mkfiles.pl

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#!/usr/bin/env perl
#
# Cross-platform Makefile generator.
#
# Reads the file `Recipe' to determine the list of generated
# executables and their component objects. Then reads the source
# files to compute #include dependencies. Finally, writes out the
# various target Makefiles.

# PuTTY specifics which could still do with removing:
#  - Mac makefile is not portabilised at all. Include directories
#    are hardwired, and also the libraries are fixed. This is
#    mainly because I was too scared to go anywhere near it.
#  - sbcsgen.pl is still run at startup.

use FileHandle;
use Cwd;

open IN, "Recipe" or do {
    # We want to deal correctly with being run from one of the
    # subdirs in the source tree. So if we can't find Recipe here,
    # try one level up.
    chdir "..";
    open IN, "Recipe" or die "unable to open Recipe file\n";
};

# HACK: One of the source files in `charset' is auto-generated by
# sbcsgen.pl. We need to generate that _now_, before attempting
# dependency analysis.
eval 'chdir "charset"; require "sbcsgen.pl"; chdir ".."';

@srcdirs = ("./");

$divert = undef; # ref to scalar in which text is currently being put
$help = ""; # list of newline-free lines of help text
$project_name = "project"; # this is a good enough default
%makefiles = (); # maps makefile types to output makefile pathnames
%makefile_extra = (); # maps makefile types to extra Makefile text
%programs = (); # maps prog name + type letter to listref of objects/resources
%groups = (); # maps group name to listref of objects/resources

while (<IN>) {
  # Skip comments (unless the comments belong, for example because
  # they're part of a diversion).
  next if /^\s*#/ and !defined $divert;

  chomp;
  split;
  if ($_[0] eq "!begin" and $_[1] eq "help") { $divert = \$help; next; }
  if ($_[0] eq "!end") { $divert = undef; next; }
  if ($_[0] eq "!name") { $project_name = $_[1]; next; }
  if ($_[0] eq "!srcdir") { push @srcdirs, $_[1]; next; }
  if ($_[0] eq "!makefile" and &mfval($_[1])) { $makefiles{$_[1]}=$_[2]; next;}
  if ($_[0] eq "!begin") {
      if (&mfval($_[1])) {
	  $divert = \$makefile_extra{$_[1]};
      } else {
	  $divert = \$dummy;
      }
      next;
  }
  # If we're gathering help text, keep doing so.
  if (defined $divert) { ${$divert} .= "$_\n"; next; }
  # Ignore blank lines.
  next if scalar @_ == 0;

  # Now we have an ordinary line. See if it's an = line, a : line
  # or a + line.
  @objs = @_;

  if ($_[0] eq "+") {
    $listref = $lastlistref;
    $prog = undef;
    die "$.: unexpected + line\n" if !defined $lastlistref;
  } elsif ($_[1] eq "=") {
    $groups{$_[0]} = [] if !defined $groups{$_[0]};
    $listref = $groups{$_[0]};
    $prog = undef;
    shift @objs; # eat the group name
  } elsif ($_[1] eq ":") {
    $listref = [];
    $prog = $_[0];
    shift @objs; # eat the program name
  } else {
    die "$.: unrecognised line type\n";
  }
  shift @objs; # eat the +, the = or the :

  while (scalar @objs > 0) {
    $i = shift @objs;
    if ($groups{$i}) {
      foreach $j (@{$groups{$i}}) { unshift @objs, $j; }
    } elsif (($i eq "[G]" or $i eq "[C]" or $i eq "[M]" or
              $i eq "[X]" or $i eq "[U]") and defined $prog) {
      $type = substr($i,1,1);
    } else {
      push @$listref, $i;
    }
  }
  if ($prog and $type) {
    die "multiple program entries for $prog [$type]\n"
        if defined $programs{$prog . "," . $type};
    $programs{$prog . "," . $type} = $listref;
  }
  $lastlistref = $listref;
}

close IN;

# Now retrieve the complete list of objects and resource files, and
# construct dependency data for them. While we're here, expand the
# object list for each program, and complain if its type isn't set.
@prognames = sort keys %programs;
%depends = ();
@scanlist = ();
foreach $i (@prognames) {
  ($prog, $type) = split ",", $i;
  # Strip duplicate object names.
  $prev = undef;
  @list = grep { $status = ($prev ne $_); $prev=$_; $status }
          sort @{$programs{$i}};
  $programs{$i} = [@list];
  foreach $j (@list) {
    # Dependencies for "x" start with "x.c".
    # Dependencies for "x.res" start with "x.rc".
    # Dependencies for "x.rsrc" start with "x.r".
    # Both types of file are pushed on the list of files to scan.
    # Libraries (.lib) don't have dependencies at all.
    if ($j =~ /^(.*)\.res$/) {
      $file = "$1.rc";
      $depends{$j} = [$file];
      push @scanlist, $file;
    } elsif ($j =~ /^(.*)\.rsrc$/) {
      $file = "$1.r";
      $depends{$j} = [$file];
      push @scanlist, $file;
    } elsif ($j =~ /\.lib$/) {
      # libraries don't have dependencies
    } else {
      $file = "$j.c";
      $depends{$j} = [$file];
      push @scanlist, $file;
    }
  }
}

# Scan each file on @scanlist and find further inclusions.
# Inclusions are given by lines of the form `#include "otherfile"'
# (system headers are automatically ignored by this because they'll
# be given in angle brackets). Files included by this method are
# added back on to @scanlist to be scanned in turn (if not already
# done).
#
# Resource scripts (.rc) can also include a file by means of a line
# ending `ICON "filename"'. Files included by this method are not
# added to @scanlist because they can never include further files.
#
# In this pass we write out a hash %further which maps a source
# file name into a listref containing further source file names.

%further = ();
while (scalar @scanlist > 0) {
  $file = shift @scanlist;
  next if defined $further{$file}; # skip if we've already done it
  $resource = ($file =~ /\.rc$/ ? 1 : 0);
  $further{$file} = [];
  $dirfile = &findfile($file);
  open IN, "$dirfile" or die "unable to open source file $file\n";
  while (<IN>) {
    chomp;
    /^\s*#include\s+\"([^\"]+)\"/ and do {
      push @{$further{$file}}, $1;
      push @scanlist, $1;
      next;
    };
    /ICON\s+\"([^\"]+)\"\s*$/ and do {
      push @{$further{$file}}, $1;
      next;
    }
  }
  close IN;
}

# Now we're ready to generate the final dependencies section. For
# each key in %depends, we must expand the dependencies list by
# iteratively adding entries from %further.
foreach $i (keys %depends) {
  %dep = ();
  @scanlist = @{$depends{$i}};
  foreach $i (@scanlist) { $dep{$i} = 1; }
  while (scalar @scanlist > 0) {
    $file = shift @scanlist;
    foreach $j (@{$further{$file}}) {
      if ($dep{$j} != 1) {
        $dep{$j} = 1;
        push @{$depends{$i}}, $j;
        push @scanlist, $j;
      }
    }
  }
#  printf "%s: %s\n", $i, join ' ',@{$depends{$i}};
}

# Validation of input.

sub mfval($) {
    my ($type) = @_;
    # Returns true if the argument is a known makefile type. Otherwise,
    # prints a warning and returns false;
    if (grep { $type eq $_ }
	("vc","vcproj","cygwin","borland","lcc","gtk","mpw")) {
	    return 1;
	}
    warn "$.:unknown makefile type '$type'\n";
    return 0;
}

# Utility routines while writing out the Makefiles.

sub dirpfx {
    my ($path) = shift @_;
    my ($sep) = shift @_;
    my $ret = "", $i;
    while (($i = index $path, $sep) >= 0) {
	$path = substr $path, ($i + length $sep);
	$ret .= "..$sep";
    }
    return $ret;
}

sub findfile {
  my ($name) = @_;
  my $dir, $i, $outdir = "";
  unless (defined $findfilecache{$name}) {
    $i = 0;
    foreach $dir (@srcdirs) {
      $outdir = $dir, $i++ if -f "$dir$name";
    }
    die "multiple instances of source file $name\n" if $i > 1;
    $findfilecache{$name} = $outdir . $name;
  }
  return $findfilecache{$name};
}

sub objects {
  my ($prog, $otmpl, $rtmpl, $ltmpl, $prefix, $dirsep) = @_;
  my @ret;
  my ($i, $x, $y);
  @ret = ();
  foreach $i (@{$programs{$prog}}) {
    $x = "";
    if ($i =~ /^(.*)\.(res|rsrc)/) {
      $y = $1;
      ($x = $rtmpl) =~ s/X/$y/;
    } elsif ($i =~ /^(.*)\.lib/) {
      $y = $1;
      ($x = $ltmpl) =~ s/X/$y/;
    } else {
      ($x = $otmpl) =~ s/X/$i/;
    }
    push @ret, $x if $x ne "";
  }
  return join " ", @ret;
}

sub splitline {
  my ($line, $width, $splitchar) = @_;
  my ($result, $len);
  $len = (defined $width ? $width : 76);
  $splitchar = (defined $splitchar ? $splitchar : '\\');
  while (length $line > $len) {
    $line =~ /^(.{0,$len})\s(.*)$/ or $line =~ /^(.{$len,}?\s(.*)$/;
    $result .= $1 . " ${splitchar}\n\t\t";
    $line = $2;
    $len = 60;
  }
  return $result . $line;
}

sub deps {
  my ($otmpl, $rtmpl, $prefix, $dirsep, $depchar, $splitchar) = @_;
  my ($i, $x, $y);
  my @deps, @ret;
  @ret = ();
  $depchar ||= ':';
  foreach $i (sort keys %depends) {
    if ($i =~ /^(.*)\.(res|rsrc)/) {
      next if !defined $rtmpl;
      $y = $1;
      ($x = $rtmpl) =~ s/X/$y/;
    } else {
      ($x = $otmpl) =~ s/X/$i/;
    }
    @deps = @{$depends{$i}};
    @deps = map {
      $_ = &findfile($_);
      s/\//$dirsep/g;
      $_ = $prefix . $_;
    } @deps;
    push @ret, {obj => $x, deps => [@deps]};
  }
  return @ret;
}

sub prognames {
  my ($types) = @_;
  my ($n, $prog, $type);
  my @ret;
  @ret = ();
  foreach $n (@prognames) {
    ($prog, $type) = split ",", $n;
    push @ret, $n if index($types, $type) >= 0;
  }
  return @ret;
}

sub progrealnames {
  my ($types) = @_;
  my ($n, $prog, $type);
  my @ret;
  @ret = ();
  foreach $n (@prognames) {
    ($prog, $type) = split ",", $n;
    push @ret, $prog if index($types, $type) >= 0;
  }
  return @ret;
}

sub manpages {
  my ($types,$suffix) = @_;

  # assume that all UNIX programs have a man page
  if($suffix eq "1" && $types =~ /X/) {
    return map("$_.1", &progrealnames($types));
  }
  return ();
}

# Now we're ready to output the actual Makefiles.

if (defined $makefiles{'cygwin'}) {
    $dirpfx = &dirpfx($makefiles{'cygwin'}, "/");

    ##-- CygWin makefile
    open OUT, ">$makefiles{'cygwin'}"; select OUT;
    print
    "# Makefile for $project_name under cygwin.\n".
    "#\n# This file was created by `mkfiles.pl' from the `Recipe' file.\n".
    "# DO NOT EDIT THIS FILE DIRECTLY; edit Recipe or mkfiles.pl instead.\n";
    # gcc command line option is -D not /D
    ($_ = $help) =~ s/=\/D/=-D/gs;
    print $_;
    print
    "\n".
    "# You can define this path to point at your tools if you need to\n".
    "# TOOLPATH = c:\\cygwin\\bin\\ # or similar, if you're running Windows\n".
    "# TOOLPATH = /pkg/mingw32msvc/i386-mingw32msvc/bin/\n".
    "CC = \$(TOOLPATH)gcc\n".
    "RC = \$(TOOLPATH)windres\n".
    "# Uncomment the following two lines to compile under Winelib\n".
    "# CC = winegcc\n".
    "# RC = wrc\n".
    "# You may also need to tell windres where to find include files:\n".
    "# RCINC = --include-dir c:\\cygwin\\include\\\n".
    "\n".
    &splitline("CFLAGS = -mno-cygwin -Wall -O2 -D_WINDOWS -DDEBUG -DWIN32S_COMPAT".
      " -D_NO_OLDNAMES -DNO_MULTIMON " .