Add nvim-cmp completion source

.github/workflows/checks.yaml

@@ -12,7 +12,7 @@ jobs:
 
     - name: Install dependencies
       run: |
-        pip install --user codecov==2.0.15 covimerage==0.2.2 mwclient==0.10.0 flake8==3.7.8 coverage==4.5.4
+        pip install --user codecov==2.1.13 covimerage==0.2.2 mwclient==0.10.0 flake8==3.7.8 coverage==4.5.4
 
     - name: Run Python tests
       shell: bash

.gitignore

@@ -6,3 +6,4 @@ coverage.xml
 python_output
 browser_output
 codecov_validation
+doc/tags

README.md

@@ -9,8 +9,8 @@ provides:
 * filetype detection
 * improved syntax highlighting
 * page preview
-* semantic auto-completion of links and templates with a
-  [coc.nvim](https://github.com/neoclide/coc.nvim) source
+* semantic auto-completion of links and templates with
+  [coc.nvim](https://github.com/neoclide/coc.nvim) and [nvim-cmp](https://github.com/hrsh7th/nvim-cmp) sources
 * [UltiSnips](https://github.com/SirVer/ultisnips) snippets
 * `<plug>` mappings for text objects
 * matching pairs for [matchit.vim](https://github.com/vim/vim/blob/master/runtime/pack/dist/opt/matchit/doc/matchit.txt)
@@ -28,7 +28,20 @@ Auto-completion
 
 If [coc.nvim](https://github.com/neoclide/coc.nvim) is installed and configured
 properly, the completion source should work out-of-the-box for buffers of type
-`mediawiki`. Completion is triggered when typing inside double square brackets
+`mediawiki`.
+
+For [nvim-cmp](https://github.com/hrsh7th/nvim-cmp), add the `cmp_mediawiki`
+source:
+```lua
+require('vim-mediawiki.cmp_mediawiki')
+require('cmp').setup({
+    sources = {
+        {name = 'cmp_mediawiki'},
+    },
+})
+```
+
+Completion is triggered when typing inside double square brackets
 or double braces, and the minimum number of characters to type before
 completion can be configured. Multi-word completion is supported, so
 completions will be suggested when typing more than one word inside the

lua/vim-mediawiki/cmp_mediawiki.lua

@@ -0,0 +1,47 @@
+local source = {}
+
+function source:complete(cmp_params, cmp_callback)
+    local coc_options = {
+        bufnr = cmp_params.context.bufnr,
+        line = cmp_params.context.cursor_line,
+        colnr = cmp_params.context.cursor.col,
+    }
+
+    if vim.fn['coc#source#mediawiki#should_complete'](coc_options) == 0 then
+        cmp_callback(nil)
+        return
+    end
+
+    local function coc_callback(data)
+        local response = {
+            isIncomplete = false,
+            items = {}
+        }
+
+        for _, datum in ipairs(data) do
+            table.insert(response.items, {
+                insertText = datum.word,
+                label = datum.menu,
+                detail = datum.info,
+            })
+        end
+
+        cmp_callback(response)
+    end
+
+    vim.fn['coc#source#mediawiki#complete'](coc_options, coc_callback)
+end
+
+function source:is_available()
+    return vim.bo.filetype == 'mediawiki'
+end
+
+function source:resolve(completion_item, callback)
+    callback(completion_item)
+end
+
+function source:execute(completion_item, callback)
+    callback(completion_item)
+end
+
+require('cmp').register_source('cmp_mediawiki', source)