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Honor COLUMNS [Feature #16754]

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This commit is contained in:
Nobuyoshi Nakada 2020-04-12 13:00:27 +09:00
parent cc68d2fbd0
commit a07cbacd23
Notes: git 2020-04-12 14:58:37 +09:00
1 changed files with 9 additions and 6 deletions
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15
ruby.c
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@ -245,11 +245,10 @@ static const char esc_reset[] = "\033[0m";
static const char esc_none[] = "";
static void
show_usage_line(const char *str, unsigned int namelen, unsigned int secondlen, int help, int highlight)
show_usage_line(const char *str, unsigned int namelen, unsigned int secondlen, int help, int highlight, unsigned int w)
{
const char *sb = highlight ? esc_bold : esc_none;
const char *se = highlight ? esc_reset : esc_none;
const unsigned int w = 16;
const int wrap = help && namelen + secondlen - 1 > w;
printf(" %s%.*s%-*.*s%s%-*s%s\n", sb, namelen-1, str,
(wrap ? 0 : w - namelen + 1),
@ -259,7 +258,7 @@ show_usage_line(const char *str, unsigned int namelen, unsigned int secondlen, i
}
static void
usage(const char *name, int help, int highlight)
usage(const char *name, int help, int highlight, int columns)
{
/* This message really ought to be max 23 lines.
* Removed -h because the user already knows that option. Others? */
@ -340,7 +339,8 @@ usage(const char *name, int help, int highlight)
const char *sb = highlight ? esc_standout+1 : esc_none;
const char *se = highlight ? esc_reset : esc_none;
const int num = numberof(usage_msg) - (help ? 1 : 0);
#define SHOW(m) show_usage_line((m).str, (m).namelen, (m).secondlen, help, highlight)
unsigned int w = (columns > 80 ? (columns - 79) / 2 : 0) + 16;
#define SHOW(m) show_usage_line((m).str, (m).namelen, (m).secondlen, help, highlight, w)
printf("%sUsage:%s %s [switches] [--] [programfile] [arguments]\n", sb, se, name);
for (i = 0; i < num; ++i)
@ -1624,10 +1624,13 @@ process_options(int argc, char **argv, ruby_cmdline_options_t *opt)
(argc > 0 && argv && argv[0] ? argv[0] :
origarg.argc > 0 && origarg.argv && origarg.argv[0] ? origarg.argv[0] :
ruby_engine);
int columns = 0;
if ((opt->dump & DUMP_BIT(help)) && tty) {
const char *pager_env = getenv("RUBY_PAGER");
if (!pager_env) pager_env = getenv("PAGER");
if (pager_env && *pager_env && isatty(0)) {
const char *columns_env = getenv("COLUMNS");
if (columns_env) columns = atoi(columns_env);
VALUE pager = rb_str_new_cstr(pager_env);
#ifdef HAVE_WORKING_FORK
int fds[2];
@ -1661,7 +1664,7 @@ process_options(int argc, char **argv, ruby_cmdline_options_t *opt)
dup2(fd, 1);
dup2(fd, 2);
/* more.com doesn't support CSI sequence */
usage(progname, 1, 0);
usage(progname, 1, 0, columns);
fflush(stdout);
dup2(oldout, 1);
dup2(olderr, 2);
@ -1671,7 +1674,7 @@ process_options(int argc, char **argv, ruby_cmdline_options_t *opt)
#endif
}
}
usage(progname, (opt->dump & DUMP_BIT(help)), tty);
usage(progname, (opt->dump & DUMP_BIT(help)), tty, columns);
return Qtrue;
}