X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?p=subdirmk.git;a=blobdiff_plain;f=subdirmk%2Fgenerate;h=486bdc54e1c888b7be9cee539918296651cc8010;hp=857e768cd494b317ba14b0f8851fbec11362c787;hb=6600b10418c5c38d43bf6c732724123ed34779b6;hpb=8d746a1d7b875ae2118247d08e944f2fd7700e8a

diff --git a/subdirmk/generate b/subdirmk/generate
index 857e768..486bdc5 100755
--- a/subdirmk/generate
+++ b/subdirmk/generate
@@ -1,22 +1,34 @@
 #!/usr/bin/perl -w
 #
-# $(srcdir)/build-aux/subdirmk-setup SUBDIR...
+# subdirmk - &-filter (makefile generation program)
+#  Copyright 2019 Ian Jackson
+# SPDX-License-Identifier: LGPL-2.0-or-later
 #
-# generates
-#   main.mk.tmp
-# and in each subdirectory
-#   Subdir.mk.tmp
-#   Makefile
+# $(srcdir)/subdirmk/generate [--srcdir=SRCDIR] [--] SUBDIR...
+#
+# generates in each subdirectory	from in each subdirectory
+#     Subdir.mk.tmp			    Subdir.sd.mk
+#     Makefile                          and included files
+# and in toplevel			and in toplevel
+#     main.mk.tmp			    Perdir.sd.mk
 
 use strict;
+use POSIX;
 
-our $srcdir;
-our @subdirs = @ARGV;
+print "$0 @ARGV\n" or die $!;
 
-die unless $ARGV[0] eq '--srcdir';
-die unless @ARGV>=2;
-shift @ARGV;
-($srcdir, @subdirs) = @ARGV;
+our $srcdir='.';
+
+while (@ARGV && $ARGV[0] =~ m/^-/) {
+    $_ = shift @ARGV;
+    last if $_ eq '--';
+    if (s/^--srcdir=//) {
+	$srcdir=$';
+    } else {
+	die "$0: unknown option \`$_'\n";
+    }
+}
+our @subdirs = @ARGV;
 
 s{/+$}{} foreach @subdirs;
 
@@ -44,7 +56,9 @@ sub target_varname ($$) {
 }
 
 our $writing_output;
+our $buffering_output;
 our %output_files;
+our %input_files;
 
 sub close_any_output_file() {
     return unless defined $writing_output;
@@ -54,6 +68,10 @@ sub close_any_output_file() {
 }
 
 sub o {
+    if (defined $buffering_output) {
+	$buffering_output .= $_ foreach @_;
+	return;
+    }
     die unless defined $writing_output;
     print O @_ or die "error writing $writing_output.tmp: $!\n";
 }
@@ -81,41 +99,52 @@ sub write_makefile ($$) {
     my $cd = $depth ? join('/', ('..',) x $depth) : '.';
     o <<END;
 default: all
-	\@: \$@
 %:	FORCE-ALWAYS-RUN
-	\$(MAKE) -C $cd -f main.mk ${dir_prefix}\$@
+	\@:
 Makefile FORCE-ALWAYS-RUN:
-	\@: \$@
+	\$(MAKE) -C $cd -f main.mk \$(addprefix ${dir_prefix},\$(or \$(MAKECMDGOALS),all))
 .SUFFIXES:
+.PHONY:	FORCE-ALWAYS-RUN
 END
 }
 
-sub filter_subdir_mk ($$$$$) {
+sub process_input_mk ($$$$$$$$);
+sub process_input_mk ($$$$$$$$) {
     my ($dir_prefix, $dir_suffix, $dir_name,
-	$var_prefix, $targets) = @_;
+	$var_prefix, $targets,
+	$f, $esclitr, $enoent_ok) = @_;
 
-    #use Data::Dumper;
-    #print STDERR "filter @_\n";
+    my $caps_re = qr{[A-Z]};
+    my $lc_re = qr{[a-z]};
 
-    my $in = "${dir_prefix}Subdir.mk.in";
-    my $caps_re = qr{[A-Z][0-9_A-Z]*(?=\W)};
-    my $lc_re = qr{[a-z][-+,0-9_a-z]*(?=\W)};
-    my $esclit = '&';
-    my $esc = '\\&';
+    my $esc;
+    my $set_esc = sub {
+	$esc = $$esclitr;
+	$esc =~ s/\W/\\$&/g;
+    };
+    $set_esc->();
 
-    for my $f ($in, "Perdir.mk.in") {
-      open I, '<', $f or die "open $f: $!\n";
-      while (<I>) {
+    my $input = new IO::File $f, '<';
+    if (!$input) {
+	die "open $f: $!\n" unless $!==ENOENT && $enoent_ok;
+	return;
+    }
+    $input_files{$f}++;
+
+    while (<$input>) {
+	if (s#^\s*$esc\:##) {
+	    $buffering_output='';
+	}
 	for (;;) {
 	    unless (s{^(.*?)(\\)?(?=$esc)}{}) { o $_; last; }
 	    o $1;
-	    if ($2) { o $esclit; next; }
+	    if ($2) { o $$esclitr; next; }
 	    s{^$esc}{} or die "$_ ?";
-	    if (s{^$esc}{}) { o "$esclit$esclit" }
+	    if (s{^$esc}{}) { o "$$esclitr$$esclitr" }
 	    elsif (s{^TARGETS(?:_([0-9a-zA-Z_]+))?(?=\W)}{}) {
 		my $t = $1 // 'all';
 		o target_varname($var_prefix, $t);
-		$targets->{$t}=1;
+		$targets->{$t} //= [ ];
 	    }
 	    elsif (m{^(?=$caps_re)}) { o $var_prefix }
 	    elsif (m{^(?=$lc_re)}) { o $dir_prefix }
@@ -136,20 +165,53 @@ sub filter_subdir_mk ($$$$$) {
 		s{(?<=[ \t])(?=\S)(?!\\\s*$)}{$prefix}g;
 		o $_;
 		$_ = $after;
+	    } elsif (s{^\#}{}) {
+		$_ = '';
 	    } elsif (s{^![ \t]+}{}) {
 		o $_;
 		$_ = '';
-	    } elsif (s{^!(\pPosixWord+|\pPosixPunct+)[ \t]*}{}) {
-		$esclit = $1;
-		$esc = $esclit;
-		$esc =~ s/\W/\\$&/g;
+	    } elsif (s{^!(\S+)(?:[ \t]+|$)}{}) {
+		$$esclitr = $1;
+		$set_esc->();
 	    } else {
-		die "bad escape $esclit$_ ";
+		die "bad escape $$esclitr$_ ";
+	    }
+	}
+	if (defined $buffering_output) {
+	    $_=$buffering_output;
+	    $buffering_output=undef;
+	    if (m#^(-?)include\s+(\S+)\s+$#) {
+		my $subf = "$srcdir/$2";
+		process_input_mk($dir_prefix, $dir_suffix, $dir_name,
+				 $var_prefix, $targets,
+				 $subf, $esclitr, $1);
+		o "\n";
+	    } else {
+		die "unknown directive $_ ";
 	    }
 	}
-      }
-      I->error and die "read $f: $!\n";
     }
+    $input->error and die "read $f: $!\n";
+    close $input or die "close $f: $!\n";
+}
+
+sub filter_subdir_mk ($$$$$) {
+    my ($dir_prefix, $dir_suffix, $dir_name,
+	$var_prefix, $targets) = @_;
+
+    #use Data::Dumper;
+    #print STDERR "filter @_\n";
+
+    my $esclit = '&';
+
+    my $pi = sub {
+	my ($f, $enoentok) = @_;
+	process_input_mk($dir_prefix, $dir_suffix, $dir_name,
+			 $var_prefix, $targets,
+			 "${srcdir}/$f", \$esclit, $enoentok);
+    };
+    $pi->("${dir_prefix}Subdir.sd.mk", 0);
+    $pi->("Perdir.sd.mk",              1);
 }
 
 sub process_subtree ($$);
@@ -168,12 +230,12 @@ sub process_subtree ($$) {
 
     write_makefile($dir_prefix, scalar @$path);
 
-    my %targets = qw(all 1);
-    my @child_subdirs;
+    my %targets = (all => []);
     foreach my $child (@{ $node->[1] }) {
 	my @childpath = (@$path, $child->[0]);
-	push @child_subdirs, join '/', @childpath;
-	$targets{$_}++ foreach
+	my $child_subdir = join '/', @childpath;
+	mkdir $child_subdir or $!==EEXIST or die "mkdir $child_subdir: $!";
+	push @{ $targets{$_} }, $child_subdir foreach
 	    process_subtree($child, \@childpath);
     }
     start_output_file("${dir_prefix}Subdir.mk.tmp");
@@ -186,13 +248,13 @@ sub process_subtree ($$) {
     my @targets = sort keys %targets;
     foreach my $target (@targets) {
 	my $target_varname = target_varname($var_prefix, $target);
-	print O "${dir_prefix}${target}: \$($target_varname)";
-	foreach my $child_subdir (@child_subdirs) {
+	print O "${dir_prefix}${target}:: \$($target_varname)";
+	foreach my $child_subdir (@{ $targets{$target} }) {
 	    print O " $child_subdir/$target";
 	}
 	print O "\n";
     }
-    
+
     return @targets;
 }
 
@@ -206,6 +268,9 @@ sub process_tree() {
     foreach my $subdir (@subdirs) {
 	o "MAKEFILES += $subdir/Subdir.mk\n";
     }
+    foreach my $input (sort keys %input_files) {
+	o "MAKEFILE_TEMPLATES += $input\n";
+    }
     o "include \$(MAKEFILES)";
 }