Rename pgindent options

--show-diff becomes --diff, and --silent-diff becomes --check. These
options may now be given together. Without --check, --diff will exit
with a zero status even if diffs are found. With --check, it will now
exit with a non-zero status in that case.

Author: Tristan Partin
Reviewed-by: Daniel Gustafsson, Jelte Fennema-Nio

Discussion: https://postgr.es/m/CXLX2XYTH9S6.140SC6Y61VD88@neon.tech

Author: adunstan

src/tools/pgindent/pgindent

@@ -22,8 +22,8 @@ my $indent_opts =
 my $devnull = File::Spec->devnull;
 
 my ($typedefs_file, $typedef_str, @excludes,
-	$indent, $build, $show_diff,
-	$silent_diff, $help, @commits,);
+	$indent, $build, $diff,
+	$check, $help, @commits,);
 
 $help = 0;
 
@@ -34,15 +34,12 @@ my %options = (
 	"list-of-typedefs=s" => \$typedef_str,
 	"excludes=s" => \@excludes,
 	"indent=s" => \$indent,
-	"show-diff" => \$show_diff,
-	"silent-diff" => \$silent_diff,);
+	"diff" => \$diff,
+	"check" => \$check,);
 GetOptions(%options) || usage("bad command line argument");
 
 usage() if $help;
 
-usage("Cannot have both --silent-diff and --show-diff")
-  if $silent_diff && $show_diff;
-
 usage("Cannot use --commit with command line file list")
   if (@commits && @ARGV);
 
@@ -294,7 +291,7 @@ sub run_indent
 	return $source;
 }
 
-sub show_diff
+sub diff
 {
 	my $indented = shift;
 	my $source_filename = shift;
@@ -323,8 +320,8 @@ Options:
 	--list-of-typedefs=STR  string containing typedefs, space separated
 	--excludes=PATH         file containing list of filename patterns to ignore
 	--indent=PATH           path to pg_bsd_indent program
-	--show-diff             show the changes that would be made
-	--silent-diff           exit with status 2 if any changes would be made
+	--diff                  show the changes that would be made
+	--check                 exit with status 2 if any changes would be made
 The --excludes and --commit options can be given more than once.
 EOF
 	if ($help)
@@ -375,6 +372,7 @@ warn "No files to process" unless @files;
 process_exclude();
 
 my %processed;
+my $status = 0;
 
 foreach my $source_filename (@files)
 {
@@ -417,19 +415,24 @@ foreach my $source_filename (@files)
 
 	if ($source ne $orig_source)
 	{
-		if ($silent_diff)
-		{
-			exit 2;
-		}
-		elsif ($show_diff)
+		if (!$diff && !$check)
 		{
-			print show_diff($source, $source_filename);
+			write_source($source, $source_filename);
 		}
 		else
 		{
-			write_source($source, $source_filename);
+			if ($diff)
+			{
+				print diff($source, $source_filename);
+			}
+
+			if ($check)
+			{
+				$status = 2;
+				last unless $diff;
+			}
 		}
 	}
 }
 
-exit 0;
+exit $status;

src/tools/pgindent/pgindent.man

@@ -31,13 +31,13 @@ find the file src/tools/pgindent/exclude_file_patterns. The --excludes option
 can be used more than once to specify multiple files containing exclusion
 patterns.
 
-There are also two non-destructive modes of pgindent. If given the --show-diff
+There are also two non-destructive modes of pgindent. If given the --diff
 option pgindent will show the changes it would make, but doesn't actually make
-them. If given instead the --silent-diff option, pgindent will exit with a
-status of 2 if it finds any indent changes are required, but will not
-make the changes or give any other information. This mode is intended for
-possible use in a git pre-commit hook. An example of its use in a git hook
-can be seen at https://wiki.postgresql.org/wiki/Working_with_Git#Using_git_hooks
+them. If given instead the --check option, pgindent will exit with a status of
+2 if it finds any indent changes are required, but will not make the changes.
+This mode is intended for possible use in a git pre-commit hook. The --check
+and --diff options can be combined. An example of its use in a git hook can be
+seen at https://wiki.postgresql.org/wiki/Working_with_Git#Using_git_hooks
 
 Any non-option arguments are taken as the names of files to be indented. In this
 case only these files will be changed, and nothing else will be touched.