buffer, 'dhall_freeze_options'))
+    \   . ' --inplace %t'
+
+
+    return {
+    \   'command': l:command,
+    \   'read_temporary_file': 1,
+    \}
+endfunction

autoload/ale/fixers/dhall_lint.vim

@@ -0,0 +1,14 @@
+" Author: toastal <toastal@protonmail.com>
+" Description: Dhall’s built-in linter/formatter
+
+function! ale#fixers#dhall_lint#Fix(buffer) abort
+    let l:executable = ale#dhall#GetExecutableWithOptions(a:buffer)
+    let l:command = l:executable
+    \   . ' lint'
+    \   . ' --inplace %t'
+
+    return {
+    \   'command': l:command,
+    \   'read_temporary_file': 1,
+    \}
+endfunction