mirror of https://gitee.com/openkylin/linux.git
perf tools: Setup pager when printing usage and help
It's annoying to see error or help message when command has many options like in perf record, report or top. So setup pager when print parser error or help message - it should be OK since no UI is enabled at the parsing time. The usage_with_options() already disables it by calling exit_browser() anyway. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1445701767-12731-3-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -7,6 +7,8 @@
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#define OPT_SHORT 1
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#define OPT_SHORT 1
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#define OPT_UNSET 2
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#define OPT_UNSET 2
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static struct strbuf error_buf = STRBUF_INIT;
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static int opterror(const struct option *opt, const char *reason, int flags)
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static int opterror(const struct option *opt, const char *reason, int flags)
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{
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{
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if (flags & OPT_SHORT)
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if (flags & OPT_SHORT)
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@ -540,9 +542,11 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
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exit(130);
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exit(130);
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default: /* PARSE_OPT_UNKNOWN */
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default: /* PARSE_OPT_UNKNOWN */
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if (ctx.argv[0][1] == '-') {
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if (ctx.argv[0][1] == '-') {
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error("unknown option `%s'", ctx.argv[0] + 2);
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strbuf_addf(&error_buf, "unknown option `%s'",
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ctx.argv[0] + 2);
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} else {
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} else {
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error("unknown switch `%c'", *ctx.opt);
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strbuf_addf(&error_buf, "unknown switch `%c'",
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*ctx.opt);
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}
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}
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usage_with_options(usagestr, options);
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usage_with_options(usagestr, options);
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}
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}
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@ -711,6 +715,13 @@ int usage_with_options_internal(const char * const *usagestr,
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if (!usagestr)
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if (!usagestr)
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return PARSE_OPT_HELP;
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return PARSE_OPT_HELP;
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setup_pager();
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if (strbuf_avail(&error_buf)) {
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fprintf(stderr, " Error: %s\n", error_buf.buf);
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strbuf_release(&error_buf);
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}
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fprintf(stderr, "\n Usage: %s\n", *usagestr++);
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fprintf(stderr, "\n Usage: %s\n", *usagestr++);
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while (*usagestr && **usagestr)
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while (*usagestr && **usagestr)
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fprintf(stderr, " or: %s\n", *usagestr++);
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fprintf(stderr, " or: %s\n", *usagestr++);
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