#!/bin/env perl

use strict;
use warnings;

use File::Temp;
use IO::Handle;
use File::Find;
use Getopt::Long;

my ($typedefs_file, $search_base, $excludes, $indent);
my %options = 
  (
   "typedefs=s" => \$typedefs_file,
   "search-base=s" => \$search_base,
   "excludes=s" => \$excludes,
   "indent=s" => \$indent,
  );
GetOptions(%options,@_) || die "bad command line";


# legacy settings
$typedefs_file  ||= shift;
$indent ||= $ENV{PGINDENT} || $ENV{INDENT} || "indent";

my @files;

File::Find::find(
			   {wanted => 
				sub { 
					my ($dev,$ino,$mode,$nlink,$uid,$gid);
					(($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
					  -f _ &&
						/^.*\.[ch]\z/s &&
						  push(@files,$File::Find::name);
				}
			   },
				 $search_base
				)
  if $search_base;

if ($excludes && @files)
{
	my $eh;
	my @excl;
	open($eh,$excludes) || die "opening $excludes";
	while (my $line = <$eh>)
	{
		chomp $line;
		my $rgx;
		eval " \$rgx = qr!$line!;";
	    @files = grep {$_ !~ /$rgx/} @files if $rgx;
	}
	close($eh);
}

my $indent_opts = 
  "-bad -bap -bc -bl -d0 -cdb -nce -nfc1 -di12 -i4 -l79 -lp -nip -npro -bbb";
my $extra_opts = "";

my $tdfile;
open($tdfile,$typedefs_file) || die "opening $typedefs_file: $!";
my @typedefs = <$tdfile>;
close($tdfile);
chomp @typedefs;
@typedefs = grep {! /^(FD_SET|date|interval|timestamp|ANY)$/ } @typedefs;

system('entab </dev/null >/dev/null');
if ( $? )
{
	print  STDERR 
	  "Go to the src/tools/entab directory and do 'make' and 'make install'.\n",
		"This will put the 'entab' command in your path.\n",
		  "Then run $0 again.\n";
    exit 1;
};
system("$indent -? </dev/null >/dev/null 2>&1");
if ( $? >>8  != 1 )
{
	print STDERR 
	  "You do not appear to have 'indent' installed on your system.\n";
    exit 1;
}

system ("$indent -gnu </dev/null >/dev/null 2>&1");
if ( $? == 0 )
{
	print STDERR
	  "You appear to have GNU indent rather than BSD indent.\n", 
		"See the pgindent/README file for a description of its problems.\n";
    $extra_opts = "-cdb -bli0 -npcs -cli4 -sc";
}
else
{
    $extra_opts = "-cli1"
}


foreach my $sourcefile (@files,@ARGV)
{
	indent_file($sourcefile,\@typedefs);
}


exit;

#########################################################


sub indent_file
{
	my $sourcename = shift;
	my $typedefs = shift;

	# print STDERR "indenting $sourcename\n";

	my $source = read_source($sourcename);

	# for use in dev diagnostics
	my $bsource = $source;

	# Convert // comments to /* */
	$source =~ s!^(\h*)//(.*)$!$1/* $2 */!gm;

	# Avoid bug that converts 'x =- 1' to 'x = -1'
    $source =~ s!=- !-= !g;

	# Mark some comments for special treatment later
    $source =~ s!/\* +---!/*---X_X!g;

	# 'else' followed by a single-line comment, followed by
	# a brace on the next line confuses BSD indent, so we push
	# the comment down to the next line, then later pull it
	# back up again.  Add space before _PGMV or indent will add
	# it for us.
	# AMD: A symptom of not getting this right is that you see errors like:
	# FILE: ../../../src/backend/rewrite/rewriteHandler.c
	# Error@2259: 
	# Stuff missing from end of file
    $source =~ s!(\}|\h)else\h*(/\*)(.*\*/)\h*$!$1else\n    $2 _PGMV$3!gm;

	# Indent multi-line after-'else' comment so BSD indent will move it
	# properly. We already moved down single-line comments above.  
	# Check for '*' to make sure we are not in a single-line comment that 
	# has other text on the line.
    $source =~ s!(\}|\h)else\h*(/\*[^*]*)\h*$!$1else\n    $2!gm;

	# remove trailing whitespace
	$source =~ s/\h+$//gm;

	# detab
	$source = detab($source);

	# Work around bug where function that defines no local variables misindents
	# switch() case lines and line after #else.  Do not do for struct/enum.

	# This could probably be written more perlishly. AMD
	# The original awk code puts the dummy line *before* the brace -
	# is that really what's wanted? It seems weird.  I put it after
	# and it seems to work better anyway. AMD
	my @srclines = split(/\n/,$source);
	foreach my $lno (1..$#srclines)
	{
		my $l2 = $srclines[$lno];
		next unless $l2 =~ /^\{\h*$/;
		my $l1 = $srclines[$lno - 1];
		# find first non-blank line before brace
		foreach my $l1no (reverse 0 .. $lno-2)
		{
			last if $l1 =~ /\S/;
			$l1 = $srclines[$l1no];
		}
		next if $l1 =~ m!=|/|^(struct|enum|\h*typedef|extern\h+"C")! ;
		$srclines[$lno] = "$l2\nint pgindent_func_no_var_fix;"
	}
	$source = join("\n",@srclines) . "\n"; # make sure there's a final NL

	# diff($bsource,$source,"-wu");

	# Prevent indenting of code in 'extern "C"' blocks.
	# we replace the braces with comments which we'll reverse later
	my $ec_start = '/* Open extern "C" */';
	my $ec_end = '/* Close extern "C" */';
	$source =~ 
	  s!(^#ifdef\h+__cplusplus.*\nextern\h+"C"\h*\n)\{\h*$!$1$ec_start!gm;
	$source =~ s!(^#ifdef\h+__cplusplus.*\n)\}\h*$!$1$ec_end!gm;

	# Protect backslashes in DATA().
    $source =~  s!^(DATA\(.*)$!/*$1*/!gm;

	# Protect wrapping in CATALOG().
    $source =~ s!^(CATALOG\(.*)$!/*$1*/!gm;

	$source =~ s!^\h+typedef enum!typedef enum!gm
	  if $sourcename =~ 'libpq-(fe|events).h$';

	# diff($bsource,$source,"-wu");

	# run indent
	$source = run_indent($sourcename, $source, $typedefs);
	return if $source eq "";
	
	# Restore DATA/CATALOG lines.
    $source =~ s!^/\*((DATA|CATALOG)\(.*)\*/$!$1!gm;

	# Remove tabs and retab with four spaces.
    $source = entab($source);

	#diff($bsource,$source,"-u");

	# put back braces for extern "C"
	$source =~ s!^/\* Open extern "C" \*/$!{!gm;
	$source =~ s!^/\* Close extern "C" \*/$!}!gm;

	# remove special comment marker
	$source =~ s!/\*---X_X!/* ---!g; 

	# Workaround indent bug for 'static'.
    $source =~ s!^static\h+!static !gm;

	# diff ($bsource,$source,"-u");

	# Remove too much indenting after closing brace.
    $source =~ s!^\}\t\h+!}\t!gm; 

	# Indent single-line after-'else' comment by only one tab.
    $source =~ s!(\}|\h)else\h+(/\*.*\*/)\h*$!$1else\t$2!gm;

  	# Pull in #endif comments.
    $source =~ s!^\#endif\h+/\*!#endif   /*!gm;

	# Work around misindenting of function with no variables defined.
	$source =~ s!^\h*int\h+pgindent_func_no_var_fix;\h*\n{1,2}!!gm;

	# Add space after comments that start on tab stops.
	# The original comment above doesn't describe what is actually done,
	# which is to insert a tab *before* a comment that's not preceded by
	# whitespace. I have preserved the behaviour. AMD.
    $source =~ s!(\S)(/\*.*\*/)$!$1\t$2!gm; 

	# Move trailing * in function return type.
    $source =~ s!^([A-Za-z_]\S*)\h+\*$!$1 *!gm;

	# Remove blank line between opening brace and block comment.
	$source =~ s!(\t*\{\n)\n(\h+/\*)$!$1$2!gm;

	# Pull up single-line comment after 'else' that was pulled down above
	$source =~ s!else\n\h+/\* _PGMV!else\t/*!g;

	# Remove trailing blank lines
	$source =~ s!\n+\z!\n!; 
	
	# Remove blank line(s) before #else, #elif, and #endif
	$source =~ s!\n\n+(\#else|\#elif|\#endif)!\n$1!g;

	# Add blank line before #endif if it is the last line in the file.
	$source =~ s!\n(#endif.*)\n\z!\n\n$1\n!;

	#  Move prototype names to the same line as return type.  Useful for ctags.
	#  Indent should do this, but it does not.  It formats prototypes just
	#  like real functions.

	my $ident = qr/[a-zA-Z_][a-zA-Z_0-9]*/;
	my $comment = qr!/\*.*\*/!;

	$source =~ s!
					(\n$ident[^(\n]*)\n                  # e.g. static void
					(
						$ident\(\n?                      # func_name( 
						(.*,(\h*$comment)?\n)*           # args b4 final ln
						.*\);(\h*$comment)?$             # final line
					)
				!$1 . (substr($1,-1,1) eq '*' ? '' : ' ') . $2!gmxe;


	# Fix indenting of typedef caused by __cplusplus in libpq-fe.h 
	# and libpq-events.h
	$source =~ s!^\h+typedef enum!typedef enum!gm
	  if $sourcename =~ 'libpq-(fe|events).h$';

	write_source($sourcename,$source);

}

sub read_source
{
	my $srcname = shift;
	my $srcfile;
	my $source;

	open($srcfile ,$srcname) || die "opening $srcname: $!";
	local($/)=undef;
	$source=<$srcfile>;
	close($srcfile);
	return $source;
}

sub write_source
{
	my $sourcename = shift;
	my $source = shift;
	my $fh;

	open($fh,">$sourcename") || die "opening $sourcename: $!";
	print $fh $source;
	close($fh);
}


sub run_indent
{
	my $srcname = shift;
	my $source = shift;
	my $typedefs = shift;

	# get the typedefs that occur in this source file
	my @srctypedefs = grep {$source =~ /\b$_\b/} @$typedefs;
	s/^/-T/ foreach (@srctypedefs);

	my $cmd = "$indent $indent_opts $extra_opts " . join(" ", @srctypedefs);
		

	my $fh = new File::Temp (TEMPLATE => "pgsrcXXXXX");
	my $filename = $fh->filename;
	print $fh $source;
	$fh->autoflush(1);

	my $indentout = `$cmd $filename 2>&1`;

	if ($? || length($indentout) > 0)
	{
		print STDERR  "FILE: $srcname\n",$indentout;
#		system("cat $filename >&2");
		return "";
	}

	unlink "$filename.BAK";

	my $nsrc;
	open($nsrc,$filename);
	local($/)=undef;
	$source=<$nsrc>;

	return $source;

}

# XXX Ideally we'd implement detab/entab in pure perl.

sub detab
{
	my $source = shift;
	my $fh = new File::Temp (TEMPLATE => "pgdetXXXXX");
	my $filename = $fh->filename;
	print $fh $source;
	$fh->autoflush(1);
	my $detab;
	open($detab,"detab -t4 -qc $filename |");
	local($/)=undef;
	$source = <$detab>;
	return $source;
}

sub entab
{
	my $source = shift;
	my $fh = new File::Temp (TEMPLATE => "pgentXXXXX");
	my $filename = $fh->filename;
	print $fh $source;
	$fh->autoflush(1);
	my $entab;
	open($entab,"detab -t8 -qc $filename | entab -t4 -qc |");
	local($/)=undef;
	$source = <$entab>;
	return $source;	
}


# for development diagnostics
sub diff
{
	my $before = shift;
	my $after = shift;
	my $flags = shift || "";


	print STDERR "running diff\n";
	my $bfh = new File::Temp (TEMPLATE => "pgdiffbXXXXX");
	my $afh = new File::Temp (TEMPLATE => "pgdiffaXXXXX");
	my $bfname = $bfh->filename;
	my $afname = $afh->filename;
	print $bfh $before;
	print $afh $after;
	$bfh->autoflush(1);
	$afh->autoflush(1);
	system("diff $flags $bfname $afname >&2");	
}