README: Add releases.

* README.org (Download): Add releases.
* build-aux/build-home-page.el (org-dblock-write:releases): New
function.
(build-website): Update dynamic blocks before exporting.

2 files changed, 21 insertions, 0 deletions

diff --git a/README.org b/README.org
index 1954a1c..0c64228 100644
--- a/README.org
+++ b/README.org
@@ -10,6 +10,13 @@ HTTP handler to implement a HTTP GraphQL endpoint.
 
 * Download
 
+Download release tarballs.
+
+#+BEGIN: releases
+#+END:
+
+Download [[https://systemreboot.net/files/misc/arunisaac.pub][public signing key]].
+
 Browse the [[https://git.systemreboot.net/kolam][development version]] of kolam hosted in a git repository.
 
 * Portability
diff --git a/build-aux/build-home-page.el b/build-aux/build-home-page.el
index ac55bf9..e005756 100644
--- a/build-aux/build-home-page.el
+++ b/build-aux/build-home-page.el
@@ -35,6 +35,20 @@
       org-html-head-include-scripts nil
       org-html-postamble nil)
 
+(defun org-dblock-write:releases (params)
+  "Dynamically write releases block."
+  (call-process "git" nil t nil
+                "for-each-ref" "--sort=-taggerdate"
+                (let ((release-file "./releases/kolam-%(refname:short).tar.lz"))
+                  (format "--format=- %%(taggerdate:short) [[%s][%s]] [[%s.asc][GPG Signature]]"
+                          release-file
+                          (file-name-nondirectory release-file)
+                          release-file))
+                "refs/tags/v*")
+  ;; Fix tarball filenames.
+  (replace-string "kolam-v" "kolam-" nil nil nil t))
+
 (defun build-website ()
   (with-current-buffer (find-file "README.org")
+    (org-update-all-dblocks)
     (org-export-to-file 'html "website/index.html")))