nvim: add ufo folding plugin

.gitmodules

@@ -14,7 +14,6 @@
 # neovim plugins
 ################
 
-# auto close brackets and quotes
 [submodule "src/dot_local/share/nvim/site/pack/3pp/start/external_nvim-cmp"]
 	path = src/dot_local/share/nvim/site/pack/3pp/opt/external_nvim-cmp
 	url = https://github.com/hrsh7th/nvim-cmp.git
@@ -61,6 +60,17 @@
 [submodule "src/dot_local/share/nvim/site/pack/3pp/start/external_cmp_luasnip"]
 	path = src/dot_local/share/nvim/site/pack/3pp/opt/external_cmp_luasnip
 	url = https://github.com/saadparwaiz1/cmp_luasnip
+
+# auto-close brackets
 [submodule "src/dot_local/share/nvim/site/pack/3pp/opt/external_auto-pairs"]
 	path = src/dot_local/share/nvim/site/pack/3pp/opt/external_auto-pairs
 	url = https://github.com/jiangmiao/auto-pairs
+
+# code folding
+# coding.lua
+[submodule "src/dot_local/share/nvim/site/pack/3pp/opt/external_nvim-ufo"]
+	path = src/dot_local/share/nvim/site/pack/3pp/opt/external_nvim-ufo
+	url = https://github.com/kevinhwang91/nvim-ufo
+[submodule "src/dot_local/share/nvim/site/pack/3pp/opt/external_promise-async"]
+	path = src/dot_local/share/nvim/site/pack/3pp/opt/external_promise-async
+	url = https://github.com/kevinhwang91/promise-async

src/dot_config/nvim/lua/coding.lua

@@ -63,11 +63,6 @@ require 'nvim-treesitter.configs'.setup {
 	},
 }
 
--- code folding
-vim.wo.foldmethod = 'expr'
-vim.wo.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
-vim.wo.foldlevel = 99 -- unfold by default
-
 --------
 -- auto-pairs for brackets
 --------
@@ -200,18 +195,45 @@ local servers = {
 	},
 	nushell = {},
 }
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities.textDocument.foldingRange = {
+    dynamicRegistration = false,
+    lineFoldingOnly = true
+}
 for lsp, sv_settings in pairs(servers) do
 	-- defaults
 	local settings = {
 		on_attach = on_attach,
 		flags = {
 			debounce_text_changes = 150,
-		}
+		},
+		capabilities=capabilities,
 	}
 	for k, v in pairs(servers[lsp]) do settings[k] = v end
 	nvim_lsp[lsp].setup(settings)
 end
 
+--------
+-- code folding
+--
+-- useful binds include zM (close all folds), zA (recursively toggle fold), and zR (open all folds).
+-- see :h usr_28 for more information about folds.
+--------
+vim.cmd.packadd("promise-async")
+vim.cmd.packadd("nvim-ufo")
+local ufo = require("ufo")
+ufo.setup()
+vim.o.foldenable = true
+vim.o.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
+-- set to '1' to get a column with arrows for folds
+vim.o.foldcolumn = '0'
+vim.o.fillchars = [[eob: ,fold: ,foldopen:,foldsep: ,foldclose:]]
+vim.o.foldlevel = 99
+vim.o.foldlevelstart = 99
+keymap('zM', ufo.closeAllFolds)
+keymap('zR', ufo.openAllFolds)
+keymap('zm', ufo.closeFoldsWith)
+keymap('zr', ufo.openFoldsExceptKinds)
 
 ------
 -- completions

src/dot_config/nvim/lua/theme.lua

@@ -34,6 +34,8 @@ local styles = colorbuddy.styles
 Group.new("Normal", colors.noir_4, colors.none, nil)
 Group.new("StatusLine", colors.noir_4, colors.none, styles.bold)
 Group.link("MsgArea", groups.Normal)
+Group.link("FoldColumn", groups.Normal)
+Group.link("Folded", groups.Normal)
 Group.new("StatusLineNC", colors.noir_7, colors.none)
 Group.link("Gutter", groups.normal)
 Group.new("LineNr", colors.noir_8, colors.none, nil)

src/dot_local/share/nvim/site/pack/3pp/opt/external_nvim-ufo

@@ -0,0 +1 @@
+Subproject commit 522d719d421fc42b95577d9624048d8348d326ea

src/dot_local/share/nvim/site/pack/3pp/opt/external_promise-async

@@ -0,0 +1 @@
+Subproject commit 119e8961014c9bfaf1487bf3c2a393d254f337e2