1 files changed, 51 insertions, 0 deletions
diff --git a/smartfmt b/smartfmt
new file mode 100755
index 0000000..71ca8c7
--- /dev/null
+++ b/smartfmt
@@ -0,0 +1,51 @@
+#!/usr/bin/perl -w
+
+# wrapper for fmt, detects when every line has
+# the same prefix (or is blank) and passes the prefix
+# as a -p option to fmt. Called by ~/.vimrc, F mapping.
+
+sub shortest {
+	my $oldprefix = shift;
+	my $line = shift;
+	my $newprefix = "";
+
+	for(my $i = 0; $i < length($oldprefix) && $i < length($line); $i++) {
+		last if substr($line, $i, 1) ne substr($oldprefix, $i, 1);
+		$newprefix .= substr($line, $i, 1);
+	}
+
+	return $newprefix;
+}
+
+$nonblank = 0;
+while(<STDIN>) {
+	chomp;
+	s/^\s+$//;
+	push @lines, $_;
+	next if /^$/;
+
+	$nonblank++;
+
+	if(not defined $prefix) {
+		$prefix = $_;
+	} elsif($prefix ne "") {
+		$prefix = shortest($prefix, $_);
+	}
+}
+
+$width = 71;
+if($nonblank > 1 && $prefix ne "" && ($prefix =~ /[^A-Za-z]$/)) {
+	$opt = ' -p' . quotemeta($prefix) . ' ';
+	if(@ARGV && ($ARGV[0] eq '-s')) {
+		$width = (length($prefix) + 71);
+	}
+}
+
+$opt.= "-w $width -g $width";
+
+#warn "line: $_" for @lines;
+#warn "opt: $opt";
+
+open OUT,"|fmt $opt" or die $!;
+print OUT "$_\n" for @lines;
+close OUT;