perf tools: Add support for exclusive option

Some options cannot be used at the same time.  To handle such options
add a new PARSE_OPT_EXCLUSIVE flag and show error message if more than
one of them is used.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1413990949-13953-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
index b601610..f62dee7 100644 (file)
--- a/tools/perf/util/parse-options.c
+++ b/tools/perf/util/parse-options.c
@@ -45,6 +45,23 @@ static int get_value(struct parse_opt_ctx_t *p,
        if (opt->flags & PARSE_OPT_DISABLED)
                return opterror(opt, "is not usable", flags);
 
+       if (opt->flags & PARSE_OPT_EXCLUSIVE) {
+               if (p->excl_opt) {
+                       char msg[128];
+
+                       if (((flags & OPT_SHORT) && p->excl_opt->short_name) ||
+                           p->excl_opt->long_name == NULL) {
+                               scnprintf(msg, sizeof(msg), "cannot be used with switch `%c'",
+                                         p->excl_opt->short_name);
+                       } else {
+                               scnprintf(msg, sizeof(msg), "cannot be used with %s",
+                                         p->excl_opt->long_name);
+                       }
+                       opterror(opt, msg, flags);
+                       return -3;
+               }
+               p->excl_opt = opt;
+       }
        if (!(flags & OPT_SHORT) && p->opt) {
                switch (opt->type) {
                case OPTION_CALLBACK:
@@ -345,13 +362,14 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                       const char * const usagestr[])
 {
        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
+       int excl_short_opt = 1;
+       const char *arg;
 
        /* we must reset ->opt, unknown short option leave it dangling */
        ctx->opt = NULL;
 
        for (; ctx->argc; ctx->argc--, ctx->argv++) {
-               const char *arg = ctx->argv[0];
-
+               arg = ctx->argv[0];
                if (*arg != '-' || !arg[1]) {
                        if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
                                break;
@@ -360,19 +378,21 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                }
 
                if (arg[1] != '-') {
-                       ctx->opt = arg + 1;
+                       ctx->opt = ++arg;
                        if (internal_help && *ctx->opt == 'h')
                                return usage_with_options_internal(usagestr, options, 0);
                        switch (parse_short_opt(ctx, options)) {
                        case -1:
-                               return parse_options_usage(usagestr, options, arg + 1, 1);
+                               return parse_options_usage(usagestr, options, arg, 1);
                        case -2:
                                goto unknown;
+                       case -3:
+                               goto exclusive;
                        default:
                                break;
                        }
                        if (ctx->opt)
-                               check_typos(arg + 1, options);
+                               check_typos(arg, options);
                        while (ctx->opt) {
                                if (internal_help && *ctx->opt == 'h')
                                        return usage_with_options_internal(usagestr, options, 0);
@@ -389,6 +409,8 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                                        ctx->argv[0] = strdup(ctx->opt - 1);
                                        *(char *)ctx->argv[0] = '-';
                                        goto unknown;
+                               case -3:
+                                       goto exclusive;
                                default:
                                        break;
                                }
@@ -404,19 +426,23 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                        break;
                }
 
-               if (internal_help && !strcmp(arg + 2, "help-all"))
+               arg += 2;
+               if (internal_help && !strcmp(arg, "help-all"))
                        return usage_with_options_internal(usagestr, options, 1);
-               if (internal_help && !strcmp(arg + 2, "help"))
+               if (internal_help && !strcmp(arg, "help"))
                        return usage_with_options_internal(usagestr, options, 0);
-               if (!strcmp(arg + 2, "list-opts"))
+               if (!strcmp(arg, "list-opts"))
                        return PARSE_OPT_LIST_OPTS;
-               if (!strcmp(arg + 2, "list-cmds"))
+               if (!strcmp(arg, "list-cmds"))
                        return PARSE_OPT_LIST_SUBCMDS;
-               switch (parse_long_opt(ctx, arg + 2, options)) {
+               switch (parse_long_opt(ctx, arg, options)) {
                case -1:
-                       return parse_options_usage(usagestr, options, arg + 2, 0);
+                       return parse_options_usage(usagestr, options, arg, 0);
                case -2:
                        goto unknown;
+               case -3:
+                       excl_short_opt = 0;
+                       goto exclusive;
                default:
                        break;
                }
@@ -428,6 +454,17 @@ unknown:
                ctx->opt = NULL;
        }
        return PARSE_OPT_DONE;
+
+exclusive:
+       parse_options_usage(usagestr, options, arg, excl_short_opt);
+       if ((excl_short_opt && ctx->excl_opt->short_name) ||
+           ctx->excl_opt->long_name == NULL) {
+               char opt = ctx->excl_opt->short_name;
+               parse_options_usage(NULL, options, &opt, 1);
+       } else {
+               parse_options_usage(NULL, options, ctx->excl_opt->long_name, 0);
+       }
+       return PARSE_OPT_HELP;
 }
 
 int parse_options_end(struct parse_opt_ctx_t *ctx)

diff --git a/tools/perf/util/parse-options.h b/tools/perf/util/parse-options.h
index b7c80db..97b153f 100644 (file)
--- a/tools/perf/util/parse-options.h
+++ b/tools/perf/util/parse-options.h
@@ -39,6 +39,7 @@ enum parse_opt_option_flags {
        PARSE_OPT_HIDDEN  = 8,
        PARSE_OPT_LASTARG_DEFAULT = 16,
        PARSE_OPT_DISABLED = 32,
+       PARSE_OPT_EXCLUSIVE = 64,
 };
 
 struct option;
@@ -174,6 +175,7 @@ struct parse_opt_ctx_t {
        const char **out;
        int argc, cpidx;
        const char *opt;
+       const struct option *excl_opt;
        int flags;
 };