refactor(pcre): hand back the match instead of copying it out

Preg::match4 and Preg::replace_callback gave callers a
PregMatchedGroups: an IndexMap rebuilt from the match with an owned
String per group, plus a second String for a named group's name key.
That is the copy PregMatches shed when it started wrapping
regex::Captures, reinstated one layer up -- and nearly every regex call
in the tree goes through Preg rather than the shim's preg_* directly, so
almost nothing saw the borrow.

PregMatchedGroups existed only to drop the null (unmatched) groups the
old PregMatches held as Option<String> values. PregMatches::get reports
a non-participating group as None on its own, so the two read alike and
the type collapses into it. Call sites still reach groups through
get(&CaptureKey::ByIndex(N)); what changes is that the value arrives as
a &str borrowed from the subject, which the signatures now carry as a
lifetime.

Three places needed the borrow reckoned with rather than a mechanical
rewrite: PhpFileCleaner::clean and Problem::get_messages read their
groups out before mutating what the match borrows, and
Git::get_authentication_failure names the lifetime of its url argument,
which the result borrows instead of self.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/crates/shirabe/src/json/json_file.rs b/crates/shirabe/src/json/json_file.rs
index ca8b11e0..2d1185e8 100644
--- a/crates/shirabe/src/json/json_file.rs
+++ b/crates/shirabe/src/json/json_file.rs
@@ -450,11 +450,8 @@ impl JsonFile {
             let indent_owned = options.indent;
             return Ok(Preg::replace_callback(
                 php_regex!(r"#^ {4,}#m"),
-                move |m: &shirabe_pcre::PregMatchedGroups| -> String {
-                    let whole = m
-                        .get(&shirabe_pcre::CaptureKey::ByIndex(0))
-                        .map(|s| s.as_str())
-                        .unwrap_or("");
+                move |m: &shirabe_pcre::PregMatches| -> String {
+                    let whole = m.get(&shirabe_pcre::CaptureKey::ByIndex(0)).unwrap_or("");
                     str_repeat(&indent_owned, (strlen(whole) / 4) as usize)
                 },
                 &json,
@@ -555,7 +552,10 @@ impl JsonFile {
 
     pub fn detect_indenting(json: Option<&str>) -> String {
         if let Some(m) = Preg::is_match3(php_regex!(r##"#^([ \t]+)"#m"##), json.unwrap_or("")) {
-            return m.get(&CaptureKey::ByIndex(1)).cloned().unwrap_or_default();
+            return m
+                .get(&CaptureKey::ByIndex(1))
+                .unwrap_or_default()
+                .to_string();
         }
 
         Self::INDENT_DEFAULT.to_string()