Fixed bug #48658: --linebuffer --files.

src/parallel

@@ -8086,20 +8086,28 @@ sub print {
 }
 
 sub files_print {
+    # Print the name of the file containing stdout on stdout
+    # Uses:
+    #   $opt::pipe
+    #   $opt::group = Print when job is done
+    #   $opt::linebuffer = Print ASAP
+    # Returns: N/A
     my $self = shift;
     my ($fdno,$in_fh,$out_fd) = @_;
 
-    # If the job is dead: close printing fh. Needed for --compress
-    close $self->fh($fdno,"w");
-    if($? and $opt::compress) {
-	::error($opt::compress_program." failed.");
-	$self->set_exitstatus(255);
+    if($opt::group and defined $self->{'exitstatus'}) {
+	# If the job is dead: close printing fh. Needed for --compress
+	close $self->fh($fdno,"w");
+	if($? and $opt::compress) {
+	    ::error($opt::compress_program." failed.");
+	    $self->set_exitstatus(255);
+	}
+	if($opt::compress) {
+	    # Kill the decompressor which will not be needed
+	    CORE::kill "TERM", $self->fh($fdno,"rpid");
+	}
+	close $in_fh;
     }
-    if($opt::compress) {
-	# Kill the decompressor which will not be needed
-	CORE::kill "TERM", $self->fh($fdno,"rpid");
-    }
-    close $in_fh;
 	
     if($opt::pipe and $self->virgin()) {
 	# Nothing was printed to this job:
@@ -8115,6 +8123,8 @@ sub files_print {
 				 $self->tag().$self->fh($fdno,"name"));
 	}
 	$self->add_returnsize(-s $self->fh($fdno,"name"));
+	# Mark as printed - do not print again
+	$self->set_fh($fdno,"name",undef);
     }
 }
 

src/parallel.pod

@@ -4798,6 +4798,28 @@ B<orgalorg> has a progress indicator for the transferring of a
 file. GNU B<parallel> does not.
 
 
+=head2 DIFFERENCES BETWEEN Rust parallel AND GNU Parallel
+
+Rust parallel implements a few features from GNU B<parallel>, but
+lacks many functions. All of these fail:
+
+  # -q to protect quoted $ and space
+  parallel -q perl -e '$a=shift; print "$a"x10000000' ::: a b c
+  # Argument is command
+  parallel {} 10 ::: echo seq
+  # Generation of combination of inputs
+  parallel echo {1} {2} ::: red green blue ::: S M L XL XXL
+  # Composed commands
+  parallel echo {} '|' wc ::: a
+  # Output is mixed
+  parallel (-q) perl -e 'print"{}"x10000000' ::: a b c |
+    perl -pe '$_=join "\n",split //, $_' | uniq -c
+  # Show what would be executed
+  parallel --dry-run echo ::: a
+
+Rust parallel has no remote facilities.
+
+
 =head2 DIFFERENCES BETWEEN ClusterSSH AND GNU Parallel
 
 ClusterSSH solves a different problem than GNU B<parallel>.

src/parallel_design.pod

@@ -696,8 +696,8 @@ into the file by the size of a block and then reading until it meets
 end of a block. The seeking explains why GNU B<parallel> does not know
 the line number and why B<-L/-l> and B<-N> do not work.
 
-With a reasonable block and file size this seeking is often more than
-1000 faster than reading the full file. The byte positions are then
+With a reasonable block and file size this seeking is more than 1000
+time faster than reading the full file. The byte positions are then
 given to a small script that reads from position X to Y and sends
 output to standard output (stdout). This small script is prepended to
 the command and the full command is executed just as if GNU
@@ -787,8 +787,8 @@ The results are here:
 GNU B<parallel> is pretty much limited by the speed of the disk: Up to
 6 GB data is written to disk but cached, so reading is fast. Above 6
 GB data are both written and read from disk. When the 30000MB job is
-running, the disk system is slow, but not completely unusable: If you are
-not using the disk, you almost do not feel it.
+running, the disk system is slow, but usable: If you are not using the
+disk, you almost do not feel it.
 
 B<gargs> has a speed advantage up until 2500M where it hits a
 wall. Then the system starts swapping like crazy and is completely

testsuite/tests-to-run/parallel-local-0.3s.sh

@@ -641,6 +641,12 @@ echo '### bug #48745: :::+ bug'
 
 echo '**'
 
+echo '### bug #48658: --linebuffer --files'
+
+  parallel --files --linebuffer 'sleep .1;seq {};sleep .1' ::: {1..10} | wc -l
+
+echo '**'
+
 EOF
 echo '### 1 .par file from --files expected'
 find /tmp{/*,}/*.{par,tms,tmx} 2>/dev/null -mmin -10 | wc -l

testsuite/wanted-results/parallel-local-0.3s

@@ -1759,5 +1759,11 @@ echo '### bug #48745: :::+ bug'
 3 23 c cc
 echo '**'
 **
+echo '### bug #48658: --linebuffer --files'
+### bug #48658: --linebuffer --files
+  parallel --files --linebuffer 'sleep .1;seq {};sleep .1' ::: {1..10} | wc -l
+10
+echo '**'
+**
 ### 1 .par file from --files expected
 0