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ruby.c: show_usage_line

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* ruby.c (show_usage_line): extract function to print one usage
  line.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50633 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-05-24 02:20:10 +00:00
parent 3de8b4bed1
commit e28addcf5b
1 changed files with 15 additions and 9 deletions
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24
ruby.c
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@ -130,6 +130,18 @@ static struct {
char **argv;
} origarg;
static void
show_usage_line(const char *str, unsigned int namelen, unsigned int secondlen, int help)
{
const unsigned int w = 16;
const int wrap = help && namelen + secondlen - 2 > w;
printf(" %.*s%-*.*s%-*s%s\n", namelen-1, str,
(wrap ? 0 : w - namelen + 1),
(help ? secondlen-1 : 0), str + namelen,
(wrap ? w + 3 : 0), (wrap ? "\n" : ""),
str + namelen + secondlen);
}
static void
usage(const char *name, int help)
{
@ -182,15 +194,9 @@ usage(const char *name, int help)
M("gems", "", "rubygems (default: "DEFAULT_RUBYGEMS_ENABLED")"),
M("rubyopt", "", "RUBYOPT environment variable (default: enabled)"),
};
int i, w = 16, num = numberof(usage_msg) - (help ? 1 : 0);
#define SHOW(m) do { \
int wrap = help && (m).namelen + (m).secondlen - 2 > w; \
printf(" %.*s%-*.*s%-*s%s\n", (m).namelen-1, (m).str, \
(wrap ? 0 : w - (m).namelen + 1), \
(help ? (m).secondlen-1 : 0), (m).str + (m).namelen, \
(wrap ? w + 3 : 0), (wrap ? "\n" : ""), \
(m).str + (m).namelen + (m).secondlen); \
} while (0)
int i;
const int num = numberof(usage_msg) - (help ? 1 : 0);
#define SHOW(m) show_usage_line((m).str, (m).namelen, (m).secondlen, help)
printf("Usage: %s [switches] [--] [programfile] [arguments]\n", name);
for (i = 0; i < num; ++i)