generate CLI docs from forgejo docs with a perl script

(cherry picked from commit 5d167821dc)

scripts/cli-docs.pl

@@ -0,0 +1,38 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+# Add the frontmatter and a note at the top of the file
+print <<EOM;
+---
+title: Forgejo CLI
+license: 'CC-BY-SA-4.0'
+---
+<!--
+This page should not be edited manually.
+To update this page, run the following command from the root of the docs repo:
+```
+forgejo docs | perl ./scripts/cli-docs.pl > ./docs/admin/command-line.md
+```
+-->
+
+_**Note**: this documentation is generated from the output of the Forgejo CLI command `forgejo docs`._
+
+EOM
+
+while (<>) {
+	# Replace 'Gitea' with 'Forgejo'
+	s/Gitea/Forgejo/g;
+
+	# Change bold formatting to code formatting for CLI parameters at the start of the line
+	s/^\*\*(\-\-[^*]+)\*\*(="")?/`$1`/g;
+
+	# Clean up the display of default values
+	s/\(default(s to|:) '?([^' )]+)'?\)/_(default: `$2`)_/g;
+
+	# Increase the level of all markdown headings
+	s/^#/##/;
+
+	print;
+}