neovim: add custom gitcommit completion source

nvim/lua/plugins/autocompletion.lua

@@ -160,9 +160,11 @@ return {
         },
       })
 
+      require('user.cmp-nvim.gitcommit')
       cmp.setup.filetype('gitcommit', {
         sources = cmp.config.sources({
           { name = 'git' },
+          { name = 'gitcommit' },
         }, {
           { name = 'buffer' },
         }),

nvim/lua/user/cmp-nvim/gitcommit.lua

@@ -0,0 +1,63 @@
+local cc = {
+  {
+    label = 'build',
+    documentation = 'Changes that affect the build system or external dependencies',
+  },
+  {
+    label = 'chore',
+    documentation = 'Other changes that dont modify src or test files',
+  },
+  {
+    label = 'ci',
+    documentation = 'Changes to our CI configuration files and scripts',
+  },
+  {
+    label = 'docs',
+    documentation = 'Documentation only changes',
+  },
+  {
+    label = 'feat',
+    documentation = 'A new feature',
+  },
+  {
+    label = 'fix',
+    documentation = 'A bug fix',
+  },
+  {
+    label = 'perf',
+    documentation = 'A code change that improves performance',
+  },
+  {
+    label = 'refactor',
+    documentation = 'A code change that neither fixes a bug nor adds a feature',
+  },
+  {
+    label = 'style',
+    documentation = 'Changes that do not affect the meaning of the code',
+  },
+  {
+    label = 'test',
+    documentation = 'Adding missing tests or correcting existing tests',
+  },
+}
+
+local items = {}
+for k, v in ipairs(cc) do
+  items[k] = {
+    label = v.label,
+    kind = require('cmp').lsp.CompletionItemKind.Keyword,
+    documentation = v.documentation,
+  }
+end
+
+local source = {}
+
+function source:is_available()
+  return vim.bo.filetype == 'gitcommit'
+end
+
+function source:complete(request, callback)
+  callback(items)
+end
+
+require('cmp').register_source('gitcommit', source)