+sub _colors_help ($$) {
+ my ($ctx, $txt) = @_;
+ my $ibx = $ctx->{-inbox};
+ my $env = $ctx->{env};
+ my $base_url = $ibx->base_url($env);
+ $$txt .= "color customization for $base_url\n";
+ $$txt .= <<EOF;
+
+public-inbox provides a stable set of CSS classes for users to
+customize colors for highlighting diffs and code.
+
+Users of browsers such as dillo, Firefox, or some browser
+extensions may start by downloading the following sample CSS file
+to control the colors they see:
+
+ ${base_url}userContent.css
+
+CSS sample
+----------
+```css
+EOF
+ $$txt .= PublicInbox::UserContent::sample($ibx, $env) . "```\n";
+}
+
+# git-config section names are quoted in the config file, so escape them
+sub dq_escape ($) {
+ my ($name) = @_;
+ $name =~ s/\\/\\\\/g;
+ $name =~ s/"/\\"/g;
+ $name;
+}
+
+sub URI_PATH () { '^A-Za-z0-9\-\._~/' }
+
+# n.b. this is a perfect candidate for memoization
+sub inbox_config ($$$) {
+ my ($ctx, $hdr, $txt) = @_;
+ my $ibx = $ctx->{-inbox};
+ push @$hdr, 'Content-Disposition', 'inline; filename=inbox.config';
+ my $name = dq_escape($ibx->{name});
+ my $inboxdir = '/path/to/top-level-inbox';
+ $$txt .= <<EOS;
+; example public-inbox config snippet for "$name"
+; see public-inbox-config(5) manpage for more details:
+; https://public-inbox.org/public-inbox-config.html
+[publicinbox "$name"]
+ inboxdir = $inboxdir
+ ; note: public-inbox before v1.2.0 used "mainrepo"
+ ; instead of "inboxdir", both remain supported after 1.2
+ mainrepo = $inboxdir
+ url = https://example.com/$name/
+ url = http://example.onion/$name/
+EOS
+ for my $k (qw(address listid infourl watchheader)) {
+ defined(my $v = $ibx->{$k}) or next;
+ $$txt .= "\t$k = $_\n" for @$v;
+ }
+ if (my $altid = $ibx->{altid}) {
+ my $base_url = $ibx->base_url($ctx->{env});
+ my $altid_map = $ibx->altid_map;
+ $$txt .= <<EOF;
+ ; altid DBs may be used to provide numeric article ID lookup from
+ ; old, pre-existing sources. You can recreate them via curl(1),
+ ; gzip(1), and sqlite3(1) as documented:
+EOF
+ for (sort keys %$altid_map) {
+ $$txt .= "\t;\tcurl -XPOST $base_url$_.sql.gz | \\\n" .
+ "\t;\tgzip -dc | \\\n" .
+ "\t;\tsqlite3 $inboxdir/$_.sqlite3\n";
+ $$txt .= "\taltid = serial:$_:file=$_.sqlite3\n";
+ }
+ }
+
+ for my $k (qw(filter newsgroup obfuscate replyto)) {
+ defined(my $v = $ibx->{$k}) or next;
+ $$txt .= "\t$k = $v\n";
+ }
+ $$txt .= "\tnntpmirror = $_\n" for (@{$ibx->nntp_url});
+
+ # note: this doesn't preserve cgitrc layout, since we parse cgitrc
+ # and drop the original structure
+ if (defined(my $cr = $ibx->{coderepo})) {
+ $$txt .= "\tcoderepo = $_\n" for @$cr;
+ $$txt .= <<'EOF';
+
+; `coderepo' entries allows blob reconstruction via patch emails if
+; the inbox is indexed with Xapian. `@@ <from-range> <to-range> @@'
+; line number ranges in `[PATCH]' emails link to /$INBOX_NAME/$OID/s/,
+; an HTTP endpoint which reconstructs git blobs via git-apply(1).
+EOF
+ my $pi_config = $ctx->{www}->{pi_config};
+ for my $cr_name (@$cr) {
+ my $urls = $pi_config->{"coderepo.$cr_name.cgiturl"};
+ my $path = "/path/to/$cr_name";
+ $cr_name = dq_escape($cr_name);
+
+ $$txt .= qq([coderepo "$cr_name"]\n);
+ if ($urls && scalar(@$urls)) {
+ $$txt .= "\t; ";
+ $$txt .= join(" ||\n\t;\t", map {;
+ my $cpath = $path;
+ if ($path !~ m![a-z0-9_/\.\-]!i) {
+ $cpath = dq_escape($cpath);
+ }
+ qq(git clone $_ "$cpath");
+ } @$urls);
+ $$txt .= "\n";
+ }
+ $$txt .= "\tdir = $path\n";
+ $$txt .= "\tcgiturl = https://example.com/";
+ $$txt .= uri_escape_utf8($cr_name, URI_PATH)."\n";
+ }
+ }
+ 1;
+}