mu-options: expand option file paths

Fixes #2528

mu/mu-options.cc

@@ -236,7 +236,8 @@ sub_extract(CLI::App& sub, Options& opts)
 	sub.add_option("--target-dir", opts.extract.targetdir,
 		       "Target directory for saving")
 		->type_name("<dir>")
-		->default_str("<current>")->default_val(".");
+		->default_str("<current>")->default_val(".")
+		->transform(ExpandPath, "expand path");
 	sub.add_option("message", opts.extract.message,
 		       "Path to message file")->required()
 		->type_name("<message-path>");
@@ -339,7 +340,8 @@ sub_find(CLI::App& sub, Options& opts)
 		     "Clear old links first");
 	sub.add_option("--linksdir", opts.find.linksdir,
 		       "Use bookmarked query")
-		->type_name("<dir>");
+		->type_name("<dir>")
+		->transform(ExpandPath, "expand path");
 
 	sub.add_option("--summary-len", opts.find.summary_len,
 		       "Use up to so many lines for the summary")
@@ -384,7 +386,8 @@ sub_init(CLI::App& sub, Options& opts)
 {
 	sub.add_option("--maildir,-m", opts.init.maildir,
 		       "Top of the maildir")
-		->type_name("<maildir>");
+		->type_name("<maildir>")
+		->transform(ExpandPath, "expand path");
 	sub.add_option("--my-address", opts.init.my_addresses,
 		       "Personal e-mail addresses")
 		->type_name("<address>");
@@ -700,7 +703,8 @@ There is NO WARRANTY, to the extent permitted by law.
 			sub->add_option("--muhome",
 					opts.muhome, "Specify alternative mu directory")
 				->envname("MUHOME")
-				->type_name("<dir>");
+				->type_name("<dir>")
+				->transform(ExpandPath, "expand path");
 	 }
 
 	 /* add scripts (if supported) as semi-subscommands as well */