feat: change nvim completion engine

BREAKING: now using hrsh7th/nvim-cmp, because nvim-compe has been
deprecated

.config/nvim/init.lua

@@ -13,7 +13,7 @@ require("statusline")   -- ./lua/statusline.lua
 require("polyjuice")    -- ~/.local/src/polyjuice/lua/polyjuice.lua
 
 -- auto complete
-require("plugin.compe") -- ./lua/plugin/compe.lua
+require("plugin.cmp")   -- ./lua/plugin/cmp.lua
 
 -- treesitter
 require("plugin.treesitter")    -- ./lua/plugin/treesitter.lua

.config/nvim/lua/plugin/cmp.lua

@@ -0,0 +1,81 @@
+-- Author        : swytch
+-- Created       : Saturday Sept. 11, 2021 22:12:33 CET
+-- License       : GPLv3
+-- Description   : cmp plugin config file
+
+local cmp = require("cmp")
+local luasnip = require("luasnip")
+
+local t = function(str)
+        return vim.api.nvim_replace_termcodes(str, true, true, true)
+end
+
+local check_backspace = function()
+        local line, col = unpack(vim.api.nvim_win_get_cursor(0))
+        return col ~= 0 and
+                vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:
+                        sub(col, col):match('%s') == nil
+end
+
+cmp.setup {
+        completion = {
+                autocomplete = false
+        },
+        sources = {
+                { name = "path" },
+                { name = "buffer" },
+                { name = "nvim_lsp" },
+                { name = "nvim_lua" },
+                { name = "treesitter" },
+                { name = "calc" },
+                { name = "spell" },
+        },
+        formatting = {
+                format = function(entry, vim_item)
+                        vim_item.menu = ({
+                                nvim_lsp        = "[lsp]",
+                                nvim_lua        = "[nvim]",
+                                path            = "[path]",
+                                buffer          = "[buff]",
+                                calc            = "[calc]",
+                                spell           = "[spel]",
+                                treesitter      = "[tree]",
+                        })[entry.source.name]
+                        return vim_item
+                end,
+        },
+        snippet = {
+                expand = function(args)
+                        require("luasnip").lsp_expand(args.body)
+                end,
+        },
+        mapping = {
+                ["<C-d>"] = cmp.mapping.scroll_docs(-4),
+                ["<C-f>"] = cmp.mapping.scroll_docs(4),
+                ["<C-e>"] = cmp.mapping.close(),
+                ["<CR>"] = cmp.mapping.confirm({
+                        behavior = cmp.ConfirmBehavior.Replace,
+                        select = true,
+                }),
+                ["<Tab>"] = cmp.mapping(function(fallback)
+                        if vim.fn.pumvisible() == 1 then
+                                vim.fn.feedkeys(t "<C-n>", "n")
+                        elseif luasnip.expand_or_jumpable() then
+                                luasnip.expand_or_jump()
+                        elseif check_backspace() then
+                                cmp.complete()
+                        else
+                                fallback()
+                        end
+                end, { "i", "s" }),
+                ["<S-Tab>"] = cmp.mapping(function(fallback)
+                        if vim.fn.pumvisible() == 1 then
+                                vim.fn.feedkeys(t "<C-p>", "n")
+                        elseif luasnip.jumpable(-1) then
+                                luasnip.jump(-1)
+                        else
+                                fallback()
+                        end
+                end, { "i", "s" }),
+        }
+}

.config/nvim/lua/plugin/compe.lua

@@ -1,73 +0,0 @@
--- Author        : swytch
--- Created       : Tuesday Mar 18, 2021 23:12:25 CET
--- License       : GPLv3
--- Description   : compe plugin config file
-
-require("compe").setup {
-        enabled                 = true;
-        autocomplete            = false;
-        debug                   = false;
-        min_length              = 1;
-        preselect               = "enable";
-        throttle_time           = 80;
-        source_timeout          = 200;
-        incomplete_delay        = 400;
-        max_abbr_width          = 100;
-        max_kind_width          = 10;
-        max_menu_width          = 100;
-        documentation           = true;
-
-        source = {
-                path            = {menu = "  [path]"},
-                buffer          = {menu = "  [buff]"},
-                calc            = {menu = "  [calc]"},
-                -- vsnip        = {menu = "  [snip]"},
-                nvim_lsp        = {menu = "  [LSP]"},
-                nvim_lua        = {menu = "  [nvim]"},
-                spell           = {menu = "  [spel]"},
-                tags            = false,
-                treesitter      = {menu = "  [tree]"},
-        };
-}
-
-local t = function(str)
-        return vim.api.nvim_replace_termcodes(str, true, true, true)
-end
-
-local check_back_space = function()
-        local col = vim.fn.col('.') - 1
-        if col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') then
-                return true
-        else
-                return false
-        end
-end
-
--- Use (s-)tab to:
---- move to prev/next item in completion menuone
---- jump to prev/next snippet's placeholder
-_G.tab_complete = function()
-        if vim.fn.pumvisible() == 1 then
-                return t "<C-n>"
---      elseif vim.fn.call("vsnip#available", {1}) == 1 then
---              return t "<Plug>(vsnip-expand-or-jump)"
-        elseif check_back_space() then
-                return t "<Tab>"
-        else
-                return vim.fn['compe#complete']()
-        end
-end
-_G.s_tab_complete = function()
-        if vim.fn.pumvisible() == 1 then
-                return t "<C-p>"
---      elseif vim.fn.call("vsnip#jumpable", {-1}) == 1 then
---              return t "<Plug>(vsnip-jump-prev)"
-        else
-                return t "<S-Tab>"
-        end
-end
-
-vim.api.nvim_set_keymap("i", "<Tab>", "v:lua.tab_complete()", {expr = true})
-vim.api.nvim_set_keymap("s", "<Tab>", "v:lua.tab_complete()", {expr = true})
-vim.api.nvim_set_keymap("i", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
-vim.api.nvim_set_keymap("s", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})

.config/nvim/lua/plugins.lua

@@ -55,7 +55,19 @@ return require("packer").startup(function()
         }
 
         -- auto completion
-        use "hrsh7th/nvim-compe"
+        use {
+                "hrsh7th/nvim-cmp",
+                requires = {
+                        "L3MON4D3/LuaSnip",
+                        "hrsh7th/cmp-nvim-lsp",
+                        "hrsh7th/cmp-nvim-lua",
+                        "hrsh7th/cmp-buffer",
+                        "hrsh7th/cmp-path",
+                        "hrsh7th/cmp-calc",
+                        "ray-x/cmp-treesitter",
+                        "f3fora/cmp-spell"
+                }
+        }
 
         -- display colors directly in editor
         use {
@@ -63,4 +75,6 @@ return require("packer").startup(function()
                 cmd = "ColorizerToggle"
         }
 
+        -- ens
+        use "whonore/Coqtail"
 end)