tools: commit missing support for _info ported flag.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

doc/ccanlint.1.txt

@@ -87,6 +87,10 @@ test, but happy:
   CCAN module must have '_info' file describing. No this score is 0.
   However, *ccanlint* question may help to write one.
 
+*info_ported*::
+  CCAN module '_info' can say 'ported' arg; if says '0' not ported, few tests
+  run.
+
 *depends_exist*::
   '_info' file CCAN other module without saying, must find. It is not score 0.
 

tools/depends.c

@@ -227,7 +227,7 @@ get_all_deps(const void *ctx, const char *dir, const char *style,
 	return deps;
 }
 
-/* Can return NULL: _info may not support 'libs'. */
+/* Can return NULL: _info may not support prop. */
 static char **get_one_prop(const void *ctx, const char *dir, const char *prop,
 			   char *(*get_info)(const void *ctx, const char *dir))
 {
@@ -282,6 +282,48 @@ char **get_cflags(const void *ctx, const char *dir,
 	return flags;
 }
 
+static bool get_one_ported(const void *ctx, const char *dir,
+			   char *(*get_info)(const void *ctx, const char *dir))
+{
+	char **ported = get_one_prop(ctx, dir, "ported", get_info);
+
+	/* No news is good news. */
+	if (!ported || tal_count(ported) == 0)
+		return true;
+
+	if (tal_count(ported) != 1)
+		errx(1, "%s/_info ported gave %zu lines, not one",
+		     dir, tal_count(ported));
+		
+	if (streq(ported[0], "1"))
+		return true;
+	else if (streq(ported[0], "0"))
+		return false;
+	errx(1, "%s/_info ported gave invalid output '%s'", dir, ported[0]);
+}
+
+bool get_ported(const void *ctx, const char *dir, bool recurse,
+		char *(*get_info)(const void *ctx, const char *dir))
+{
+	if (!get_one_ported(ctx, dir, get_info))
+		return false;
+
+	if (recurse) {
+		size_t i;
+		char **deps = get_deps(ctx, dir, "depends", true, get_info);
+		for (i = 0; deps[i]; i++) {
+			char *subdir;
+			if (!strstarts(deps[i], "ccan/"))
+				continue;
+
+			subdir = path_join(ctx, find_ccan_dir(dir), deps[i]);
+			if (!get_one_ported(ctx, subdir, get_info))
+				return false;
+		}
+	}
+	return true;
+}
+
 char **get_libs(const void *ctx, const char *dir, const char *style,
 		char *(*get_info)(const void *ctx, const char *dir))
 {

tools/tools.h

@@ -46,6 +46,9 @@ char **get_libs(const void *ctx, const char *dir, const char *style,
 char **get_cflags(const void *ctx, const char *dir,
 		char *(*get_info)(const void *ctx, const char *dir));
 
+bool get_ported(const void *ctx, const char *dir, bool recurse,
+		char *(*get_info)(const void *ctx, const char *dir));
+
 /* From tools.c */
 /* If set, print all commands run, all output they give and exit status. */
 extern bool tools_verbose;