Print a nicer error when failing to create cache directory

Same as in 1d22485 for the config
directory, when the cache directory fails to get created for whichever
reason, we currently exit gitui with a pretty undescriptive error.

Improves on #2684.
Fixes #2652.

Author: linkmauve

CHANGELOG.md

@@ -31,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixes
 * resolve `core.hooksPath` relative to `GIT_WORK_TREE` [[@naseschwarz](https://github.com/naseschwarz)] ([#2571](https://github.com/gitui-org/gitui/issues/2571))
 * yanking commit ranges no longer generates incorrect dotted range notations, but lists each individual commit [[@naseschwarz](https://github.com/naseschwarz)] (https://github.com/gitui-org/gitui/issues/2576)
+* print slightly nicer errors when failing to create a directory [[@linkmauve](https://github.com/linkmauve)] (https://github.com/gitui-org/gitui/pull/2728)
 
 ## [0.27.0] - 2024-01-14
 

src/args.rs

@@ -159,7 +159,12 @@ fn get_app_cache_path() -> Result<PathBuf> {
 		.ok_or_else(|| anyhow!("failed to find os cache dir."))?;
 
 	path.push("gitui");
-	fs::create_dir_all(&path)?;
+	fs::create_dir_all(&path).with_context(|| {
+		format!(
+			"failed to create cache directory: {}",
+			path.display()
+		)
+	})?;
 	Ok(path)
 }