feat(linter): add buf protobuf linter (#64)

Co-authored-by: xiaoshihou <xiaoshihou@tutamail.com>

Author: barrettruth

lua/guard-collection/linter/buf.lua

@@ -0,0 +1,17 @@
+return {
+  cmd = 'buf',
+  args = { 'lint', '--error-format=json' },
+  fname = true,
+  parse = require('guard.lint').from_json({
+    lines = true,
+    attributes = {
+      lnum = 'start_line',
+      col = 'start_column',
+      end_lnum = 'end_line',
+      end_col = 'end_column',
+      code = 'type',
+      message = 'message',
+    },
+    source = 'buf',
+  }),
+}

lua/guard-collection/linter/init.lua

@@ -1,4 +1,5 @@
 return {
+  buf = require('guard-collection.linter.buf'),
   checkmake = require('guard-collection.linter.checkmake'),
   ['clang-tidy'] = require('guard-collection.linter.clang-tidy'),
   codespell = require('guard-collection.linter.codespell'),

test/linter/buf_spec.lua

@@ -0,0 +1,25 @@
+describe('buf', function()
+  it('can lint', function()
+    local helper = require('test.linter.helper')
+    local ns = helper.namespace
+    local ft = require('guard.filetype')
+    ft('proto'):lint('buf')
+
+    local buf, diagnostics = helper.test_with('proto', {
+      [[syntax = "proto3"; message Foo { string bar = 1 }]],
+    })
+    assert.are.same({
+      {
+        bufnr = buf,
+        col = 48,
+        end_col = 48,
+        end_lnum = 0,
+        lnum = 0,
+        message = "syntax error: expecting ';'",
+        namespace = ns,
+        severity = 4,
+        source = 'buf',
+      },
+    }, diagnostics)
+  end)
+end)