fewer temporary variables

we can `return` from an inner block, even when that block is executed
somewhere else: `return` is lexical!

1 files changed, 17 insertions, 18 deletions

diff --git a/lib/MaildirIndexer/Parser.rakumod b/lib/MaildirIndexer/Parser.rakumod
index 407078d..1762e58 100644
--- a/lib/MaildirIndexer/Parser.rakumod
+++ b/lib/MaildirIndexer/Parser.rakumod
@@ -61,34 +61,32 @@ my class Message-actions {
 }
 
 multi parse-email(IO::Path:D $p --> MaildirIndexer::Email) is export {
-    my MaildirIndexer::Email $result;
-    MaildirIndexer::LogTimelineSchema::Parse::Email::File.log: :file($p.path), -> {
+    MaildirIndexer::LogTimelineSchema::Parse::Email::File.log: :file($p.path), {
         # as of 2019,11, `slurp` replaces all \r\n with \n ??
-        $result = parse-email($p.slurp(:enc<utf8-c8>), path => $p);
+        return parse-email($p.slurp(:enc<utf8-c8>), path => $p);
     }
-    return $result;
 }
 
 multi parse-email(IO::Path:D $p, :$headers-only! --> MaildirIndexer::Email) is export {
-    my MaildirIndexer::Email $result;
-    MaildirIndexer::LogTimelineSchema::Parse::Email::File.log: :file($p.path), -> {
-        my IO::Handle $h = $p.open(
+    # due to a bug, we can't put that LEAVE inside the inner block;
+    # see https://github.com/rakudo/rakudo/issues/2380
+    my IO::Handle $h; LEAVE { .close with $h };
+    MaildirIndexer::LogTimelineSchema::Parse::Email::File.log: :file($p.path), {
+        $h = $p.open(
                 :enc<utf8-c8>,
                 :nl-in(@separators),
                 :!chomp,
         );
-        $result = parse-email(
+        return parse-email(
             $h.lines()[0],
             path => $p,
         );
-        $h.close();
     }
-    return $result;
 }
 
 multi parse-email(IO::Socket::Async:D $s --> MaildirIndexer::Email) is export {
-    my MaildirIndexer::Email $result;
-    MaildirIndexer::LogTimelineSchema::Parse::Email::Socket.log: -> {
+    MaildirIndexer::LogTimelineSchema::Parse::Email::Socket.log: {
+        my MaildirIndexer::Email $result;
         my $string;
         react {
             whenever $s.Supply(:enc<utf8-c8>) {
@@ -99,17 +97,18 @@ multi parse-email(IO::Socket::Async:D $s --> MaildirIndexer::Email) is export {
                 $result = parse-email($string) and done;
             }
         }
+        return $result;
     }
-    return $result;
 }
 
 multi parse-email(Str:D $email-str, :$path = IO --> MaildirIndexer::Email) is export {
-    my MaildirIndexer::Email $result;
-    MaildirIndexer::LogTimelineSchema::Parse::Email::Str.log: -> {
-        CATCH { warn $_; return Nil };
+    MaildirIndexer::LogTimelineSchema::Parse::Email::Str.log: {
+        CATCH { return .fail };
         with Message.parse($email-str,:actions(Message-actions.new(:$path))) {
-            $result = .made;
+            return .made;
+        }
+        else {
+            return Nil;
         }
     }
-    return $result;
 }