Rollup merge of #128963 - GuillaumeGomez:output-to-stdout, r=aDotInTheVoid

Add possibility to generate rustdoc JSON output to stdout

Fixes #127165.

I think it's likely common to want to get rustdoc json output directly instead of reading it from a file so I added this option to allow it. It's unstable and only works with `--output-format=json`.

r? `@aDotInTheVoid`

1 files changed, 15 insertions, 0 deletions

diff --git a/src/tools/run-make-support/src/path_helpers.rs b/src/tools/run-make-support/src/path_helpers.rs
index b788bc6ef30..1e6e44c4584 100644
--- a/src/tools/run-make-support/src/path_helpers.rs
+++ b/src/tools/run-make-support/src/path_helpers.rs
@@ -84,3 +84,18 @@ pub fn has_suffix<P: AsRef<Path>>(path: P, suffix: &str) -> bool {
 pub fn filename_contains<P: AsRef<Path>>(path: P, needle: &str) -> bool {
     path.as_ref().file_name().is_some_and(|name| name.to_str().unwrap().contains(needle))
 }
+
+/// Helper for reading entries in a given directory and its children.
+pub fn read_dir_entries_recursive<P: AsRef<Path>, F: FnMut(&Path)>(dir: P, mut callback: F) {
+    fn read_dir_entries_recursive_inner<P: AsRef<Path>, F: FnMut(&Path)>(dir: P, callback: &mut F) {
+        for entry in rfs::read_dir(dir) {
+            let path = entry.unwrap().path();
+            callback(&path);
+            if path.is_dir() {
+                read_dir_entries_recursive_inner(path, callback);
+            }
+        }
+    }
+
+    read_dir_entries_recursive_inner(dir, &mut callback);
+}