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btrfs-progs: help: print multiple syntax schemas on separate lines

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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>
This commit is contained in:
David Sterba 2017-10-17 19:39:47 +02:00
parent eebdf02321
commit c56d61883c
1 changed files with 22 additions and 2 deletions
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24
help.c
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@ -128,12 +128,32 @@ static int do_usage_one_command(const char * const *usagestr,
unsigned int flags, FILE *outf) unsigned int flags, FILE *outf)
{ {
int pad = 4; int pad = 4;
const char *prefix = "usage: ";
const char *pad_listing = " ";
if (!usagestr || !*usagestr) if (!usagestr || !*usagestr)
return -1; return -1;
fprintf(outf, "%s%s", (flags & USAGE_LISTING) ? " " : "usage: ", if (flags & USAGE_LISTING)
*usagestr++); prefix = pad_listing;
fputs(prefix, outf);
if (strchr(*usagestr, '\n') == NULL) {
fputs(*usagestr, outf);
} else {
const char *c = *usagestr;
const char *nprefix = " ";
if (flags & USAGE_LISTING)
nprefix = pad_listing;
for (c = *usagestr; *c; c++) {
fputc(*c, outf);
if (*c == '\n')
fputs(nprefix, outf);
}
}
usagestr++;
/* a short one-line description (mandatory) */ /* a short one-line description (mandatory) */
if ((flags & USAGE_SHORT) == 0) if ((flags & USAGE_SHORT) == 0)