feat(picker): Add file history picker

lua/jj/picker.lua

@@ -10,6 +10,15 @@ local utils = require("jj.utils")
 --- @field change string The type of change in the file
 --- @field diff_cmd string The command to get the diff of the file
 
+--- @class jj.picker.log_line
+--- @field symbol string The symbol of the log entry
+--- @field rev string The revision of the log entry
+--- @field author string The author of the log entry
+--- @field time string The time of the log entry
+--- @field commit_id string The commit id of the log entry
+--- @field description string The description of the log entry
+--- @field diff_cmd string The command to get the diff of the file
+
 local M = {
 	--- @type jj.picker.config
 	config = {
@@ -73,4 +82,83 @@ function M.status()
 	end
 end
 
+---Parse jj log oneline
+---@param file_path string The path of the file to log
+---@return jj.picker.log_line[]|nil A list of log lines or nil if not in a jj repo
+local function log_history(file_path)
+	local format =
+		"jj log %s -r 'all()' -T builtin_log_oneline --config 'template-aliases.\"format_timestamp(timestamp)\"=timestamp'"
+	local output, ok = utils.execute_command(string.format(format, file_path))
+	if not ok then
+		return
+	end
+
+	if type(output) ~= "string" then
+		return utils.notify(string.format("Could not get log output for file %s", file_path), vim.log.levels.ERROR)
+	end
+
+	local file_history = {}
+	local lines = vim.split(output, "\n", { trimempty = true })
+
+	for _, line in ipairs(lines) do
+		-- Skip root line and elided revisions
+		local not_empty = line:match("%S")
+		local root = line:match("root%(%)")
+		local elided = line:match("~%s*%(elided revisions%)%s*$")
+
+		if not_empty and not root and not elided then
+			-- Pattern: [symbol] [rev] [author] [time] [commit_id] [description]
+			-- Example: @  w ngou0210 10 seconds ago e (no description set)
+			-- Split at the first space after the symbol
+			local first_space = line:find("%s")
+			if not first_space then
+				goto continue
+			end
+			-- Split the line into parts
+			-- The first part is the symbol, the second part is the revision, the third part is the author,
+			local symbol = line:sub(1, first_space - 1)
+			local rest_of_line = line:sub(first_space + 1)
+
+			local rev, author, time_part, commit_id, description =
+				rest_of_line:match("^%s*(%S+)%s+(%S+)%s+(.-)%s+([%w]+)%s+(.*)$")
+
+			-- It does not make much sense to show the current commit
+			if symbol and symbol ~= "@" then
+				if rev and author and commit_id then
+					table.insert(file_history, {
+						symbol = symbol or "",
+						rev = rev,
+						author = author,
+						time = time_part or "",
+						commit_id = commit_id,
+						description = description or "",
+						text = line,
+						diff_cmd = string.format("jj diff %s -r %s --stat --git", file_path, rev),
+					})
+				end
+			end
+		end
+		::continue::
+	end
+
+	return file_history
+end
+
+function M.file_history()
+	-- Ensure jj is installed
+	if not utils.ensure_jj() then
+		return
+	end
+
+	local file = vim.fn.expand("%:p")
+
+	local log_lines = log_history(file)
+
+	if M.config.snacks then
+		require("jj.picker.snacks").file_log_history(M.config, log_lines)
+	else
+		return utils.notify("No `Picker` enabled", vim.log.levels.INFO)
+	end
+end
+
 return M