Add a git show telescope extension

modules/home/nvim/lua/plugins/telescope.lua

@@ -17,9 +17,10 @@ return {
 			{ "<leader>f",  "<cmd>Telescope find_files<cr>",          desc = "Find Files" },
 			{ "<leader>F",  "<cmd>Telescope live_grep theme=ivy<cr>", desc = "Grep" },
 			{ "<leader>gl", "<cmd>Telescope git_commits<CR>",         desc = "Git log" },
-			{ "<leader>gh", "<cmd>Telescope git_bcommits<CR>",         desc = "Git history" },
+			{ "<leader>gh", "<cmd>Telescope git_bcommits<CR>",        desc = "Git history" },
 			{ "<leader>gb", "<cmd>Telescope git_branches<CR>",        desc = "Git branches" },
 			{ "<leader>gs", "<cmd>Telescope git_status<CR>",          desc = "Git status" },
+			{ "<leader>gc", "<cmd>Telescope git_show<CR>",            desc = "Show last commit" },
 		},
 		opts = function()
 			local actions = require "telescope.actions"
@@ -44,7 +45,7 @@ return {
 							["<A-k>"]  = actions.move_selection_previous,
 							["<A-j>"]  = actions.move_selection_next,
 							["<c-t>"]  = function()
-								local has_trouble, trouble_action = pcall(require, "trouble.providers.telescope")
+							local has_trouble, trouble_action = pcall(require, "trouble.providers.telescope")
 								if has_trouble then
 									trouble_action.open_with_trouble()
 								end
@@ -78,6 +79,7 @@ return {
 			local telescope = require("telescope")
 			telescope.setup(opts)
 			telescope.load_extension("fzf")
+			telescope.load_extension("git_show")
 		end,
 	}
 }

modules/home/nvim/lua/settings.lua

@@ -91,4 +91,3 @@ vim.cmd [[
 		autocmd TextYankPost * silent!lua require('vim.highlight').on_yank({higroup = 'Visual', timeout = 200}) 
 	augroup end
 ]]
-

modules/home/nvim/lua/telescope/_extensions/git_show.lua

@@ -0,0 +1,85 @@
+local previewers = require("telescope.previewers")
+local pickers = require("telescope.pickers")
+local finders = require("telescope.finders")
+local make_entry = require "telescope.make_entry"
+local utils = require "telescope.utils"
+local putils = require "telescope.previewers.utils"
+local from_entry = require "telescope.from_entry"
+local conf = require("telescope.config").values
+
+local function map(t, f)
+	local t1 = {}
+	for i = 1, #t do
+		t1[i] = f(t[i])
+	end
+	return t1
+end
+
+local git_file_show = function(opts)
+	return previewers.new_buffer_previewer {
+		title = "Git File Diff Preview",
+		get_buffer_by_name = function(_, entry)
+			return entry.value
+		end,
+
+		define_preview = function(self, entry, status)
+			if entry.status and (entry.status == "??" or entry.status == "A ") then
+				local p = from_entry.path(entry, true)
+				if p == nil or p == "" then
+					return
+				end
+				conf.buffer_previewer_maker(p, self.state.bufnr, {
+					bufname = self.state.bufname,
+					winid = self.state.winid,
+				})
+			else
+				putils.job_maker({ "git", "--no-pager", "show", opts.ref, entry.value }, self.state.bufnr, {
+					value = entry.value,
+					bufname = self.state.bufname,
+					cwd = opts.cwd,
+					callback = function(bufnr)
+						if vim.api.nvim_buf_is_valid(bufnr) then
+							putils.regex_highlighter(bufnr, "diff")
+						end
+					end,
+				})
+			end
+		end,
+	}
+end
+
+local git_show = function(opts)
+	opts = opts or { cwd = vim.loop.cwd() }
+	opts.ref = opts.ref or "HEAD"
+
+	local gen_new_finder = function()
+		local git_cmd = { "git", "show", "--name-status", '--pretty=tformat:', opts.ref }
+		local output  = utils.get_os_command_output(git_cmd, opts.cwd)
+		output        = map(output, function(x) return string.gsub(x, "\t", "  ", 1) end)
+
+		return finders.new_table {
+			results = output,
+			entry_maker = make_entry.gen_from_git_status(opts),
+		}
+	end
+
+	local initial_finder = gen_new_finder()
+	if not initial_finder then
+		return
+	end
+
+	pickers
+		.new(opts, {
+			prompt_title = "Git show " .. opts.ref,
+			finder = initial_finder,
+			previewer = git_file_show(opts),
+		})
+		:find()
+end
+
+return require("telescope").register_extension {
+	setup = function() end,
+	exports = {
+		git_show = git_show
+	},
+}