mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-09 08:00:13 +00:00
c56d61883c
The help string for some commands could be split to more lines for clarity, eg. as is now in the receive command. The 'btrfs help' listing should indent all the lines properly, similar the command specific help with "usage:'. The syntax of the first help string line is to separate all command usage schemas by "\n". Signed-off-by: David Sterba <dsterba@suse.com>
385 lines
8.4 KiB
C
385 lines
8.4 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <getopt.h>
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#include "commands.h"
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#include "utils.h"
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#include "help.h"
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#define USAGE_SHORT 1U
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#define USAGE_LONG 2U
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#define USAGE_OPTIONS 4U
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#define USAGE_LISTING 8U
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static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
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const char *get_argv0_buf(void)
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{
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return argv0_buf;
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}
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void fixup_argv0(char **argv, const char *token)
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{
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int len = strlen(argv0_buf);
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snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
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argv[0] = argv0_buf;
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}
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void set_argv0(char **argv)
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{
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strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
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argv0_buf[sizeof(argv0_buf) - 1] = 0;
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}
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int check_argc_exact(int nargs, int expected)
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{
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if (nargs < expected)
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fprintf(stderr, "%s: too few arguments\n", argv0_buf);
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if (nargs > expected)
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fprintf(stderr, "%s: too many arguments\n", argv0_buf);
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return nargs != expected;
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}
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int check_argc_min(int nargs, int expected)
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{
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if (nargs < expected) {
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fprintf(stderr, "%s: too few arguments\n", argv0_buf);
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return 1;
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}
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return 0;
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}
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int check_argc_max(int nargs, int expected)
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{
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if (nargs > expected) {
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fprintf(stderr, "%s: too many arguments\n", argv0_buf);
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return 1;
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}
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return 0;
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}
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/*
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* Preprocess @argv with getopt_long to reorder options and consume the "--"
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* option separator.
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* Unknown short and long options are reported, optionally the @usage is printed
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* before exit.
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*/
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void clean_args_no_options(int argc, char *argv[], const char * const *usagestr)
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{
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static const struct option long_options[] = {
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{NULL, 0, NULL, 0}
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};
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while (1) {
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int c = getopt_long(argc, argv, "", long_options, NULL);
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if (c < 0)
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break;
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switch (c) {
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default:
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if (usagestr)
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usage(usagestr);
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}
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}
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}
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/*
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* Same as clean_args_no_options but pass through arguments that could look
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* like short options. Eg. reisze which takes a negative resize argument like
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* '-123M' .
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*
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* This accepts only two forms:
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* - "-- option1 option2 ..."
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* - "option1 option2 ..."
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*/
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void clean_args_no_options_relaxed(int argc, char *argv[], const char * const *usagestr)
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{
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if (argc <= 1)
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return;
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if (strcmp(argv[1], "--") == 0)
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optind = 2;
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}
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static int do_usage_one_command(const char * const *usagestr,
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unsigned int flags, FILE *outf)
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{
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int pad = 4;
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const char *prefix = "usage: ";
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const char *pad_listing = " ";
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if (!usagestr || !*usagestr)
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return -1;
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if (flags & USAGE_LISTING)
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prefix = pad_listing;
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fputs(prefix, outf);
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if (strchr(*usagestr, '\n') == NULL) {
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fputs(*usagestr, outf);
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} else {
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const char *c = *usagestr;
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const char *nprefix = " ";
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if (flags & USAGE_LISTING)
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nprefix = pad_listing;
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for (c = *usagestr; *c; c++) {
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fputc(*c, outf);
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if (*c == '\n')
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fputs(nprefix, outf);
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}
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}
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usagestr++;
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/* a short one-line description (mandatory) */
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if ((flags & USAGE_SHORT) == 0)
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return 0;
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else if (!*usagestr)
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return -2;
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fputc('\n', outf);
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if (flags & USAGE_LISTING)
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pad = 8;
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else
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fputc('\n', outf);
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fprintf(outf, "%*s%s\n", pad, "", *usagestr++);
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/* a long (possibly multi-line) description (optional) */
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if (!*usagestr || ((flags & USAGE_LONG) == 0))
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return 0;
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if (**usagestr)
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fputc('\n', outf);
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while (*usagestr && **usagestr)
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fprintf(outf, "%*s%s\n", pad, "", *usagestr++);
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/* options (optional) */
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if (!*usagestr || ((flags & USAGE_OPTIONS) == 0))
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return 0;
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/*
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* options (if present) should always (even if there is no long
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* description) be prepended with an empty line, skip it
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*/
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usagestr++;
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fputc('\n', outf);
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while (*usagestr)
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fprintf(outf, "%*s%s\n", pad, "", *usagestr++);
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return 0;
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}
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static int usage_command_internal(const char * const *usagestr,
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const char *token, int full, int lst,
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int alias, FILE *outf)
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{
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unsigned int flags = 0;
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int ret;
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if (!alias)
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flags |= USAGE_SHORT;
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if (full)
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flags |= USAGE_LONG | USAGE_OPTIONS;
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if (lst)
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flags |= USAGE_LISTING;
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ret = do_usage_one_command(usagestr, flags, outf);
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switch (ret) {
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case -1:
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fprintf(outf, "No usage for '%s'\n", token);
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break;
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case -2:
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fprintf(outf, "No short description for '%s'\n", token);
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break;
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}
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return ret;
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}
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static void usage_command_usagestr(const char * const *usagestr,
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const char *token, int full, int err)
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{
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FILE *outf = err ? stderr : stdout;
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int ret;
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ret = usage_command_internal(usagestr, token, full, 0, 0, outf);
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if (!ret)
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fputc('\n', outf);
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}
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void usage_command(const struct cmd_struct *cmd, int full, int err)
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{
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usage_command_usagestr(cmd->usagestr, cmd->token, full, err);
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}
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__attribute__((noreturn))
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void usage(const char * const *usagestr)
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{
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usage_command_usagestr(usagestr, NULL, 1, 1);
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exit(1);
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}
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static void usage_command_group_internal(const struct cmd_group *grp, int full,
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FILE *outf)
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{
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const struct cmd_struct *cmd = grp->commands;
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int do_sep = 0;
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for (; cmd->token; cmd++) {
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if (cmd->flags & CMD_HIDDEN)
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continue;
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if (full && cmd != grp->commands)
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fputc('\n', outf);
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if (!cmd->next) {
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if (do_sep) {
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fputc('\n', outf);
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do_sep = 0;
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}
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usage_command_internal(cmd->usagestr, cmd->token, full,
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1, cmd->flags & CMD_ALIAS, outf);
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if (cmd->flags & CMD_ALIAS)
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putchar('\n');
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continue;
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}
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/* this is an entry point to a nested command group */
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if (!full && cmd != grp->commands)
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fputc('\n', outf);
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usage_command_group_internal(cmd->next, full, outf);
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if (!full)
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do_sep = 1;
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}
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}
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void usage_command_group_short(const struct cmd_group *grp)
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{
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const char * const *usagestr = grp->usagestr;
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FILE *outf = stdout;
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const struct cmd_struct *cmd;
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if (usagestr && *usagestr) {
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fprintf(outf, "usage: %s\n", *usagestr++);
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while (*usagestr)
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fprintf(outf, " or: %s\n", *usagestr++);
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}
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fputc('\n', outf);
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fprintf(outf, "Command groups:\n");
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for (cmd = grp->commands; cmd->token; cmd++) {
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if (cmd->flags & CMD_HIDDEN)
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continue;
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if (!cmd->next)
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continue;
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fprintf(outf, " %-16s %s\n", cmd->token, cmd->next->infostr);
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}
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fprintf(outf, "\nCommands:\n");
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for (cmd = grp->commands; cmd->token; cmd++) {
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if (cmd->flags & CMD_HIDDEN)
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continue;
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if (cmd->next)
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continue;
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fprintf(outf, " %-16s %s\n", cmd->token, cmd->usagestr[1]);
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}
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fputc('\n', outf);
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fprintf(stderr, "For an overview of a given command use 'btrfs command --help'\n");
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fprintf(stderr, "or 'btrfs [command...] --help --full' to print all available options.\n");
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fprintf(stderr, "Any command name can be shortened as far as it stays unambiguous,\n");
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fprintf(stderr, "however it is recommended to use full command names in scripts.\n");
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fprintf(stderr, "All command groups have their manual page named 'btrfs-<group>'.\n");
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}
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void usage_command_group(const struct cmd_group *grp, int full, int err)
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{
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const char * const *usagestr = grp->usagestr;
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FILE *outf = err ? stderr : stdout;
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if (usagestr && *usagestr) {
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fprintf(outf, "usage: %s\n", *usagestr++);
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while (*usagestr)
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fprintf(outf, " or: %s\n", *usagestr++);
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}
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fputc('\n', outf);
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usage_command_group_internal(grp, full, outf);
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fputc('\n', outf);
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if (grp->infostr)
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fprintf(outf, "%s\n", grp->infostr);
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}
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__attribute__((noreturn))
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void help_unknown_token(const char *arg, const struct cmd_group *grp)
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{
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fprintf(stderr, "%s: unknown token '%s'\n", get_argv0_buf(), arg);
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usage_command_group(grp, 0, 1);
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exit(1);
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}
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__attribute__((noreturn))
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void help_ambiguous_token(const char *arg, const struct cmd_group *grp)
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{
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const struct cmd_struct *cmd = grp->commands;
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fprintf(stderr, "%s: ambiguous token '%s'\n", get_argv0_buf(), arg);
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fprintf(stderr, "\nDid you mean one of these ?\n");
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for (; cmd->token; cmd++) {
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if (!prefixcmp(cmd->token, arg))
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fprintf(stderr, "\t%s\n", cmd->token);
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}
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exit(1);
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}
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void help_command_group(const struct cmd_group *grp, int argc, char **argv)
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{
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int full = 0;
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if (argc > 1) {
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if (!strcmp(argv[1], "--full"))
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full = 1;
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}
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usage_command_group(grp, full, 0);
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}
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