vim: add completion with plugin 'hrsh7th/nvim-cmp'

config/nvim/lua/user/plugins/completion.lua

@@ -0,0 +1,96 @@
+local config = function()
+  local cmp = require('cmp')
+
+  local mapping = function(mode)
+    return {
+      ['<c-n>'] = {
+        [mode] = function()
+          if cmp.visible() then
+            cmp.select_next_item { behavior = cmp.SelectBehavior.Select }
+          else
+            cmp.complete()
+          end
+        end,
+      },
+
+      ['<c-p>'] = {
+        [mode] = function()
+          if cmp.visible() then
+            cmp.select_prev_item { behavior = cmp.SelectBehavior.Select }
+          else
+            cmp.complete()
+          end
+        end,
+      },
+
+      ['<Down>'] = { [mode] = cmp.mapping.select_next_item { behavior = cmp.SelectBehavior.Select } },
+      ['<Up>'] = { [mode] = cmp.mapping.select_prev_item { behavior = cmp.SelectBehavior.Select } },
+
+      ['<c-f>'] = { [mode] = cmp.mapping.scroll_docs(4) },
+      ['<c-b>'] = { [mode] = cmp.mapping.scroll_docs(-4) },
+
+      ['<c-e>'] = { [mode] = cmp.mapping.abort() },
+      ['<c-y>'] = { [mode] = cmp.mapping.confirm { select = true } },
+      ['<Tab>'] = {
+        [mode] = function(fallback)
+          if cmp.visible() then
+            cmp.confirm { select = true }
+          else
+            fallback()
+          end
+        end,
+      },
+    }
+  end
+
+  cmp.setup {
+    mapping = mapping('i'),
+
+    sources = cmp.config.sources({
+      { name = 'nvim_lsp' },
+      { name = 'nvim_lua' },
+    }, {
+      { name = 'path' },
+      { name = 'buffer', keyword_length = 5 },
+    }),
+
+    formatting = (function()
+      local ok, lspkind = pcall(require, 'lspkind')
+      if not ok then return {} end
+      return {
+        format = lspkind.cmp_format {
+          mode = 'symbol_text',
+          menu = {
+            buffer   = "[buf]",
+            nvim_lsp = "[LSP]",
+            nvim_lua = "[lua]",
+            path     = "[path]",
+          },
+        },
+      }
+    end)(),
+
+    experimental = {
+      ghost_text = true,
+    },
+  }
+
+  cmp.setup.cmdline(':', {
+    mapping = mapping('c'),
+    sources = cmp.config.sources({
+      { name = 'path' }
+    }, {
+      { name = 'cmdline' }
+    })
+  })
+end
+
+return {
+  { 'hrsh7th/nvim-cmp', config = config },
+  'hrsh7th/cmp-nvim-lsp',
+  'hrsh7th/cmp-nvim-lua',
+  'hrsh7th/cmp-path',
+  'hrsh7th/cmp-buffer',
+  'onsails/lspkind-nvim',
+}
+