cmdutils: Add -buildconf option.

The output is formatted to display one option per line.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

cmdutils.c

@@ -1079,6 +1079,32 @@ static void print_program_info(int flags, int level)
     av_log(NULL, level, "%sconfiguration: " FFMPEG_CONFIGURATION "\n", indent);
 }
 
+static void print_buildconf(int flags, int level)
+{
+    const char *indent = flags & INDENT? "  " : "";
+    char str[] = { FFMPEG_CONFIGURATION };
+    char *conflist, *remove_tilde, *splitconf;
+
+    // Change all the ' --' strings to '~--' so that
+    // they can be identified as tokens.
+    while( (conflist = strstr(str, " --")) != NULL ) {
+        strncpy(conflist, "~--", 3);
+    }
+
+    // Compensate for the weirdness this would cause
+    // when passing 'pkg-config --static'.
+    while( (remove_tilde = strstr(str, "pkg-config~")) != NULL ) {
+        strncpy(remove_tilde, "pkg-config ",11);
+    }
+
+    splitconf = strtok(str, "~");
+    av_log(NULL, level, "\n%sconfiguration:\n",indent);
+    while(splitconf != NULL) {
+        av_log(NULL, level, "%s%s%s\n", indent, indent, splitconf);
+        splitconf = strtok(NULL, "~");
+    }
+}
+
 void show_banner(int argc, char **argv, const OptionDef *options)
 {
     int idx = locate_option(argc, argv, options, "version");
@@ -1099,6 +1125,14 @@ int show_version(void *optctx, const char *opt, const char *arg)
     return 0;
 }
 
+int show_buildconf(void *optctx, const char *opt, const char *arg)
+{
+    av_log_set_callback(log_callback_help);
+    print_buildconf      (INDENT|0, AV_LOG_INFO);
+
+    return 0;
+}
+
 int show_license(void *optctx, const char *opt, const char *arg)
 {
 #if CONFIG_NONFREE