feat: add Repository::big_file_threshold() to easily learn what Git considers a big file.

Author: Byron

gix/src/repository/config/mod.rs

@@ -42,6 +42,12 @@ impl crate::Repository {
         &self.options
     }
 
+    /// Return the big-file threshold above which Git will not perform a diff anymore or try to delta-diff packs,
+    /// as configured by `core.bigFileThreshold`, or the default value.
+    pub fn big_file_threshold(&self) -> Result<u64, config::unsigned_integer::Error> {
+        self.config.big_file_threshold()
+    }
+
     /// Obtain options for use when connecting via `ssh`.
     #[cfg(feature = "blocking-network-client")]
     pub fn ssh_connect_options(

gix/tests/fixtures/generated-archives/make_config_repos.tar

@@ -192,3 +192,8 @@ EOF
   echo $'[remote "any"]\n\turl=anyurl' >>config
 
 )
+
+git init big-file-threshold
+(cd big-file-threshold
+  git config core.bigFileThreshold 42
+)

gix/tests/fixtures/make_config_repos.sh

@@ -2,6 +2,21 @@ mod config_snapshot;
 mod identity;
 mod remote;
 
+#[test]
+#[cfg(feature = "blocking-network-client")]
+fn big_file_threshold() -> crate::Result {
+    let repo = repo("with-hasconfig");
+    assert_eq!(
+        repo.big_file_threshold()?,
+        512 * 1024 * 1024,
+        "Git really handles huge files, and this is the default"
+    );
+
+    let repo = crate::repository::config::repo("big-file-threshold");
+    assert_eq!(repo.big_file_threshold()?, 42, "It picks up configured values as well");
+    Ok(())
+}
+
 #[cfg(feature = "blocking-network-client")]
 mod ssh_options {
     use std::ffi::OsStr;