refactor(pcre): inline Preg into its call sites and drop the crate

Preg had shed everything it owned: after the last few rounds its methods
were one-line forwards to the shim's preg_*(), differing only in a
default argument or a wrapper the caller unwrapped anyway. The 460 call
sites now name the shim function, and shirabe-pcre is gone from the
workspace along with its LICENSE entry.

The forwards expand as they read: isMatch becomes
preg_match2(.., 0).is_some() (is_none() where PHP negates it), isMatch3
and match3 drop the .is_some(), matchAll counts through
preg_match_all2(..).occurrence_count(), and replace4/replace5 spell out
the limit and count arguments preg_replace2 takes. Callbacks are the one
place the shapes differ: preg_replace_callback carries an error out of
the callback, so the fourteen infallible closures wrap their result in
Ok() and expect() it back.

Config::process() is the fifteenth, and it drops the `error` cell it
captured to smuggle a failure past a closure that could only return a
String. The `?` in the closure now carries it, which is what the PHP
does -- a throw from the callback leaves preg_replace_callback at the
failing match rather than running the remaining replacements and
reporting the last error.

The module doc that explained why composer/pcre's exceptions and
*StrictGroups() variants have no counterpart moves to the shim's preg
module, where the functions it describes live.

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

1 files changed, 10 insertions, 7 deletions

diff --git a/crates/shirabe/src/repository/vcs/fossil_driver.rs b/crates/shirabe/src/repository/vcs/fossil_driver.rs
index 8ce479fd..c42ca271 100644
--- a/crates/shirabe/src/repository/vcs/fossil_driver.rs
+++ b/crates/shirabe/src/repository/vcs/fossil_driver.rs
@@ -11,10 +11,10 @@ use crate::util::Filesystem;
 use crate::util::ProcessExecutor;
 use chrono::{DateTime, FixedOffset, Utc};
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
 use shirabe_php_shim::Catch as _;
 use shirabe_php_shim::{
-    PhpMixed, RuntimeException, dirname, is_dir, is_file, is_writable, php_regex,
+    PhpMixed, RuntimeException, dirname, is_dir, is_file, is_writable, php_regex, preg_match2,
+    preg_replace,
 };
 
 #[derive(Debug)]
@@ -82,7 +82,7 @@ impl FossilDriver {
                 .into());
             }
 
-            let local_name = Preg::replace(php_regex!(r"{[^a-z0-9]}i"), "-", &self.inner.url);
+            let local_name = preg_replace(php_regex!(r"{[^a-z0-9]}i"), "-", &self.inner.url);
             self.repo_file = Some(format!("{}/{}.fossil", cache_repo_dir, local_name));
             self.checkout_dir = format!("{}/{}/", cache_vcs_dir, local_name);
 
@@ -286,7 +286,7 @@ impl FossilDriver {
                 Some(&self.checkout_dir),
             );
             for branch in self.inner.process.borrow().split_lines(&output) {
-                let branch = Preg::replace(php_regex!(r"/^\*/"), "", branch.trim());
+                let branch = preg_replace(php_regex!(r"/^\*/"), "", branch.trim());
                 let branch = branch.trim().to_string();
                 branches.insert(branch.clone(), branch);
             }
@@ -301,14 +301,17 @@ impl FossilDriver {
         url: &str,
         deep: bool,
     ) -> anyhow::Result<bool> {
-        if Preg::is_match(
+        if preg_match2(
             php_regex!(r"#(^(?:https?|ssh)://(?:[^@]@)?(?:chiselapp\.com|fossil\.))#i"),
             url,
-        ) {
+            0,
+        )
+        .is_some()
+        {
             return Ok(true);
         }
 
-        if Preg::is_match(php_regex!(r"!/fossil/|\.fossil!"), url) {
+        if preg_match2(php_regex!(r"!/fossil/|\.fossil!"), url, 0).is_some() {
             return Ok(true);
         }