print the usage string on stdout instead of stderr

diff --git a/parse-options.c b/parse-options.c
index 8546d8526f311e2a2703c258a4da3f02f8650df4..c8aaf95b4aad62e6d0e531c70862e540272a8e19 100644 (file)
--- a/parse-options.c
+++ b/parse-options.c
@@ -5,7 +5,7 @@
 #include "color.h"
 
 static int parse_options_usage(const char * const *usagestr,
-                              const struct option *opts);
+                              const struct option *opts, int err);
 
 #define OPT_SHORT 1
 #define OPT_UNSET 2
@@ -352,7 +352,7 @@ void parse_options_start(struct parse_opt_ctx_t *ctx,
 }
 
 static int usage_with_options_internal(const char * const *,
-                                      const struct option *, int);
+                                      const struct option *, int, int);
 
 int parse_options_step(struct parse_opt_ctx_t *ctx,
                       const struct option *options,
@@ -380,10 +380,10 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                if (arg[1] != '-') {
                        ctx->opt = arg + 1;
                        if (internal_help && *ctx->opt == 'h')
-                               return parse_options_usage(usagestr, options);
+                               return parse_options_usage(usagestr, options, 0);
                        switch (parse_short_opt(ctx, options)) {
                        case -1:
-                               return parse_options_usage(usagestr, options);
+                               return parse_options_usage(usagestr, options, 1);
                        case -2:
                                goto unknown;
                        }
@@ -391,10 +391,10 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                                check_typos(arg + 1, options);
                        while (ctx->opt) {
                                if (internal_help && *ctx->opt == 'h')
-                                       return parse_options_usage(usagestr, options);
+                                       return parse_options_usage(usagestr, options, 0);
                                switch (parse_short_opt(ctx, options)) {
                                case -1:
-                                       return parse_options_usage(usagestr, options);
+                                       return parse_options_usage(usagestr, options, 1);
                                case -2:
                                        /* fake a short option thing to hide the fact that we may have
                                         * started to parse aggregated stuff
@@ -418,12 +418,12 @@ int parse_options_step(struct parse_opt_ctx_t *ctx,
                }
 
                if (internal_help && !strcmp(arg + 2, "help-all"))
-                       return usage_with_options_internal(usagestr, options, 1);
+                       return usage_with_options_internal(usagestr, options, 1, 0);
                if (internal_help && !strcmp(arg + 2, "help"))
-                       return parse_options_usage(usagestr, options);
+                       return parse_options_usage(usagestr, options, 0);
                switch (parse_long_opt(ctx, arg + 2, options)) {
                case -1:
-                       return parse_options_usage(usagestr, options);
+                       return parse_options_usage(usagestr, options, 1);
                case -2:
                        goto unknown;
                }
@@ -468,7 +468,7 @@ int parse_options(int argc, const char **argv, const char *prefix,
        return parse_options_end(&ctx);
 }
 
-static int usage_argh(const struct option *opts)
+static int usage_argh(const struct option *opts, FILE *outfile)
 {
        const char *s;
        int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
@@ -479,72 +479,74 @@ static int usage_argh(const struct option *opts)
                        s = literal ? "[%s]" : "[<%s>]";
        else
                s = literal ? " %s" : " <%s>";
-       return fprintf(stderr, s, opts->argh ? opts->argh : "...");
+       return fprintf(outfile, s, opts->argh ? opts->argh : "...");
 }
 
 #define USAGE_OPTS_WIDTH 24
 #define USAGE_GAP         2
 
 static int usage_with_options_internal(const char * const *usagestr,
-                               const struct option *opts, int full)
+                               const struct option *opts, int full, int err)
 {
+       FILE *outfile = err ? stderr : stdout;
+
        if (!usagestr)
                return PARSE_OPT_HELP;
 
-       fprintf(stderr, "usage: %s\n", *usagestr++);
+       fprintf(outfile, "usage: %s\n", *usagestr++);
        while (*usagestr && **usagestr)
-               fprintf(stderr, "   or: %s\n", *usagestr++);
+               fprintf(outfile, "   or: %s\n", *usagestr++);
        while (*usagestr) {
-               fprintf(stderr, "%s%s\n",
+               fprintf(outfile, "%s%s\n",
                                **usagestr ? "    " : "",
                                *usagestr);
                usagestr++;
        }
 
        if (opts->type != OPTION_GROUP)
-               fputc('\n', stderr);
+               fputc('\n', outfile);
 
        for (; opts->type != OPTION_END; opts++) {
                size_t pos;
                int pad;
 
                if (opts->type == OPTION_GROUP) {
-                       fputc('\n', stderr);
+                       fputc('\n', outfile);
                        if (*opts->help)
-                               fprintf(stderr, "%s\n", opts->help);
+                               fprintf(outfile, "%s\n", opts->help);
                        continue;
                }
                if (!full && (opts->flags & PARSE_OPT_HIDDEN))
                        continue;
 
-               pos = fprintf(stderr, "    ");
+               pos = fprintf(outfile, "    ");
                if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
                        if (opts->flags & PARSE_OPT_NODASH)
-                               pos += fprintf(stderr, "%c", opts->short_name);
+                               pos += fprintf(outfile, "%c", opts->short_name);
                        else
-                               pos += fprintf(stderr, "-%c", opts->short_name);
+                               pos += fprintf(outfile, "-%c", opts->short_name);
                }
                if (opts->long_name && opts->short_name)
-                       pos += fprintf(stderr, ", ");
+                       pos += fprintf(outfile, ", ");
                if (opts->long_name)
-                       pos += fprintf(stderr, "--%s%s",
+                       pos += fprintf(outfile, "--%s%s",
                                (opts->flags & PARSE_OPT_NEGHELP) ?  "no-" : "",
                                opts->long_name);
                if (opts->type == OPTION_NUMBER)
-                       pos += fprintf(stderr, "-NUM");
+                       pos += fprintf(outfile, "-NUM");
 
                if (!(opts->flags & PARSE_OPT_NOARG))
-                       pos += usage_argh(opts);
+                       pos += usage_argh(opts, outfile);
 
                if (pos <= USAGE_OPTS_WIDTH)
                        pad = USAGE_OPTS_WIDTH - pos;
                else {
-                       fputc('\n', stderr);
+                       fputc('\n', outfile);
                        pad = USAGE_OPTS_WIDTH;
                }
-               fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
+               fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
        }
-       fputc('\n', stderr);
+       fputc('\n', outfile);
 
        return PARSE_OPT_HELP;
 }
@@ -552,7 +554,7 @@ static int usage_with_options_internal(const char * const *usagestr,
 void usage_with_options(const char * const *usagestr,
                        const struct option *opts)
 {
-       usage_with_options_internal(usagestr, opts, 0);
+       usage_with_options_internal(usagestr, opts, 0, 1);
        exit(129);
 }
 
@@ -565,9 +567,9 @@ void usage_msg_opt(const char *msg,
 }
 
 static int parse_options_usage(const char * const *usagestr,
-                              const struct option *opts)
+                              const struct option *opts, int err)
 {
-       return usage_with_options_internal(usagestr, opts, 0);
+       return usage_with_options_internal(usagestr, opts, 0, err);
 }