mu4e/mu/mu-config.cc

/*
** Copyright (C) 2008-2022 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/

#include "config.h"

#include <glib.h>
#include <string.h> /* memset */
#include <unistd.h>
#include <stdio.h>

#include "mu-config.hh"
#include "mu-cmd.hh"

using namespace Mu;

static MuConfig MU_CONFIG;

#define color_maybe(C) (MU_CONFIG.nocolor ? "" : (C))

static MuConfigFormat
get_output_format(const char* formatstr)
{
	int i;
	struct {
		const char*    name;
		MuConfigFormat format;
	} formats[] = {{"mutt-alias", MU_CONFIG_FORMAT_MUTT_ALIAS},
		       {"mutt-ab", MU_CONFIG_FORMAT_MUTT_AB},
		       {"wl", MU_CONFIG_FORMAT_WL},
		       {"csv", MU_CONFIG_FORMAT_CSV},
		       {"org-contact", MU_CONFIG_FORMAT_ORG_CONTACT},
		       {"bbdb", MU_CONFIG_FORMAT_BBDB},
		       {"links", MU_CONFIG_FORMAT_LINKS},
		       {"plain", MU_CONFIG_FORMAT_PLAIN},
		       {"sexp", MU_CONFIG_FORMAT_SEXP},
		       {"json", MU_CONFIG_FORMAT_JSON},
		       {"xml", MU_CONFIG_FORMAT_XML},
		       {"xquery", MU_CONFIG_FORMAT_XQUERY},
		       {"mquery", MU_CONFIG_FORMAT_MQUERY},
		       {"debug", MU_CONFIG_FORMAT_DEBUG}};

	for (i = 0; i != G_N_ELEMENTS(formats); i++)
		if (strcmp(formats[i].name, formatstr) == 0)
			return formats[i].format;

	return MU_CONFIG_FORMAT_UNKNOWN;
}

#define expand_dir(D)                                                                    \
	if ((D)) {                                                                       \
		char* exp;                                                               \
		exp = mu_util_dir_expand((D));                                           \
		if (exp) {                                                               \
			g_free((D));                                                     \
			(D) = exp;                                                       \
		}                                                                        \
	}

static void
set_group_mu_defaults()
{
	/* If muhome is not set, we use the XDG Base Directory Specification
	 * locations. */
	if (MU_CONFIG.muhome)
		expand_dir(MU_CONFIG.muhome);

	/* check for the MU_NOCOLOR or NO_COLOR env vars; but in any case don't
	 * use colors unless we're writing to a tty */
	if (g_getenv(MU_NOCOLOR) != NULL || g_getenv("NO_COLOR") != NULL)
		MU_CONFIG.nocolor = TRUE;

	if (!isatty(fileno(stdout)) || !isatty(fileno(stderr)))
		MU_CONFIG.nocolor = TRUE;
}

static GOptionGroup*
config_options_group_mu()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    {"debug", 'd', 0, G_OPTION_ARG_NONE, &MU_CONFIG.debug,
	     "print debug output to standard error (false)", NULL},
	    {"quiet", 'q', 0, G_OPTION_ARG_NONE, &MU_CONFIG.quiet,
	     "don't give any progress information (false)", NULL},
	    {"version", 'V', 0, G_OPTION_ARG_NONE, &MU_CONFIG.version,
	     "display version and copyright information (false)", NULL},
	    {"muhome", 0, 0, G_OPTION_ARG_FILENAME, &MU_CONFIG.muhome,
	     "specify an alternative mu directory", "<dir>"},
	    {"log-stderr", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.log_stderr,
	     "log to standard error (false)", NULL},
	    {"nocolor", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.nocolor,
	     "don't use ANSI-colors in output (false)", NULL},
	    {"verbose", 'v', 0, G_OPTION_ARG_NONE, &MU_CONFIG.verbose,
	     "verbose output (false)", NULL},

	    {G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &MU_CONFIG.params,
	     "parameters", NULL},
	    {NULL, 0, 0, (GOptionArg)0, NULL, NULL, NULL}};

	og = g_option_group_new("mu", "general mu options", "", NULL, NULL);
	g_option_group_add_entries(og, entries);

	return og;
}

static void
set_group_init_defaults()
{
	if (!MU_CONFIG.maildir)
		MU_CONFIG.maildir = mu_util_guess_maildir();

	expand_dir(MU_CONFIG.maildir);
}

static GOptionGroup*
config_options_group_init()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    {"maildir", 'm', 0, G_OPTION_ARG_FILENAME, &MU_CONFIG.maildir,
	     "top of the maildir", "<maildir>"},
	    {"my-address", 0, 0, G_OPTION_ARG_STRING_ARRAY, &MU_CONFIG.my_addresses,
	     "my e-mail address; can be used multiple times", "<address>"},
	    {"max-message-size", 0, 0, G_OPTION_ARG_INT, &MU_CONFIG.max_msg_size,
	     "Maximum allowed size for messages", "<size-in-bytes>"},
	    {"batch-size", 0, 0, G_OPTION_ARG_INT, &MU_CONFIG.batch_size,
	     "Number of changes in a database transaction batch", "<number>"},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	og = g_option_group_new("init", "Options for the 'init' command", "", NULL, NULL);
	g_option_group_add_entries(og, entries);

	return og;
}

static gboolean
index_post_parse_func(GOptionContext* context, GOptionGroup* group, gpointer data,
		      GError** error)
{
	if (!MU_CONFIG.maildir && !MU_CONFIG.my_addresses)
		return TRUE;

	g_printerr("%sNOTE%s: as of mu 1.3.8, 'mu index' no longer uses the\n"
		   "--maildir/-m or --my-address options.\n\n",
		   color_maybe(MU_COLOR_RED), color_maybe(MU_COLOR_DEFAULT));
	g_printerr("Instead, these options should be passed to 'mu init'.\n");
	g_printerr(
	    "See the mu-init(1) or the mu4e reference manual,\n'Initializing the message "
	    "store' for details.\n\n");

	return TRUE;
}

static GOptionGroup*
config_options_group_index()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    /* only here so we can tell users they are deprecated */
	    {"maildir", 'm', G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_FILENAME,
	     &MU_CONFIG.maildir, "top of the maildir", "<maildir>"},
	    {"my-address", 0, G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_STRING_ARRAY,
	     &MU_CONFIG.my_addresses, "my e-mail address; can be used multiple times",
	     "<address>"},

	    {"lazy-check", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.lazycheck,
	     "only check dir-timestamps (false)", NULL},
	    {"nocleanup", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.nocleanup,
	     "don't clean up the database after indexing (false)", NULL},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	og = g_option_group_new("index", "Options for the 'index' command", "", NULL,
				NULL);
	g_option_group_add_entries(og, entries);
	g_option_group_set_parse_hooks(og, NULL, (GOptionParseFunc)index_post_parse_func);

	return og;
}

static void
set_group_find_defaults()
{
	/* note, when no fields are specified, we use date-from-subject */
	if (!MU_CONFIG.fields || !*MU_CONFIG.fields) {
		MU_CONFIG.fields = g_strdup("d f s");
		if (!MU_CONFIG.sortfield) {
			MU_CONFIG.sortfield = g_strdup("d");
		}
	}

	if (!MU_CONFIG.formatstr) /* by default, use plain output */
		MU_CONFIG.format = MU_CONFIG_FORMAT_PLAIN;
	else
		MU_CONFIG.format = get_output_format(MU_CONFIG.formatstr);

	expand_dir(MU_CONFIG.linksdir);
}

static GOptionGroup*
config_options_group_find()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    {"fields", 'f', 0, G_OPTION_ARG_STRING, &MU_CONFIG.fields,
	     "fields to display in the output", "<fields>"},
	    {"sortfield", 's', 0, G_OPTION_ARG_STRING, &MU_CONFIG.sortfield,
	     "field to sort on", "<field>"},
	    {"maxnum", 'n', 0, G_OPTION_ARG_INT, &MU_CONFIG.maxnum,
	     "number of entries to display in the output", "<number>"},
	    {"threads", 't', 0, G_OPTION_ARG_NONE, &MU_CONFIG.threads,
	     "show message threads", NULL},
	    {"bookmark", 'b', 0, G_OPTION_ARG_STRING, &MU_CONFIG.bookmark,
	     "use a bookmarked query", "<bookmark>"},
	    {"reverse", 'z', 0, G_OPTION_ARG_NONE, &MU_CONFIG.reverse,
	     "sort in reverse (descending) order (z -> a)", NULL},
	    {"skip-dups", 'u', 0, G_OPTION_ARG_NONE, &MU_CONFIG.skip_dups,
	     "show only the first of messages duplicates (false)", NULL},
	    {"include-related", 'r', 0, G_OPTION_ARG_NONE, &MU_CONFIG.include_related,
	     "include related messages in results (false)", NULL},
	    {"linksdir", 0, 0, G_OPTION_ARG_STRING, &MU_CONFIG.linksdir,
	     "output as symbolic links to a target maildir", "<dir>"},
	    {"clearlinks", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.clearlinks,
	     "clear old links before filling a linksdir (false)", NULL},
	    {"format", 'o', 0, G_OPTION_ARG_STRING, &MU_CONFIG.formatstr,
	     "output format ('plain'(*), 'links', 'xml',"
	      "'sexp', 'xquery')",
	     "<format>"},
	    {"summary-len", 0, 0, G_OPTION_ARG_INT, &MU_CONFIG.summary_len,
	     "use up to <n> lines for the summary, or 0 for none (0)", "<len>"},
	    {"exec", 'e', 0, G_OPTION_ARG_STRING, &MU_CONFIG.exec,
	     "execute command on each match message", "<command>"},
	    {"after", 0, 0, G_OPTION_ARG_INT, &MU_CONFIG.after,
	     "only show messages whose m_time > T (t_time)", "<timestamp>"},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	og = g_option_group_new("find", "Options for the 'find' command", "", NULL, NULL);
	g_option_group_add_entries(og, entries);

	return og;
}

static GOptionGroup*
config_options_group_mkdir()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {{"mode", 0, 0, G_OPTION_ARG_INT, &MU_CONFIG.dirmode,
				   "set the mode (as in chmod), in octal notation",
				   "<mode>"},
				  {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	/* set dirmode before, because '0000' is a valid mode */
	MU_CONFIG.dirmode = 0755;

	og = g_option_group_new("mkdir", "Options for the 'mkdir' command", "", NULL,
				NULL);
	g_option_group_add_entries(og, entries);

	return og;
}

static void
set_group_cfind_defaults()
{
	if (!MU_CONFIG.formatstr) /* by default, use plain output */
		MU_CONFIG.format = MU_CONFIG_FORMAT_PLAIN;
	else
		MU_CONFIG.format = get_output_format(MU_CONFIG.formatstr);
}

static GOptionGroup*
config_options_group_cfind()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    {"format", 'o', 0, G_OPTION_ARG_STRING, &MU_CONFIG.formatstr,
	     "output format (plain(*), mutt-alias, mutt-ab, wl, "
	      "org-contact, bbdb, csv)",
	     "<format>"},
	    {"personal", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.personal,
	     "whether to only get 'personal' contacts", NULL},
	    {"after", 0, 0, G_OPTION_ARG_INT, &MU_CONFIG.after,
	     "only get addresses last seen after T", "<timestamp>"},
	    {"maxnum", 'n', 0, G_OPTION_ARG_INT, &MU_CONFIG.maxnum,
	     "maximum number of contacts", "<number>"},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	og = g_option_group_new("cfind", "Options for the 'cfind' command", "", NULL,
				NULL);
	g_option_group_add_entries(og, entries);

	return og;
}

static GOptionGroup*
config_options_group_script()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {{G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY,
				   &MU_CONFIG.params, "script parameters", NULL},
				  {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	og = g_option_group_new("script", "Options for the 'script' command", "", NULL,
				NULL);

	g_option_group_add_entries(og, entries);

	return og;
}

static void
set_group_view_defaults()
{
	if (!MU_CONFIG.formatstr) /* by default, use plain output */
		MU_CONFIG.format = MU_CONFIG_FORMAT_PLAIN;
	else
		MU_CONFIG.format = get_output_format(MU_CONFIG.formatstr);
}

/* crypto options are used in a few different commands */
static GOptionEntry*
crypto_option_entries()
{
	static GOptionEntry entries[] = {
	    {"auto-retrieve", 'r', 0, G_OPTION_ARG_NONE, &MU_CONFIG.auto_retrieve,
	     "attempt to retrieve keys online (false)", NULL},
	    {"decrypt", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.decrypt,
	     "attempt to decrypt the message", NULL},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	return entries;
}

static GOptionGroup*
config_options_group_view()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    {"summary-len", 0, 0, G_OPTION_ARG_INT, &MU_CONFIG.summary_len,
	     "use up to <n> lines for the summary, or 0 for none (0)", "<len>"},
	    {"terminate", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.terminator,
	     "terminate messages with ascii-0x07 (\\f, form-feed)", NULL},
	    {"format", 'o', 0, G_OPTION_ARG_STRING, &MU_CONFIG.formatstr,
	     "output format ('plain'(*), 'sexp')", "<format>"},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	og = g_option_group_new("view", "Options for the 'view' command", "", NULL, NULL);

	g_option_group_add_entries(og, entries);
	g_option_group_add_entries(og, crypto_option_entries());

	return og;
}

static void
set_group_extract_defaults()
{
	if (!MU_CONFIG.targetdir)
		MU_CONFIG.targetdir = g_strdup(".");

	expand_dir(MU_CONFIG.targetdir);
}

static GOptionGroup*
config_options_group_extract()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    {"save-attachments", 'a', 0, G_OPTION_ARG_NONE, &MU_CONFIG.save_attachments,
	     "save all attachments (false)", NULL},
	    {"save-all", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.save_all,
	     "save all parts (incl. non-attachments) (false)", NULL},
	    {"parts", 0, 0, G_OPTION_ARG_STRING, &MU_CONFIG.parts,
	     "save specific parts (comma-separated list)", "<parts>"},
	    {"target-dir", 0, 0, G_OPTION_ARG_FILENAME, &MU_CONFIG.targetdir,
	     "target directory for saving", "<dir>"},
	    {"overwrite", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.overwrite,
	     "overwrite existing files (false)", NULL},
	    {"play", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.play,
	     "try to 'play' (open) the extracted parts", NULL},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};
	og = g_option_group_new("extract", "Options for the 'extract' command", "", NULL,
				NULL);
	g_option_group_add_entries(og, entries);
	g_option_group_add_entries(og, crypto_option_entries());

	return og;
}

static GOptionGroup*
config_options_group_verify()
{
	GOptionGroup* og;
	og = g_option_group_new("verify", "Options for the 'verify' command", "", NULL,
				NULL);
	g_option_group_add_entries(og, crypto_option_entries());

	return og;
}

static GOptionGroup*
config_options_group_server()
{
	GOptionGroup* og;
	GOptionEntry  entries[] = {
	    {"commands", 0, 0, G_OPTION_ARG_NONE, &MU_CONFIG.commands,
	     "list the available command and their parameters, then exit", NULL},
	    {"eval", 'e', G_OPTION_FLAG_HIDDEN, G_OPTION_ARG_STRING, &MU_CONFIG.eval,
	     "expression to evaluate", "<expr>"},
	    {NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}};

	og = g_option_group_new("server", "Options for the 'server' command", "", NULL,
				NULL);
	g_option_group_add_entries(og, entries);

	return og;
}

static MuConfigCmd
cmd_from_string(const char* str)
{
	int i;
	struct {
		const gchar* name;
		MuConfigCmd  cmd;
	} cmd_map[] = {
	    {"add", MU_CONFIG_CMD_ADD},         {"cfind", MU_CONFIG_CMD_CFIND},
	    {"extract", MU_CONFIG_CMD_EXTRACT}, {"find", MU_CONFIG_CMD_FIND},
	    {"help", MU_CONFIG_CMD_HELP},       {"index", MU_CONFIG_CMD_INDEX},
	    {"info", MU_CONFIG_CMD_INFO},       {"init", MU_CONFIG_CMD_INIT},
	    {"mkdir", MU_CONFIG_CMD_MKDIR},     {"remove", MU_CONFIG_CMD_REMOVE},
	    {"script", MU_CONFIG_CMD_SCRIPT},   {"server", MU_CONFIG_CMD_SERVER},
	    {"verify", MU_CONFIG_CMD_VERIFY},   {"view", MU_CONFIG_CMD_VIEW},
	    {"fields", MU_CONFIG_CMD_FIELDS},
	};

	if (!str)
		return MU_CONFIG_CMD_UNKNOWN;

	for (i = 0; i != G_N_ELEMENTS(cmd_map); ++i)
		if (strcmp(str, cmd_map[i].name) == 0)
			return cmd_map[i].cmd;
#ifdef BUILD_GUILE
	/* if we don't recognize it and it's not an option, it may be
	 * some script */
	if (str[0] != '-')
		return MU_CONFIG_CMD_SCRIPT;
#endif /*BUILD_GUILE*/

	return MU_CONFIG_CMD_UNKNOWN;
}

static gboolean
parse_cmd(int* argcp, char*** argvp, GError** err)
{
	MU_CONFIG.cmd    = MU_CONFIG_CMD_NONE;
	MU_CONFIG.cmdstr = NULL;

	if (*argcp < 2) /* no command found at all */
		return TRUE;
	else if ((**argvp)[1] == '-')
		/* if the first param starts with '-', there is no
		 * command, just some option (like --version, --help
		 * etc.)*/
		return TRUE;

	MU_CONFIG.cmdstr = g_strdup((*argvp)[1]);
	MU_CONFIG.cmd    = cmd_from_string(MU_CONFIG.cmdstr);

#ifndef BUILD_GUILE
	if (MU_CONFIG.cmd == MU_CONFIG_CMD_SCRIPT) {
		mu_util_g_set_error(err, MU_ERROR_IN_PARAMETERS,
				    "command 'script' not supported");
		return FALSE;
	}
#endif /*!BUILD_GUILE*/

	if (MU_CONFIG.cmdstr && MU_CONFIG.cmdstr[0] != '-' &&
	    MU_CONFIG.cmd == MU_CONFIG_CMD_UNKNOWN) {
		mu_util_g_set_error(err, MU_ERROR_IN_PARAMETERS, "unknown command '%s'",
				    MU_CONFIG.cmdstr);
		return FALSE;
	}

	return TRUE;
}

static GOptionGroup*
get_option_group(MuConfigCmd cmd)
{
	switch (cmd) {
	case MU_CONFIG_CMD_CFIND: return config_options_group_cfind();
	case MU_CONFIG_CMD_EXTRACT: return config_options_group_extract();
	case MU_CONFIG_CMD_FIND: return config_options_group_find();
	case MU_CONFIG_CMD_INDEX: return config_options_group_index();
	case MU_CONFIG_CMD_INIT: return config_options_group_init();
	case MU_CONFIG_CMD_MKDIR: return config_options_group_mkdir();
	case MU_CONFIG_CMD_SERVER: return config_options_group_server();
	case MU_CONFIG_CMD_SCRIPT: return config_options_group_script();
	case MU_CONFIG_CMD_VERIFY: return config_options_group_verify();
	case MU_CONFIG_CMD_VIEW: return config_options_group_view();
	default: return NULL; /* no group to add */
	}
}

/* ugh yuck massaging the GOption text output; glib prepares some text
 * which has a 'Usage:' for the 'help' command. However, we need the
 * help for the command we're asking help for. So, we remove the Usage:
 * from what glib generates. :-( */
static gchar*
massage_help(const char* help)
{
	GRegex* rx;
	char*   str;

	rx  = g_regex_new("^Usage:.*\n.*\n", (GRegexCompileFlags)0,
			  G_REGEX_MATCH_NEWLINE_ANY, NULL);
	str = g_regex_replace(rx, help, -1, 0, "", G_REGEX_MATCH_NEWLINE_ANY, NULL);
	g_regex_unref(rx);
	return str;
}

static const char*
get_help_string(MuConfigCmd cmd, bool long_help)
{
	struct Help {
		MuConfigCmd cmd;
		const char* usage;
		const char* long_help;
	};
	constexpr std::array all_help = {
#include "mu-help-strings.inc"
	};

	const auto help_it = std::find_if(all_help.begin(), all_help.end(),
					  [&](auto&& info) { return info.cmd == cmd; });
	if (help_it == all_help.end()) {
		g_critical("cannot find info for %u", cmd);
		return "";
	} else
		return long_help ? help_it->long_help : help_it->usage;
}

void
Mu::mu_config_show_help(MuConfigCmd cmd)
{
	GOptionContext* ctx;
	GOptionGroup*   group;
	char *          help, *cleanhelp;

	g_return_if_fail(mu_config_cmd_is_valid(cmd));

	ctx = g_option_context_new("- mu help");
	g_option_context_set_main_group(ctx, config_options_group_mu());

	group = get_option_group(cmd);
	if (group)
		g_option_context_add_group(ctx, group);

	g_option_context_set_description(ctx, get_help_string(cmd, TRUE));
	help      = g_option_context_get_help(ctx, TRUE, group);
	cleanhelp = massage_help(help);

	g_print("usage:\n\t%s%s", get_help_string(cmd, FALSE), cleanhelp);

	g_free(help);
	g_free(cleanhelp);
	g_option_context_free(ctx);
}

static gboolean
cmd_help()
{
	MuConfigCmd cmd;

	if (!MU_CONFIG.params)
		cmd = MU_CONFIG_CMD_UNKNOWN;
	else
		cmd = cmd_from_string(MU_CONFIG.params[1]);

	if (cmd == MU_CONFIG_CMD_UNKNOWN) {
		mu_config_show_help(MU_CONFIG_CMD_HELP);
		return TRUE;
	}

	mu_config_show_help(cmd);

	return TRUE;
}

static gboolean
parse_params(int* argcp, char*** argvp, GError** err)
{
	GOptionContext* context;
	GOptionGroup*   group;
	gboolean        rv;

	context = g_option_context_new("- mu general options");

	g_option_context_set_help_enabled(context, TRUE);
	g_option_context_set_main_group(context, config_options_group_mu());
	g_option_context_set_ignore_unknown_options(context, FALSE);

	switch (MU_CONFIG.cmd) {
	case MU_CONFIG_CMD_NONE:
	case MU_CONFIG_CMD_HELP:
		/* 'help' is special; sucks in the options of the
		 * command after it */
		rv = g_option_context_parse(context, argcp, argvp, err) && cmd_help();
		break;
	case MU_CONFIG_CMD_SCRIPT:
		/* all unknown commands are passed to 'script' */
		g_option_context_set_ignore_unknown_options(context, TRUE);
		group = get_option_group(MU_CONFIG.cmd);
		g_option_context_add_group(context, group);
		rv               = g_option_context_parse(context, argcp, argvp, err);
		MU_CONFIG.script = g_strdup(MU_CONFIG.cmdstr);
		/* argvp contains the script parameters */
		MU_CONFIG.script_params = (const char**)&((*argvp)[1]);
		break;

	default:
		group = get_option_group(MU_CONFIG.cmd);
		if (group)
			g_option_context_add_group(context, group);

		rv = g_option_context_parse(context, argcp, argvp, err);
		break;
	}

	g_option_context_free(context);

	return rv ? TRUE : FALSE;
}

MuConfig*
Mu::mu_config_init(int* argcp, char*** argvp, GError** err)
{
	g_return_val_if_fail(argcp && argvp, NULL);

	memset(&MU_CONFIG, 0, sizeof(MU_CONFIG));

	if (!parse_cmd(argcp, argvp, err))
		goto errexit;

	if (!parse_params(argcp, argvp, err))
		goto errexit;

	/* fill in the defaults if user did not specify */
	set_group_mu_defaults();
	set_group_init_defaults();
	set_group_find_defaults();
	set_group_cfind_defaults();
	set_group_view_defaults();
	set_group_extract_defaults();
	/* set_group_mkdir_defaults (config); */

	return &MU_CONFIG;

errexit:
	mu_config_uninit(&MU_CONFIG);
	return NULL;
}

void
Mu::mu_config_uninit(MuConfig* opts)
{
	if (!opts)
		return;

	g_free(opts->cmdstr);
	g_free(opts->muhome);
	g_free(opts->maildir);
	g_free(opts->fields);
	g_free(opts->sortfield);
	g_free(opts->bookmark);
	g_free(opts->formatstr);
	g_free(opts->exec);
	g_free(opts->linksdir);
	g_free(opts->targetdir);
	g_free(opts->parts);
	g_free(opts->script);
	g_free(opts->eval);

	g_strfreev(opts->my_addresses);
	g_strfreev(opts->params);

	memset(opts, 0, sizeof(MU_CONFIG));
}

size_t
Mu::mu_config_param_num(const MuConfig* opts)
{
	size_t n;

	g_return_val_if_fail(opts && opts->params, 0);
	for (n = 0; opts->params[n]; ++n)
		;

	return n;
}

Message::Options
Mu::mu_config_message_options(const MuConfig *conf)
{
	Message::Options opts{};

	if (conf->decrypt)
		opts |= Message::Options::Decrypt;
	if (conf->auto_retrieve)
		opts |= Message::Options::RetrieveKeys;

	return opts;
}