Add systemdlint support

Signed-off-by: Antonin Godard <[email protected]>

README.md

@@ -178,6 +178,7 @@ Other dedicated linters that are built-in are:
 | [statix check][33]                 | `statix`               |
 | [stylelint][29]                    | `stylelint`            |
 | [Solhint][solhint]                 | `solhint`              |
+| [systemdlint][systemdlint]         | `systemdlint`          |
 | [typos][typos]                     | `typos`                |
 | [Nagelfar][nagelfar]               | `nagelfar`             |
 | [Vala][vala-lint]                  | `vala_lint`            |
@@ -493,3 +494,4 @@ busted tests/
 [opa_check]: https://www.openpolicyagent.org/
 [regal]: https://github.com/StyraInc/regal
 [vala-lint]: https://github.com/vala-lang/vala-lint
+[systemdlint]: https://github.com/priv-kweihmann/systemdlint

lua/lint/linters/systemdlint.lua

@@ -0,0 +1,22 @@
+-- path/to/file:line:severity:code:message
+local pattern = '([^:]+):(%d+):(%a+):(.+):(.+)'
+local groups = { 'file', 'lnum', 'severity', 'code', 'message' }
+local severity_map = {
+  ['error'] = vim.diagnostic.severity.ERROR,
+  ['warning'] = vim.diagnostic.severity.WARN,
+  ['info'] = vim.diagnostic.severity.INFO,
+}
+
+return {
+  cmd = 'systemdlint',
+  stdin = false,
+  args = {
+    '--messageformat={path}:{line}:{severity}:{id}:{msg}',
+  },
+  ignore_exitcode = true,
+  stream = 'stderr',
+  parser = require('lint.parser').from_pattern(
+    pattern, groups, severity_map,
+    { ['source'] = 'systemdlint' }
+  ),
+}

tests/systemdlint_spec.lua

@@ -0,0 +1,53 @@
+describe('linter.systemdlint', function()
+  it('can parse the output', function()
+    local parser = require('lint.linters.systemdlint').parser
+    local bufnr = vim.uri_to_bufnr('file:///foo.service')
+    local result = parser([[
+/foo.service:1:error:ExecNotFound:Command referenced not found
+/foo.service:2:info:NoFailureCheck:Return-code check is disabled. Errors are not reported
+/foo.service:3:warning:ReferencedUnitNotFound:The Unit 'bar.service' referenced was not found in filesystem
+]], bufnr)
+
+  assert.are.same(3, #result)
+
+  local expected_error = {
+    code = 'ExecNotFound',
+    source = 'systemdlint',
+    message = 'Command referenced not found',
+    lnum = 0,
+    col = 0,
+    end_lnum = 0,
+    end_col = 0,
+    severity = vim.diagnostic.severity.ERROR,
+    user_data = { lsp = { code = 'ExecNotFound' } },
+  }
+  assert.are.same(expected_error, result[1])
+
+  local expected_info = {
+    code = 'NoFailureCheck',
+    source = 'systemdlint',
+    message = 'Return-code check is disabled. Errors are not reported',
+    lnum = 1,
+    col = 0,
+    end_lnum = 1,
+    end_col = 0,
+    severity = vim.diagnostic.severity.INFO,
+    user_data = { lsp = { code = 'NoFailureCheck' } },
+  }
+  assert.are.same(expected_info, result[2])
+
+  local expected_warning = {
+    code = 'ReferencedUnitNotFound',
+    source = 'systemdlint',
+    message = 'The Unit \'bar.service\' referenced was not found in filesystem',
+    lnum = 2,
+    col = 0,
+    end_lnum = 2,
+    end_col = 0,
+    severity = vim.diagnostic.severity.WARN,
+    user_data = { lsp = { code = 'ReferencedUnitNotFound' } },
+  }
+  assert.are.same(expected_warning, result[3])
+
+  end)
+end)