mu: use fmt-based apis in mu index/server and options

iostream is so 1998.

mu/mu-cmd-index.cc

@@ -26,7 +26,7 @@
 
 #include <errno.h>
 #include <string.h>
-#include <stdio.h>
+#include <cstdio>
 #include <signal.h>
 #include <unistd.h>
 
@@ -68,30 +68,34 @@ print_stats(const Indexer::Progress& stats, bool color)
 	MaybeAnsi col{color};
 	using Color = MaybeAnsi::Color;
 
-	std::cout << col.fg(Color::Yellow) << kars[++i % 4] << col.reset() << " indexing messages; "
-		  << "checked: " << col.fg(Color::Green) << stats.checked << col.reset()
-		  << "; updated/new: " << col.fg(Color::Green) << stats.updated << col.reset()
-		  << "; cleaned-up: " << col.fg(Color::Green) << stats.removed << col.reset();
+	mu_print("{}{}{} indexing messages; "
+		 "checked: {}{}{}; "
+		 "updated/new: {}{}{}; "
+		 "cleaned-up: {}{}{}",
+		 col.fg(Color::Yellow), kars[++i % 4], col.reset(),
+		 col.fg(Color::Green), static_cast<size_t>(stats.checked), col.reset(),
+		 col.fg(Color::Green), static_cast<size_t>(stats.updated), col.reset(),
+		 col.fg(Color::Green), static_cast<size_t>(stats.removed), col.reset());
 }
 
 Result<void>
 Mu::mu_cmd_index(Store& store, const Options& opts)
 {
 	const auto mdir{store.root_maildir()};
-	if (G_UNLIKELY(access(mdir.c_str(), R_OK) != 0))
+	if (G_UNLIKELY(::access(mdir.c_str(), R_OK) != 0))
 		return Err(Error::Code::File, "'{}' is not readable: {}",
-			   mdir.c_str(), g_strerror(errno));
+			   mdir, g_strerror(errno));
 
 	MaybeAnsi col{!opts.nocolor};
 	using Color = MaybeAnsi::Color;
 	if (!opts.quiet) {
 		if (opts.index.lazycheck)
-			std::cout << "lazily ";
+			mu_print("lazily ");
 
-		std::cout << "indexing maildir " << col.fg(Color::Green)
-			  << store.root_maildir() << col.reset() << " -> store "
-			  << col.fg(Color::Green) << store.path() << col.reset()
-			  << std::endl;
+		mu_println("indexing maildir {}{}{} -> "
+			   "store {}{}{}",
+			   col.fg(Color::Green), store.root_maildir(), col.reset(),
+			   col.fg(Color::Blue), store.path(), col.reset());
 	}
 
 	Mu::Indexer::Config conf{};
@@ -108,11 +112,11 @@ Mu::mu_cmd_index(Store& store, const Options& opts)
 		if (!opts.quiet)
 			print_stats(indexer.progress(), !opts.nocolor);
 
-		std::this_thread::sleep_for(std::chrono::milliseconds(250));
+		std::this_thread::sleep_for(std::chrono::milliseconds(100));
 
 		if (!opts.quiet) {
-			std::cout << "\r";
-			std::cout.flush();
+			mu_print("\r");
+			::fflush({});
 		}
 	}
 
@@ -120,7 +124,8 @@ Mu::mu_cmd_index(Store& store, const Options& opts)
 
 	if (!opts.quiet) {
 		print_stats(store.indexer().progress(), !opts.nocolor);
-		std::cout << std::endl;
+		mu_print("\n");
+		::fflush({});
 	}
 
 	return Ok();

mu/mu-cmd-server.cc

@@ -136,9 +136,9 @@ Mu::mu_cmd_server(const Mu::Options& opts) try {
 	setup_readline(histpath, 50);
 
 	install_sig_handler();
-	std::cout << ";; Welcome to the " << PACKAGE_STRING << " command-server"
-		  << (opts.debug ? " (debug-mode)" : "") << '\n'
-		  << ";; Use (help) to get a list of commands, (quit) to quit.\n";
+	mu_println(";; Welcome to the " PACKAGE_STRING " command-server{}\n"
+		   ";; Use (help) to get a list of commands, (quit) to quit.",
+		   opts.debug ? " (debug-mode)" : "");
 
 	bool do_quit{};
 	while (!MuTerminate && !do_quit) {

mu/mu-options.cc

@@ -661,7 +661,7 @@ static Result<Options>
 cmd_help(const CLI::App& app, Options& opts)
 {
 	if (opts.help.command.empty()) {
-		std::cout << app.help() << "\n";
+		mu_println("{}", app.help());
 		return Ok(std::move(opts));
 	}
 
@@ -718,12 +718,12 @@ License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.
 )");
-	 app.set_version_flag("-V,--version", PACKAGE_VERSION);
-	 app.set_help_flag("-h,--help", "Show help informmation");
-	 app.set_help_all_flag("--help-all");
-	 app.require_subcommand(0, 1);
+	app.set_version_flag("-V,--version", PACKAGE_VERSION);
+	app.set_help_flag("-h,--help", "Show help informmation");
+	app.set_help_all_flag("--help-all");
+	app.require_subcommand(0, 1);
 
-	 add_global_options(app, opts);
+	add_global_options(app, opts);
 
 	/*
 	 * subcommands
@@ -731,7 +731,7 @@ There is NO WARRANTY, to the extent permitted by law.
 	 * we keep around a map of the subcommand pointers, so we can
 	 * easily find the chosen one (if any) later.
 	 */
-	 for (auto&& cmdinfo: SubCommandInfos) {
+	for (auto&& cmdinfo: SubCommandInfos) {
 		//const auto cmdtype = cmdinfo.first;
 		const auto name{std::string{cmdinfo.second.name}};
 		const auto help{std::string{cmdinfo.second.help}};
@@ -756,12 +756,12 @@ There is NO WARRANTY, to the extent permitted by law.
 					opts.muhome, "Specify alternative mu directory")
 				->envname("MUHOME")
 				->type_name("<dir>");
-	 }
+	}
 
-	 /* add scripts (if supported) as semi-subscommands as well */
-	 const auto scripts = add_scripts(app, opts);
+	/* add scripts (if supported) as semi-subscommands as well */
+	const auto scripts = add_scripts(app, opts);
 
-	 try {
+	try {
 		app.parse(argc, argv);
 
 		// find the chosen sub command,  if any.
@@ -789,11 +789,11 @@ There is NO WARRANTY, to the extent permitted by law.
 			return cmd_help(app, opts);
 
 	} catch (const CLI::CallForHelp& cfh) {
-		std::cout << app.help() << std::flush;
+		mu_println("{}", app.help());
 	} catch (const CLI::CallForAllHelp& cfah) {
-		std::cout << app.help("", CLI::AppFormatMode::All) << std::flush;
+		mu_println("{}", app.help("", CLI::AppFormatMode::All));
 	} catch (const CLI::CallForVersion&) {
-		std::cout << "version " << PACKAGE_VERSION << "\n";
+		mu_println("version {}", PACKAGE_VERSION);
 	} catch (const CLI::ParseError& pe) {
 		return Err(Error::Code::InvalidArgument, "{}", pe.what());
 	}  catch (...) {