temp(submit): try out new commit message format

See arxanas#1462

git-branchless-lib/src/git/diff.rs

@@ -15,6 +15,15 @@ pub struct Diff<'repo> {
     pub(super) inner: git2::Diff<'repo>,
 }
 
+impl Diff<'_> {
+    /// TODO
+    pub fn short_stats(&self) -> eyre::Result<String> {
+        let stats = self.inner.stats()?;
+        let buf = stats.to_buf(git2::DiffStatsFormat::SHORT, usize::MAX)?;
+        Ok(buf.as_str().expect("TODO").trim().to_string())
+    }
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
 struct GitHunk {
     old_start: usize,

git-branchless/src/commands/split.rs

@@ -203,7 +203,18 @@ pub fn split(
             }
         }
     }
-    let message = message.expect("at least 1 file should have been given");
+    let message = {
+        let (effects, _progress) =
+            effects.start_operation(lib::core::effects::OperationType::CalculateDiff);
+        let diff = repo.get_diff_between_trees(
+            &effects,
+            Some(&commit_to_split.get_tree()?),
+            &split_tree,
+            0, // we don't care about the context here
+        )?;
+
+        diff.short_stats()?
+    };
 
     let split_commit_oid =
         commit_to_split.amend_commit(None, None, None, None, Some(&split_tree))?;

git-branchless/tests/test_split.rs

@@ -32,7 +32,7 @@ fn test_split_detached_head() -> eyre::Result<()> {
             |
             @ 2932db7 first commit
             |
-            o c159d6a temp(split): test2.txt
+            o 753c8a5 temp(split): 1 file changed, 1 deletion(-)
         "###);
     }
 
@@ -91,7 +91,7 @@ fn test_split_added_file() -> eyre::Result<()> {
             |
             @ 2f9e232 first commit
             |
-            o 067feb9 temp(split): test2.txt
+            o f26ed15 temp(split): 1 file changed, 1 deletion(-)
         "###);
     }
 
@@ -148,7 +148,7 @@ fn test_split_modified_file() -> eyre::Result<()> {
             |
             @ 495b4c0 first commit
             |
-            o 590b05e temp(split): test1.txt
+            o c41e243 temp(split): 1 file changed, 1 insertion(+), 1 deletion(-)
         "###);
     }
 
@@ -215,7 +215,7 @@ fn test_split_deleted_file() -> eyre::Result<()> {
             |
             @ 495b4c0 first commit
             |
-            o bfc063a temp(split): test1.txt
+            o 7cf0fa0 temp(split): 1 file changed, 1 insertion(+)
         "###);
     }
 
@@ -268,7 +268,7 @@ fn test_split_multiple_files() -> eyre::Result<()> {
             |
             @ 8e5c74b first commit
             |
-            o 0b1f3c6 temp(split): 2 files
+            o a3072f1 temp(split): 2 files changed, 2 deletions(-)
         "###);
     }
 
@@ -324,7 +324,7 @@ fn test_split_detached_branch() -> eyre::Result<()> {
             |
             @ 2932db7 (branch-name) first commit
             |
-            o c159d6a temp(split): test2.txt
+            o 753c8a5 temp(split): 1 file changed, 1 deletion(-)
         "###);
     }
 
@@ -368,7 +368,7 @@ fn test_split_attached_branch() -> eyre::Result<()> {
             |
             o 2932db7 first commit
             |
-            @ c159d6a (> branch-name) temp(split): test2.txt
+            @ 753c8a5 (> branch-name) temp(split): 1 file changed, 1 deletion(-)
         "###);
 
         let (stdout, _stderr) = git.run(&["status", "--short"])?;
@@ -407,17 +407,17 @@ fn test_split_restacks_descendents() -> eyre::Result<()> {
         let (stdout, _stderr) = git.branchless("split", &["HEAD~", "test2.txt"])?;
         insta::assert_snapshot!(&stdout, @r###"
             Attempting rebase in-memory...
-            [1/1] Committed as: 71d03a3 create test3.txt
+            [1/1] Committed as: 86f12ce create test3.txt
             branchless: processing 1 rewritten commit
-            branchless: running command: <git-executable> checkout 71d03a33c534eda4253fc8772a4c0d5e9515127c
+            branchless: running command: <git-executable> checkout 86f12ceba66a3bfc888cbdd090af9a4a581b6f2a
             In-memory rebase succeeded.
             O f777ecc (master) create initial.txt
             |
             o 2932db7 first commit
             |
-            o c159d6a temp(split): test2.txt
+            o 753c8a5 temp(split): 1 file changed, 1 deletion(-)
             |
-            @ 71d03a3 create test3.txt
+            @ 86f12ce create test3.txt
         "###);
     }
 
@@ -468,17 +468,17 @@ fn test_split_undo_works() -> eyre::Result<()> {
         let (stdout, _stderr) = git.branchless("split", &["HEAD~", "test2.txt"])?;
         insta::assert_snapshot!(&stdout, @r###"
             Attempting rebase in-memory...
-            [1/1] Committed as: 71d03a3 create test3.txt
+            [1/1] Committed as: 86f12ce create test3.txt
             branchless: processing 1 rewritten commit
-            branchless: running command: <git-executable> checkout 71d03a33c534eda4253fc8772a4c0d5e9515127c
+            branchless: running command: <git-executable> checkout 86f12ceba66a3bfc888cbdd090af9a4a581b6f2a
             In-memory rebase succeeded.
             O f777ecc (master) create initial.txt
             |
             o 2932db7 first commit
             |
-            o c159d6a temp(split): test2.txt
+            o 753c8a5 temp(split): 1 file changed, 1 deletion(-)
             |
-            @ 71d03a3 create test3.txt
+            @ 86f12ce create test3.txt
         "###);
     }
 
@@ -561,7 +561,7 @@ fn test_split_supports_absolute_relative_and_repo_relative_paths() -> eyre::Resu
             |
             @ d9d41a3 first commit
             |
-            o fc76a91 temp(split): subdir/test3.txt
+            o 9dd1584 temp(split): 1 file changed, 1 deletion(-)
         "###);
 
         let (stdout, _stderr) = git.run(&["show", "--pretty=format:", "--stat", "HEAD"])?;
@@ -593,7 +593,7 @@ fn test_split_supports_absolute_relative_and_repo_relative_paths() -> eyre::Resu
             |
             @ 0cb8154 first commit
             |
-            o 5d2c1d0 temp(split): subdir/test1.txt
+            o e75ab8c temp(split): 1 file changed, 1 deletion(-)
         "###);
 
         let (stdout, _stderr) = git.run(&["show", "--pretty=format:", "--stat", "HEAD"])?;
@@ -625,7 +625,7 @@ fn test_split_supports_absolute_relative_and_repo_relative_paths() -> eyre::Resu
             |
             @ 9122046 first commit
             |
-            o ba3abaf temp(split): test2.txt
+            o a3c3b69 temp(split): 1 file changed, 1 deletion(-)
         "###);
 
         let (stdout, _stderr) = git.run(&["show", "--pretty=format:", "--stat", "HEAD"])?;
@@ -657,7 +657,7 @@ fn test_split_supports_absolute_relative_and_repo_relative_paths() -> eyre::Resu
             |
             @ 6d0cd9b first commit
             |
-            o 2f03a38 temp(split): test1.txt
+            o df7bd3a temp(split): 1 file changed, 1 deletion(-)
         "###);
 
         let (stdout, _stderr) = git.run(&["show", "--pretty=format:", "--stat", "HEAD"])?;