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-rw-r--r--builtin/help.c722
1 files changed, 722 insertions, 0 deletions
diff --git a/builtin/help.c b/builtin/help.c
new file mode 100644
index 0000000..53f2812
--- /dev/null
+++ b/builtin/help.c
@@ -0,0 +1,722 @@
+/*
+ * Builtin help command
+ */
+#include "cache.h"
+#include "config.h"
+#include "builtin.h"
+#include "exec-cmd.h"
+#include "parse-options.h"
+#include "run-command.h"
+#include "config-list.h"
+#include "help.h"
+#include "alias.h"
+
+#ifndef DEFAULT_HELP_FORMAT
+#define DEFAULT_HELP_FORMAT "man"
+#endif
+
+static struct man_viewer_list {
+ struct man_viewer_list *next;
+ char name[FLEX_ARRAY];
+} *man_viewer_list;
+
+static struct man_viewer_info_list {
+ struct man_viewer_info_list *next;
+ const char *info;
+ char name[FLEX_ARRAY];
+} *man_viewer_info_list;
+
+enum help_format {
+ HELP_FORMAT_NONE,
+ HELP_FORMAT_MAN,
+ HELP_FORMAT_INFO,
+ HELP_FORMAT_WEB
+};
+
+enum show_config_type {
+ SHOW_CONFIG_HUMAN,
+ SHOW_CONFIG_VARS,
+ SHOW_CONFIG_SECTIONS,
+};
+
+static enum help_action {
+ HELP_ACTION_ALL = 1,
+ HELP_ACTION_GUIDES,
+ HELP_ACTION_CONFIG,
+ HELP_ACTION_USER_INTERFACES,
+ HELP_ACTION_DEVELOPER_INTERFACES,
+ HELP_ACTION_CONFIG_FOR_COMPLETION,
+ HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION,
+} cmd_mode;
+
+static const char *html_path;
+static int verbose = 1;
+static enum help_format help_format = HELP_FORMAT_NONE;
+static int exclude_guides;
+static int show_external_commands = -1;
+static int show_aliases = -1;
+static struct option builtin_help_options[] = {
+ OPT_CMDMODE('a', "all", &cmd_mode, N_("print all available commands"),
+ HELP_ACTION_ALL),
+ OPT_BOOL(0, "external-commands", &show_external_commands,
+ N_("show external commands in --all")),
+ OPT_BOOL(0, "aliases", &show_aliases, N_("show aliases in --all")),
+ OPT_HIDDEN_BOOL(0, "exclude-guides", &exclude_guides, N_("exclude guides")),
+ OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN),
+ OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"),
+ HELP_FORMAT_WEB),
+ OPT_SET_INT('i', "info", &help_format, N_("show info page"),
+ HELP_FORMAT_INFO),
+ OPT__VERBOSE(&verbose, N_("print command description")),
+
+ OPT_CMDMODE('g', "guides", &cmd_mode, N_("print list of useful guides"),
+ HELP_ACTION_GUIDES),
+ OPT_CMDMODE(0, "user-interfaces", &cmd_mode,
+ N_("print list of user-facing repository, command and file interfaces"),
+ HELP_ACTION_USER_INTERFACES),
+ OPT_CMDMODE(0, "developer-interfaces", &cmd_mode,
+ N_("print list of file formats, protocols and other developer interfaces"),
+ HELP_ACTION_DEVELOPER_INTERFACES),
+ OPT_CMDMODE('c', "config", &cmd_mode, N_("print all configuration variable names"),
+ HELP_ACTION_CONFIG),
+ OPT_CMDMODE_F(0, "config-for-completion", &cmd_mode, "",
+ HELP_ACTION_CONFIG_FOR_COMPLETION, PARSE_OPT_HIDDEN),
+ OPT_CMDMODE_F(0, "config-sections-for-completion", &cmd_mode, "",
+ HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION, PARSE_OPT_HIDDEN),
+
+ OPT_END(),
+};
+
+static const char * const builtin_help_usage[] = {
+ "git help [-a|--all] [--[no-]verbose] [--[no-]external-commands] [--[no-]aliases]",
+ N_("git help [[-i|--info] [-m|--man] [-w|--web]] [<command>|<doc>]"),
+ "git help [-g|--guides]",
+ "git help [-c|--config]",
+ "git help [--user-interfaces]",
+ "git help [--developer-interfaces]",
+ NULL
+};
+
+struct slot_expansion {
+ const char *prefix;
+ const char *placeholder;
+ void (*fn)(struct string_list *list, const char *prefix);
+ int found;
+};
+
+static void list_config_help(enum show_config_type type)
+{
+ struct slot_expansion slot_expansions[] = {
+ { "advice", "*", list_config_advices },
+ { "color.branch", "<slot>", list_config_color_branch_slots },
+ { "color.decorate", "<slot>", list_config_color_decorate_slots },
+ { "color.diff", "<slot>", list_config_color_diff_slots },
+ { "color.grep", "<slot>", list_config_color_grep_slots },
+ { "color.interactive", "<slot>", list_config_color_interactive_slots },
+ { "color.remote", "<slot>", list_config_color_sideband_slots },
+ { "color.status", "<slot>", list_config_color_status_slots },
+ { "fsck", "<msg-id>", list_config_fsck_msg_ids },
+ { "receive.fsck", "<msg-id>", list_config_fsck_msg_ids },
+ { NULL, NULL, NULL }
+ };
+ const char **p;
+ struct slot_expansion *e;
+ struct string_list keys = STRING_LIST_INIT_DUP;
+ struct string_list keys_uniq = STRING_LIST_INIT_DUP;
+ struct string_list_item *item;
+ int i;
+
+ for (p = config_name_list; *p; p++) {
+ const char *var = *p;
+ struct strbuf sb = STRBUF_INIT;
+
+ for (e = slot_expansions; e->prefix; e++) {
+
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%s.%s", e->prefix, e->placeholder);
+ if (!strcasecmp(var, sb.buf)) {
+ e->fn(&keys, e->prefix);
+ e->found++;
+ break;
+ }
+ }
+ strbuf_release(&sb);
+ if (!e->prefix)
+ string_list_append(&keys, var);
+ }
+
+ for (e = slot_expansions; e->prefix; e++)
+ if (!e->found)
+ BUG("slot_expansion %s.%s is not used",
+ e->prefix, e->placeholder);
+
+ string_list_sort(&keys);
+ for (i = 0; i < keys.nr; i++) {
+ const char *var = keys.items[i].string;
+ const char *wildcard, *tag, *cut;
+ const char *dot = NULL;
+ struct strbuf sb = STRBUF_INIT;
+
+ switch (type) {
+ case SHOW_CONFIG_HUMAN:
+ puts(var);
+ continue;
+ case SHOW_CONFIG_SECTIONS:
+ dot = strchr(var, '.');
+ break;
+ case SHOW_CONFIG_VARS:
+ break;
+ }
+ wildcard = strchr(var, '*');
+ tag = strchr(var, '<');
+
+ if (!dot && !wildcard && !tag) {
+ string_list_append(&keys_uniq, var);
+ continue;
+ }
+
+ if (dot)
+ cut = dot;
+ else if (wildcard && !tag)
+ cut = wildcard;
+ else if (!wildcard && tag)
+ cut = tag;
+ else
+ cut = wildcard < tag ? wildcard : tag;
+
+ strbuf_add(&sb, var, cut - var);
+ string_list_append(&keys_uniq, sb.buf);
+ strbuf_release(&sb);
+
+ }
+ string_list_clear(&keys, 0);
+ string_list_remove_duplicates(&keys_uniq, 0);
+ for_each_string_list_item(item, &keys_uniq)
+ puts(item->string);
+ string_list_clear(&keys_uniq, 0);
+}
+
+static enum help_format parse_help_format(const char *format)
+{
+ if (!strcmp(format, "man"))
+ return HELP_FORMAT_MAN;
+ if (!strcmp(format, "info"))
+ return HELP_FORMAT_INFO;
+ if (!strcmp(format, "web") || !strcmp(format, "html"))
+ return HELP_FORMAT_WEB;
+ /*
+ * Please update _git_config() in git-completion.bash when you
+ * add new help formats.
+ */
+ die(_("unrecognized help format '%s'"), format);
+}
+
+static const char *get_man_viewer_info(const char *name)
+{
+ struct man_viewer_info_list *viewer;
+
+ for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
+ {
+ if (!strcasecmp(name, viewer->name))
+ return viewer->info;
+ }
+ return NULL;
+}
+
+static int check_emacsclient_version(void)
+{
+ struct strbuf buffer = STRBUF_INIT;
+ struct child_process ec_process = CHILD_PROCESS_INIT;
+ int version;
+
+ /* emacsclient prints its version number on stderr */
+ strvec_pushl(&ec_process.args, "emacsclient", "--version", NULL);
+ ec_process.err = -1;
+ ec_process.stdout_to_stderr = 1;
+ if (start_command(&ec_process))
+ return error(_("Failed to start emacsclient."));
+
+ strbuf_read(&buffer, ec_process.err, 20);
+ close(ec_process.err);
+
+ /*
+ * Don't bother checking return value, because "emacsclient --version"
+ * seems to always exits with code 1.
+ */
+ finish_command(&ec_process);
+
+ if (!starts_with(buffer.buf, "emacsclient")) {
+ strbuf_release(&buffer);
+ return error(_("Failed to parse emacsclient version."));
+ }
+
+ strbuf_remove(&buffer, 0, strlen("emacsclient"));
+ version = atoi(buffer.buf);
+
+ if (version < 22) {
+ strbuf_release(&buffer);
+ return error(_("emacsclient version '%d' too old (< 22)."),
+ version);
+ }
+
+ strbuf_release(&buffer);
+ return 0;
+}
+
+static void exec_woman_emacs(const char *path, const char *page)
+{
+ if (!check_emacsclient_version()) {
+ /* This works only with emacsclient version >= 22. */
+ struct strbuf man_page = STRBUF_INIT;
+
+ if (!path)
+ path = "emacsclient";
+ strbuf_addf(&man_page, "(woman \"%s\")", page);
+ execlp(path, "emacsclient", "-e", man_page.buf, (char *)NULL);
+ warning_errno(_("failed to exec '%s'"), path);
+ strbuf_release(&man_page);
+ }
+}
+
+static void exec_man_konqueror(const char *path, const char *page)
+{
+ const char *display = getenv("DISPLAY");
+ if (display && *display) {
+ struct strbuf man_page = STRBUF_INIT;
+ const char *filename = "kfmclient";
+
+ /* It's simpler to launch konqueror using kfmclient. */
+ if (path) {
+ size_t len;
+ if (strip_suffix(path, "/konqueror", &len))
+ path = xstrfmt("%.*s/kfmclient", (int)len, path);
+ filename = basename((char *)path);
+ } else
+ path = "kfmclient";
+ strbuf_addf(&man_page, "man:%s(1)", page);
+ execlp(path, filename, "newTab", man_page.buf, (char *)NULL);
+ warning_errno(_("failed to exec '%s'"), path);
+ strbuf_release(&man_page);
+ }
+}
+
+static void exec_man_man(const char *path, const char *page)
+{
+ if (!path)
+ path = "man";
+ execlp(path, "man", page, (char *)NULL);
+ warning_errno(_("failed to exec '%s'"), path);
+}
+
+static void exec_man_cmd(const char *cmd, const char *page)
+{
+ struct strbuf shell_cmd = STRBUF_INIT;
+ strbuf_addf(&shell_cmd, "%s %s", cmd, page);
+ execl(SHELL_PATH, SHELL_PATH, "-c", shell_cmd.buf, (char *)NULL);
+ warning(_("failed to exec '%s'"), cmd);
+ strbuf_release(&shell_cmd);
+}
+
+static void add_man_viewer(const char *name)
+{
+ struct man_viewer_list **p = &man_viewer_list;
+
+ while (*p)
+ p = &((*p)->next);
+ FLEX_ALLOC_STR(*p, name, name);
+}
+
+static int supported_man_viewer(const char *name, size_t len)
+{
+ return (!strncasecmp("man", name, len) ||
+ !strncasecmp("woman", name, len) ||
+ !strncasecmp("konqueror", name, len));
+}
+
+static void do_add_man_viewer_info(const char *name,
+ size_t len,
+ const char *value)
+{
+ struct man_viewer_info_list *new_man_viewer;
+ FLEX_ALLOC_MEM(new_man_viewer, name, name, len);
+ new_man_viewer->info = xstrdup(value);
+ new_man_viewer->next = man_viewer_info_list;
+ man_viewer_info_list = new_man_viewer;
+}
+
+static int add_man_viewer_path(const char *name,
+ size_t len,
+ const char *value)
+{
+ if (supported_man_viewer(name, len))
+ do_add_man_viewer_info(name, len, value);
+ else
+ warning(_("'%s': path for unsupported man viewer.\n"
+ "Please consider using 'man.<tool>.cmd' instead."),
+ name);
+
+ return 0;
+}
+
+static int add_man_viewer_cmd(const char *name,
+ size_t len,
+ const char *value)
+{
+ if (supported_man_viewer(name, len))
+ warning(_("'%s': cmd for supported man viewer.\n"
+ "Please consider using 'man.<tool>.path' instead."),
+ name);
+ else
+ do_add_man_viewer_info(name, len, value);
+
+ return 0;
+}
+
+static int add_man_viewer_info(const char *var, const char *value)
+{
+ const char *name, *subkey;
+ size_t namelen;
+
+ if (parse_config_key(var, "man", &name, &namelen, &subkey) < 0 || !name)
+ return 0;
+
+ if (!strcmp(subkey, "path")) {
+ if (!value)
+ return config_error_nonbool(var);
+ return add_man_viewer_path(name, namelen, value);
+ }
+ if (!strcmp(subkey, "cmd")) {
+ if (!value)
+ return config_error_nonbool(var);
+ return add_man_viewer_cmd(name, namelen, value);
+ }
+
+ return 0;
+}
+
+static int git_help_config(const char *var, const char *value, void *cb)
+{
+ if (!strcmp(var, "help.format")) {
+ if (!value)
+ return config_error_nonbool(var);
+ help_format = parse_help_format(value);
+ return 0;
+ }
+ if (!strcmp(var, "help.htmlpath")) {
+ if (!value)
+ return config_error_nonbool(var);
+ html_path = xstrdup(value);
+ return 0;
+ }
+ if (!strcmp(var, "man.viewer")) {
+ if (!value)
+ return config_error_nonbool(var);
+ add_man_viewer(value);
+ return 0;
+ }
+ if (starts_with(var, "man."))
+ return add_man_viewer_info(var, value);
+
+ return git_default_config(var, value, cb);
+}
+
+static struct cmdnames main_cmds, other_cmds;
+
+static int is_git_command(const char *s)
+{
+ if (is_builtin(s))
+ return 1;
+
+ load_command_list("git-", &main_cmds, &other_cmds);
+ return is_in_cmdlist(&main_cmds, s) ||
+ is_in_cmdlist(&other_cmds, s);
+}
+
+static const char *cmd_to_page(const char *git_cmd)
+{
+ if (!git_cmd)
+ return "git";
+ else if (starts_with(git_cmd, "git"))
+ return git_cmd;
+ else if (is_git_command(git_cmd))
+ return xstrfmt("git-%s", git_cmd);
+ else if (!strcmp("scalar", git_cmd))
+ return xstrdup(git_cmd);
+ else
+ return xstrfmt("git%s", git_cmd);
+}
+
+static void setup_man_path(void)
+{
+ struct strbuf new_path = STRBUF_INIT;
+ const char *old_path = getenv("MANPATH");
+ char *git_man_path = system_path(GIT_MAN_PATH);
+
+ /* We should always put ':' after our path. If there is no
+ * old_path, the ':' at the end will let 'man' to try
+ * system-wide paths after ours to find the manual page. If
+ * there is old_path, we need ':' as delimiter. */
+ strbuf_addstr(&new_path, git_man_path);
+ strbuf_addch(&new_path, ':');
+ if (old_path)
+ strbuf_addstr(&new_path, old_path);
+
+ free(git_man_path);
+ setenv("MANPATH", new_path.buf, 1);
+
+ strbuf_release(&new_path);
+}
+
+static void exec_viewer(const char *name, const char *page)
+{
+ const char *info = get_man_viewer_info(name);
+
+ if (!strcasecmp(name, "man"))
+ exec_man_man(info, page);
+ else if (!strcasecmp(name, "woman"))
+ exec_woman_emacs(info, page);
+ else if (!strcasecmp(name, "konqueror"))
+ exec_man_konqueror(info, page);
+ else if (info)
+ exec_man_cmd(info, page);
+ else
+ warning(_("'%s': unknown man viewer."), name);
+}
+
+static void show_man_page(const char *page)
+{
+ struct man_viewer_list *viewer;
+ const char *fallback = getenv("GIT_MAN_VIEWER");
+
+ setup_man_path();
+ for (viewer = man_viewer_list; viewer; viewer = viewer->next)
+ {
+ exec_viewer(viewer->name, page); /* will return when unable */
+ }
+ if (fallback)
+ exec_viewer(fallback, page);
+ exec_viewer("man", page);
+ die(_("no man viewer handled the request"));
+}
+
+static void show_info_page(const char *page)
+{
+ setenv("INFOPATH", system_path(GIT_INFO_PATH), 1);
+ execlp("info", "info", "gitman", page, (char *)NULL);
+ die(_("no info viewer handled the request"));
+}
+
+static void get_html_page_path(struct strbuf *page_path, const char *page)
+{
+ struct stat st;
+ char *to_free = NULL;
+
+ if (!html_path)
+ html_path = to_free = system_path(GIT_HTML_PATH);
+
+ /*
+ * Check that the page we're looking for exists.
+ */
+ if (!strstr(html_path, "://")) {
+ if (stat(mkpath("%s/%s.html", html_path, page), &st)
+ || !S_ISREG(st.st_mode))
+ die("'%s/%s.html': documentation file not found.",
+ html_path, page);
+ }
+
+ strbuf_init(page_path, 0);
+ strbuf_addf(page_path, "%s/%s.html", html_path, page);
+ free(to_free);
+}
+
+static void open_html(const char *path)
+{
+ execl_git_cmd("web--browse", "-c", "help.browser", path, (char *)NULL);
+}
+
+static void show_html_page(const char *page)
+{
+ struct strbuf page_path; /* it leaks but we exec bellow */
+
+ get_html_page_path(&page_path, page);
+
+ open_html(page_path.buf);
+}
+
+static const char *check_git_cmd(const char* cmd)
+{
+ char *alias;
+
+ if (is_git_command(cmd))
+ return cmd;
+
+ alias = alias_lookup(cmd);
+ if (alias) {
+ const char **argv;
+ int count;
+
+ /*
+ * handle_builtin() in git.c rewrites "git cmd --help"
+ * to "git help --exclude-guides cmd", so we can use
+ * exclude_guides to distinguish "git cmd --help" from
+ * "git help cmd". In the latter case, or if cmd is an
+ * alias for a shell command, just print the alias
+ * definition.
+ */
+ if (!exclude_guides || alias[0] == '!') {
+ printf_ln(_("'%s' is aliased to '%s'"), cmd, alias);
+ free(alias);
+ exit(0);
+ }
+ /*
+ * Otherwise, we pretend that the command was "git
+ * word0 --help". We use split_cmdline() to get the
+ * first word of the alias, to ensure that we use the
+ * same rules as when the alias is actually
+ * used. split_cmdline() modifies alias in-place.
+ */
+ fprintf_ln(stderr, _("'%s' is aliased to '%s'"), cmd, alias);
+ count = split_cmdline(alias, &argv);
+ if (count < 0)
+ die(_("bad alias.%s string: %s"), cmd,
+ split_cmdline_strerror(count));
+ free(argv);
+ UNLEAK(alias);
+ return alias;
+ }
+
+ if (exclude_guides)
+ return help_unknown_cmd(cmd);
+
+ return cmd;
+}
+
+static void no_help_format(const char *opt_mode, enum help_format fmt)
+{
+ const char *opt_fmt;
+
+ switch (fmt) {
+ case HELP_FORMAT_NONE:
+ return;
+ case HELP_FORMAT_MAN:
+ opt_fmt = "--man";
+ break;
+ case HELP_FORMAT_INFO:
+ opt_fmt = "--info";
+ break;
+ case HELP_FORMAT_WEB:
+ opt_fmt = "--web";
+ break;
+ default:
+ BUG("unreachable");
+ }
+
+ usage_msg_optf(_("options '%s' and '%s' cannot be used together"),
+ builtin_help_usage, builtin_help_options, opt_mode,
+ opt_fmt);
+}
+
+static void opt_mode_usage(int argc, const char *opt_mode,
+ enum help_format fmt)
+{
+ if (argc)
+ usage_msg_optf(_("the '%s' option doesn't take any non-option arguments"),
+ builtin_help_usage, builtin_help_options,
+ opt_mode);
+
+ no_help_format(opt_mode, fmt);
+}
+
+int cmd_help(int argc, const char **argv, const char *prefix)
+{
+ int nongit;
+ enum help_format parsed_help_format;
+ const char *page;
+
+ argc = parse_options(argc, argv, prefix, builtin_help_options,
+ builtin_help_usage, 0);
+ parsed_help_format = help_format;
+
+ if (cmd_mode != HELP_ACTION_ALL &&
+ (show_external_commands >= 0 ||
+ show_aliases >= 0))
+ usage_msg_opt(_("the '--no-[external-commands|aliases]' options can only be used with '--all'"),
+ builtin_help_usage, builtin_help_options);
+
+ switch (cmd_mode) {
+ case HELP_ACTION_ALL:
+ opt_mode_usage(argc, "--all", help_format);
+ if (verbose) {
+ setup_pager();
+ list_all_cmds_help(show_external_commands,
+ show_aliases);
+ return 0;
+ }
+ printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
+ load_command_list("git-", &main_cmds, &other_cmds);
+ list_commands(&main_cmds, &other_cmds);
+ printf("%s\n", _(git_more_info_string));
+ break;
+ case HELP_ACTION_GUIDES:
+ opt_mode_usage(argc, "--guides", help_format);
+ list_guides_help();
+ printf("%s\n", _(git_more_info_string));
+ return 0;
+ case HELP_ACTION_CONFIG_FOR_COMPLETION:
+ opt_mode_usage(argc, "--config-for-completion", help_format);
+ list_config_help(SHOW_CONFIG_VARS);
+ return 0;
+ case HELP_ACTION_USER_INTERFACES:
+ opt_mode_usage(argc, "--user-interfaces", help_format);
+ list_user_interfaces_help();
+ return 0;
+ case HELP_ACTION_DEVELOPER_INTERFACES:
+ opt_mode_usage(argc, "--developer-interfaces", help_format);
+ list_developer_interfaces_help();
+ return 0;
+ case HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION:
+ opt_mode_usage(argc, "--config-sections-for-completion",
+ help_format);
+ list_config_help(SHOW_CONFIG_SECTIONS);
+ return 0;
+ case HELP_ACTION_CONFIG:
+ opt_mode_usage(argc, "--config", help_format);
+ setup_pager();
+ list_config_help(SHOW_CONFIG_HUMAN);
+ printf("\n%s\n", _("'git help config' for more information"));
+ return 0;
+ }
+
+ if (!argv[0]) {
+ printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
+ list_common_cmds_help();
+ printf("\n%s\n", _(git_more_info_string));
+ return 0;
+ }
+
+ setup_git_directory_gently(&nongit);
+ git_config(git_help_config, NULL);
+
+ if (parsed_help_format != HELP_FORMAT_NONE)
+ help_format = parsed_help_format;
+ if (help_format == HELP_FORMAT_NONE)
+ help_format = parse_help_format(DEFAULT_HELP_FORMAT);
+
+ argv[0] = check_git_cmd(argv[0]);
+
+ page = cmd_to_page(argv[0]);
+ switch (help_format) {
+ case HELP_FORMAT_NONE:
+ case HELP_FORMAT_MAN:
+ show_man_page(page);
+ break;
+ case HELP_FORMAT_INFO:
+ show_info_page(page);
+ break;
+ case HELP_FORMAT_WEB:
+ show_html_page(page);
+ break;
+ }
+
+ return 0;
+}