Utilities/Scripts: Add temporary #pragma once conversion script

Utilities/Scripts/pragma-once.pl

+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use constant {
+  START => 0,
+  HAVE_IFNDEF => 1,
+  HAVE_DEFINE => 2,
+  HAVE_ENDIF => 3,
+  HAVE_PRAGMA_ONCE => 4,
+};
+my $state = START;
+my $blank_count = 0;
+my $endif = '';
+while (<>) {
+  if ($state == START) {
+    if (/^#ifndef [a-zA-Z_][a-zA-Z0-9_]*$/) {
+      $state = HAVE_IFNDEF;
+      print "#pragma once\n";
+    } else {
+      if (/^#pragma once$/) {
+        $state = HAVE_PRAGMA_ONCE;
+      }
+      print;
+    }
+  } elsif ($state == HAVE_IFNDEF) {
+    if (/^#define [a-zA-Z_][a-zA-Z0-9_]*$/) {
+      $blank_count = 0;
+      $state = HAVE_DEFINE;
+    } else {
+      print;
+    }
+  } elsif ($state == HAVE_DEFINE) {
+    if (/^#endif/) {
+      $endif = $_;
+      $state = HAVE_ENDIF;
+    } elsif (/^$/) {
+      $blank_count++;
+    } else {
+      for (my $i = 0; $i < $blank_count; $i++) {
+        print "\n";
+      }
+      $blank_count = 0;
+      print;
+    }
+  } elsif ($state == HAVE_ENDIF) {
+    for (my $i = 0; $i < $blank_count; $i++) {
+      print "\n";
+    }
+    $blank_count = 0;
+    print $endif;
+    $state = HAVE_DEFINE;
+    if (/^#endif/) {
+      $endif = $_;
+      $state = HAVE_ENDIF;
+    } elsif (/^$/) {
+      $blank_count++;
+    } else {
+      print;
+    }
+  } elsif ($state == HAVE_PRAGMA_ONCE) {
+    print;
+  }
+  if (eof) {
+    if ($state != HAVE_ENDIF && $state != HAVE_PRAGMA_ONCE) {
+      print STDERR "Malformed header file: $ARGV\n";
+      exit 1;
+    }
+    $state = START;
+    $blank_count = 0;
+  }
+}

Utilities/Scripts/pragma-once.sh

+#!/bin/sh
+
+files=$(git ls-files \
+  'Source/*.h' \
+  'Source/*.h.in' \
+  'Source/*.hxx' \
+  'Utilities/cm3p/*.h' \
+  'Utilities/cmThirdParty.h.in' \
+  'Utilities/std/cm' \
+  'Utilities/std/cmext' \
+  'Utilities/std/cmSTL.hxx.in' \
+  | grep -v '^Source/CPack/cmCPackConfigure\.h\.in$' \
+  | grep -v '^Source/cmCPluginAPI\.h$' \
+  | grep -v '^Source/cmVersionConfig\.h\.in$' \
+  | grep -v '^Source/CursesDialog/form/' \
+  | grep -v '^Source/LexerParser/' \
+  | grep -v '^Source/kwsys/' \
+  | grep -v '\.cxx$' \
+)
+
+perl -i Utilities/Scripts/pragma-once.pl $files