Add j2lint linter for Jinja2 templates (#5048)

Co-authored-by: Nicolas SCHMAUCH <nic.schmauch@i-0330135t.ac-bordeaux.fr>

ale_linters/jinja/j2lint.vim

@@ -0,0 +1,46 @@
+" Description: linter for jinja using j2lint
+
+call ale#Set('jinja_j2lint_executable', 'j2lint')
+call ale#Set('jinja_j2lint_options', '')
+call ale#Set('jinja_j2lint_use_global', get(g:, 'ale_use_global_executables', 0))
+call ale#Set('jinja_j2lint_auto_pipenv', 0)
+call ale#Set('jinja_j2lint_auto_poetry', 0)
+call ale#Set('jinja_j2lint_auto_uv', 0)
+
+function! ale_linters#jinja#j2lint#GetExecutable(buffer) abort
+    if (ale#Var(a:buffer, 'python_auto_pipenv') || ale#Var(a:buffer, 'jinja_j2lint_auto_pipenv'))
+    \ && ale#python#PipenvPresent(a:buffer)
+        return 'pipenv'
+    endif
+
+    if (ale#Var(a:buffer, 'python_auto_poetry') || ale#Var(a:buffer, 'jinja_j2lint_auto_poetry'))
+    \ && ale#python#PoetryPresent(a:buffer)
+        return 'poetry'
+    endif
+
+    if (ale#Var(a:buffer, 'python_auto_uv') || ale#Var(a:buffer, 'jinja_j2lint_auto_uv'))
+    \ && ale#python#UvPresent(a:buffer)
+        return 'uv'
+    endif
+
+    return ale#python#FindExecutable(a:buffer, 'jinja_j2lint', ['j2lint'])
+endfunction
+
+function! ale_linters#jinja#j2lint#GetCommand(buffer) abort
+    let l:executable = ale_linters#jinja#j2lint#GetExecutable(a:buffer)
+
+    let l:exec_args = l:executable =~? 'pipenv\|poetry\|uv$'
+    \   ? ' run j2lint'
+    \   : ''
+
+    return ale#Escape(l:executable) . l:exec_args
+    \   . ale#Pad(ale#Var(a:buffer, 'jinja_j2lint_options'))
+    \   . ' %t'
+endfunction
+
+call ale#linter#Define('jinja', {
+\   'name': 'j2lint',
+\   'executable': function('ale_linters#jinja#j2lint#GetExecutable'),
+\   'command': function('ale_linters#jinja#j2lint#GetCommand'),
+\   'callback': 'ale#handlers#unix#HandleAsError',
+\})