From 6f392071ed416f1767e209f1d6c98b1d70447337 Mon Sep 17 00:00:00 2001
From: Luca Matei Pintilie <luca@lucamatei.com>
Date: Mon, 18 Sep 2023 17:58:17 +0200
Subject: Support empty XDG_CACHE_HOME environmental variable

Follow-up from e5b6e24a621, fixes a scenario in which XDG_CACHE_HOME is
set, but it's set to an empty string instead of a path.

From the documentation
>If $XDG_CACHE_HOME is [...] empty, a default equal to $HOME/.cache should be used.
https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

Signed-off-by: Luca Matei Pintilie <luca@lucamatei.com>
---
 src/main.rs | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 6c74669..c1f1311 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -108,6 +108,17 @@ fn main() {
 	require!(work())
 }
 
+fn get_default_config_path() -> PathBuf {
+	[
+		&env::var("HOME").unwrap_or_else(|_| {
+			err!("One of the XDG_CACHE_HOME or HOME variables must be set");
+		}),
+		".cache",
+	]
+	.iter()
+	.collect::<PathBuf>()
+}
+
 fn work() -> Result<(), io::Error> {
 	let (flags, rest) = match Flags::parse() {
 		Ok(a) => a,
@@ -182,15 +193,14 @@ fn work() -> Result<(), io::Error> {
 			.as_nanos()
 			.to_string();
 		let cache_base = match env::var("XDG_CACHE_HOME") {
-			Ok(s) => PathBuf::from(s),
-			_ => [
-				&env::var("HOME").unwrap_or_else(|_| {
-					err!("One of the XDG_CACHE_HOME or HOME variables must be set");
-				}),
-				".cache",
-			]
-			.iter()
-			.collect::<PathBuf>(),
+			Ok(s) => {
+				if s.is_empty() {
+					get_default_config_path()
+				} else {
+					PathBuf::from(s)
+				}
+			}
+			_ => get_default_config_path(),
 		};
 		let mmv_name = option_env!("MMV_NAME").unwrap_or(MMV_DEFAULT_NAME);
 		cache_dir = [
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