bugfixes developed while writing blog post

diff --git a/mr b/mr
index 8eb0374babbca924fb65e2191f9c7a7ed64a707b..96f3a16cbd4f2332194823ae9126dcb1ba16faf6 100755 (executable)
--- a/mr
+++ b/mr
@@ -346,7 +346,7 @@ sub action {
 
        if (exists $config{$topdir}{$subdir}{deleted}) {
                if (! -d $dir) {
-                       next;
+                       return;
                }
                else {
                        my $test="set -e;".$lib.$config{$topdir}{$subdir}{deleted};
@@ -463,6 +463,10 @@ sub loadconfig {
                $dir="";
        }
        else {
+               if (! -e $f) {
+                       return;
+               }
+
                my $absf=abs_path($f);
                if ($loaded{$absf}) {
                        return;
@@ -551,14 +555,28 @@ sub modifyconfig {
        my %changefields=@_;
 
        my @lines;
+       my @out;
+
        if (-e $f) {
                open(my $in, "<", $f) || die "mr: open $f: $!\n";
                @lines=<$in>;
                close $in;
        }
 
+       my $addfields=sub {
+               my @blanks;
+               while ($out[$#out] =~ /^\s*$/) {
+                       unshift @blanks, pop @out;
+               }
+               foreach my $field (sort keys %changefields) {
+                       if (length $changefields{$field}) {
+                               push @out, "$field = $changefields{$field}\n";
+                       }
+               }
+               push @out, @blanks;
+       };
+
        my $section;
-       my @out;
        while (@lines) {
                $_=shift(@lines);
 
@@ -568,16 +586,7 @@ sub modifyconfig {
                elsif (/^\s*\[([^\]]*)\]\s*$/) {
                        if (defined $section && 
                            $section eq $targetsection) {
-                               my @blanks;
-                               while ($out[$#out] =~ /^\s*$/) {
-                                       unshift @blanks, pop @out;
-                               }
-                               foreach my $field (sort keys %changefields) {
-                                       if (length $changefields{$field}) {
-                                               push @out, "$field = $changefields{$field}\n";
-                                       }
-                               }
-                               push @out, @blanks;
+                               $addfields->();
                        }
 
                        $section=$1;
@@ -607,7 +616,11 @@ sub modifyconfig {
                }
        }
 
-       if (%changefields) {
+       if (defined $section && 
+           $section eq $targetsection) {
+                       $addfields->();
+       }
+       elsif (%changefields) {
                push @out, "\n[$targetsection]\n";
                foreach my $field (sort keys %changefields) {
                        if (length $changefields{$field}) {