Add j2lint linter for Jinja2 templates

Author: Nicolas SCHMAUCH

ale_linters/jinja2/j2lint.vim

@@ -0,0 +1,21 @@
+" Description: linter for Jinja2 using j2lint
+
+call ale#Set('jinja2_j2lint_executable', 'j2lint')
+
+function! ale_linters#jinja2#j2lint#GetCommand(buffer) abort
+    let l:executable = ale#Var(a:buffer, 'jinja2_j2lint_executable')
+
+    let l:exec_args = l:executable =~? 'pipenv\|poetry\|uv$'
+    \   ? ' run j2lint'
+    \   : ''
+
+    return ale#Escape(l:executable) . l:exec_args
+    \   . ' %t'
+endfunction
+
+call ale#linter#Define('jinja2', {
+\   'name': 'j2lint',
+\   'executable': {b -> ale#Var(b, 'jinja2_j2lint_executable')},
+\   'command': function('ale_linters#jinja2#j2lint#GetCommand'),
+\   'callback': 'ale#handlers#unix#HandleAsError',
+\})

doc/ale-jinja.txt

@@ -8,5 +8,9 @@ djlint                                                       *ale-jinja-djlint*
 
 See |ale-html-djlint|
 
+===============================================================================
+j2lint                                                       *ale-jinja-j2lint*
+
+
 ===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale-supported-languages-and-tools.txt

@@ -336,6 +336,7 @@ Notes:
   * `xo`
 * Jinja
   * djlint
+  * j2lint
 * JSON
   * `VSCode JSON language server`
   * `biome`

doc/ale.txt

@@ -3634,6 +3634,7 @@ documented in additional help files.
     xo....................................|ale-javascript-xo|
   jinja...................................|ale-jinja-options|
     djlint................................|ale-jinja-djlint|
+    j2lint................................|ale-jinja-j2lint|
   json....................................|ale-json-options|
     biome.................................|ale-json-biome|
     clang-format..........................|ale-json-clangformat|

ftdetect/jinja2.vim

@@ -0,0 +1 @@
+au BufNewFile,BufRead *.j2 set filetype=jinja2

supported-tools.md

@@ -346,6 +346,7 @@ formatting.
   * [xo](https://github.com/sindresorhus/xo)
 * Jinja
   * [djlint](https://djlint.com/)
+  * [j2lint](https://github.com/aristanetworks/j2lint/)
 * JSON
   * [VSCode JSON language server](https://github.com/hrsh7th/vscode-langservers-extracted)
   * [biome](https://biomejs.dev/)

test/linter/test_j2lint.vader

@@ -0,0 +1,11 @@
+Before:
+  call ale#assert#SetUpLinterTest('jinja2', 'j2lint')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The j2lint executable should be configurable):
+  let g:ale_jinja2_j2lint_executable = '~/.local/bin/j2lint'
+
+  AssertLinter '~/.local/bin/j2lint',
+  \ ale#Escape('~/.local/bin/j2lint'). ' %t'