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+#!/usr/bin/perl -w
+#
+# Script to convert .hx file STEXI/ETEXI blocks to SRST/ERST
+#
+# Copyright (C) 2020 Linaro
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# (at your option) any later version. See the COPYING file in the
+# top-level directory.
+
+# This script was only ever intended as a one-off conversion operation.
+# Please excuse the places where it is a bit hacky.
+# Some manual intervention after the conversion is expected, as are
+# some warnings from makeinfo.
+# Warning: this script is not idempotent: don't try to run it on
+# a .hx file that already has SRST/ERST sections.
+
+# Expected usage:
+# scripts/hxtool-conv.pl file.hx > file.hx.new
+
+use utf8;
+
+my $reading_texi = 0;
+my $texiblock = '';
+my @tables = ();
+
+sub update_tables($) {
+ my ($texi) = @_;
+ # Update our list of open table directives: every @table
+ # line in the texi fragment is added to the list, and every
+ # @end table line means we remove an entry from the list.
+ # If this fragment had a completely self contained table with
+ # both the @table and @end table lines, this will be a no-op.
+ foreach (split(/\n/, $texi)) {
+ push @tables, $_ if /^\@table/;
+ pop @tables if /^\@end table/;
+ }
+}
+
+sub only_table_directives($) {
+ # Return true if every line in the fragment is a start or end table directive
+ my ($texi) = @_;
+ foreach (split(/\n/, $texi)) {
+ return 0 unless /^\@table/ or /^\@end table/;
+ }
+ return 1;
+}
+
+sub output_rstblock($) {
+ # Write the output to /tmp/frag.texi, wrapped in whatever current @table
+ # lines we need.
+ my ($texi) = @_;
+
+ # As a special case, if this fragment is only table directives and
+ # nothing else, update our set of open table directives but otherwise
+ # ignore it. This avoids emitting an empty SRST/ERST block.
+ if (only_table_directives($texi)) {
+ update_tables($texi);
+ return;
+ }
+
+ open(my $fragfh, '>', '/tmp/frag.texi');
+ # First output the currently active set of open table directives
+ print $fragfh join("\n", @tables);
+ # Next, update our list of open table directives.
+ # We need to do this before we emit the closing table directives
+ # so that we emit the right number if this fragment had an
+ # unbalanced set of directives.
+ update_tables($texi);
+ # Then emit the texi fragment itself.
+ print $fragfh "\n$texi\n";
+ # Finally, add the necessary closing table directives.
+ print $fragfh "\@end table\n" x scalar @tables;
+ close $fragfh;
+
+ # Now invoke makeinfo/pandoc on it and slurp the results into a string
+ open(my $fh, '-|', "makeinfo --force -o - --docbook "
+ . "-D 'qemu_system_x86 QEMU_SYSTEM_X86_MACRO' "
+ . "-D 'qemu_system QEMU_SYSTEM_MACRO' /tmp/frag.texi "
+ . " | pandoc -f docbook -t rst")
+ or die "can't start makeinfo/pandoc: $!";
+
+ binmode $fh, ':encoding(utf8)';
+
+ print "SRST\n";
+
+ # Slurp the whole thing into a string so we can do multiline
+ # string matches on it.
+ my $rst = do {
+ local $/ = undef;
+ <$fh>;
+ };
+ $rst =~ s/^- − /- /gm;
+ $rst =~ s/“/"/gm;
+ $rst =~ s/”/"/gm;
+ $rst =~ s/‘/'/gm;
+ $rst =~ s/’/'/gm;
+ $rst =~ s/QEMU_SYSTEM_MACRO/|qemu_system|/g;
+ $rst =~ s/QEMU_SYSTEM_X86_MACRO/|qemu_system_x86|/g;
+ $rst =~ s/(?=::\n\n +\|qemu)/.. parsed-literal/g;
+ $rst =~ s/:\n\n::$/::/gm;
+
+ # Fix up the invalid reference format makeinfo/pandoc emit:
+ # `Some string here <#anchorname>`__
+ # should be:
+ # :ref:`anchorname`
+ $rst =~ s/\`[^<`]+\<\#([^>]+)\>\`__/:ref:`$1`/gm;
+ print $rst;
+
+ close $fh or die "error on close: $!";
+ print "ERST\n";
+}
+
+# Read the whole .hx input file.
+while (<>) {
+ # Always print the current line
+ print;
+ if (/STEXI/) {
+ $reading_texi = 1;
+ $texiblock = '';
+ next;
+ }
+ if (/ETEXI/) {
+ $reading_texi = 0;
+ # dump RST version of block
+ output_rstblock($texiblock);
+ next;
+ }
+ if ($reading_texi) {
+ # Accumulate the texi into a string
+ # but drop findex entries as they will confuse makeinfo
+ next if /^\@findex/;
+ $texiblock .= $_;
+ }
+}
+
+die "Unexpectedly still in texi block at EOF" if $reading_texi;