cli: use . in output for current directory instead of empty string

CHANGELOG.md

@@ -62,6 +62,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * You now get a proper error message instead of a crash when `$EDITOR` doesn't
   exist or exits with an error.
 
+* Fixed relative path to the current directory in output to be `.` instead of
+  empty string.
+
 ## [0.4.0] - 2022-04-02
 
 ### Breaking changes

src/ui.rs

@@ -190,13 +190,19 @@ pub fn relative_path(mut from: &Path, to: &Path) -> PathBuf {
     let mut result = PathBuf::from("");
     loop {
         if let Ok(suffix) = to.strip_prefix(from) {
-            return result.join(suffix);
+            result = result.join(suffix);
+            break;
         }
         if let Some(parent) = from.parent() {
             result = result.join("..");
             from = parent;
         } else {
-            return to.to_owned();
+            result = to.to_path_buf();
+            break;
         }
     }
+    if result.as_os_str().is_empty() {
+        result = PathBuf::from(".");
+    }
+    result
 }

tests/test_init_command.rs

@@ -117,8 +117,7 @@ fn test_init_git_colocated() {
     let workspace_root = test_env.env_root().join("repo");
     init_git_repo(&workspace_root);
     let stdout = test_env.jj_cmd_success(&workspace_root, &["init", "--git-repo", "."]);
-    // TODO: We should say "." instead of "" here
-    insta::assert_snapshot!(stdout, @r###"Initialized repo in ""
+    insta::assert_snapshot!(stdout, @r###"Initialized repo in "."
 "###);
 
     let jj_path = workspace_root.join(".jj");