3 files changed, 166 insertions, 0 deletions
diff --git a/tools/emacs-pkgs/tvl/OWNERS b/tools/emacs-pkgs/tvl/OWNERS
new file mode 100644
index 000000000000..ce7e0e37ee4f
--- /dev/null
+++ b/tools/emacs-pkgs/tvl/OWNERS
@@ -0,0 +1,3 @@
+inherited: true
+owners:
+  - grfn
diff --git a/tools/emacs-pkgs/tvl/default.nix b/tools/emacs-pkgs/tvl/default.nix
new file mode 100644
index 000000000000..5dcc184bb521
--- /dev/null
+++ b/tools/emacs-pkgs/tvl/default.nix
@@ -0,0 +1,8 @@
+{ depot, ... }:
+
+depot.tools.emacs-pkgs.buildEmacsPackage {
+  pname = "tvl";
+  version = "1.0";
+  src = ./tvl.el;
+  externalRequires = (epkgs: with epkgs; [ magit s ]);
+}
diff --git a/tools/emacs-pkgs/tvl/tvl.el b/tools/emacs-pkgs/tvl/tvl.el
new file mode 100644
index 000000000000..3938628edc8e
--- /dev/null
+++ b/tools/emacs-pkgs/tvl/tvl.el
@@ -0,0 +1,155 @@
+;;; tvl.el --- description -*- lexical-binding: t; -*-
+;;
+;; Copyright (C) 2020 Griffin Smith
+;; Copyright (C) 2020 The TVL Contributors
+;;
+;; Author: Griffin Smith <grfn@gws.fyi>
+;; Version: 0.0.1
+;; Package-Requires: (s dash magit)
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; Commentary:
+;;
+;; This file provides shared utilities for interacting with the TVL monorepo
+;;
+;;; Code:
+
+(require 'magit)
+(require 's)
+
+(defgroup tvl nil
+  "Customisation options for TVL functionality.")
+
+(defcustom tvl-gerrit-remote "origin"
+  "Name of the git remote for gerrit"
+  :type '(string)
+  :group 'tvl)
+
+(defcustom tvl-depot-path "/depot"
+  "Location at which the TVL depot is checked out."
+  :type '(string)
+  :group 'tvl)
+
+(defcustom tvl-target-branch "canon"
+  "Branch to use to target CLs"
+  :group 'tvl
+  :type '(string)
+  :safe (lambda (_) t))
+
+(defun tvl--gerrit-ref (target-branch &optional flags)
+  (let ((flag-suffix (if flags (format "%%l=%s" (s-join "," flags))
+                       "")))
+    (format "HEAD:refs/for/%s%s" target-branch flag-suffix)))
+
+(transient-define-suffix magit-gerrit-push-for-review ()
+  "Push to Gerrit for review."
+  (interactive)
+  (magit-push-refspecs tvl-gerrit-remote
+                       (tvl--gerrit-ref tvl-target-branch)
+                       nil))
+
+(transient-append-suffix
+  #'magit-push ["r"]
+  (list "R" "push to Gerrit for review" #'magit-gerrit-push-for-review))
+
+(transient-define-suffix magit-gerrit-push-wip ()
+  "Push to Gerrit as a work-in-progress."
+  (interactive)
+  (magit-push-refspecs tvl-gerrit-remote
+                       (concat (tvl--gerrit-ref tvl-target-branch) "%wip")
+                       nil))
+
+(transient-append-suffix
+  #'magit-push ["r"]
+  (list "W" "push to Gerrit as a work-in-progress" #'magit-gerrit-push-wip))
+
+(transient-define-suffix magit-gerrit-submit ()
+  "Push to Gerrit for review."
+  (interactive)
+  (magit-push-refspecs tvl-gerrit-remote
+                       (tvl--gerrit-ref tvl-target-branch '("submit"))
+                       nil))
+
+(transient-append-suffix
+  #'magit-push ["r"]
+  (list "S" "push to Gerrit to submit" #'magit-gerrit-submit))
+
+
+(transient-define-suffix magit-gerrit-rubberstamp ()
+  "Push, automatically approve and submit to Gerrit. This
+rubberstamp operation is dangerous and should only be used in
+`//users'."
+  (interactive)
+  (magit-push-refspecs tvl-gerrit-remote
+                       (tvl--gerrit-ref tvl-target-branch
+                                        '("Code-Review+2" "publish-comments"))
+                       nil))
+
+(transient-append-suffix
+  #'magit-push ["r"]
+  (list "P" "push & rubberstamp to Gerrit" #'magit-gerrit-rubberstamp))
+
+(defvar magit-cl-history nil)
+(defun magit-read-cl (remote)
+  (let* ((refs (prog2 (message "Determining available refs...")
+                   (magit-remote-list-refs remote)
+                 (message "Determining available refs...done")))
+         (change-refs (-filter
+                       (apply-partially #'string-prefix-p "refs/changes/")
+                       refs))
+         (cl-number-to-refs
+          (-group-by
+           (lambda (change-ref)
+             ;; refs/changes/34/1234/1
+             ;; ^    ^       ^  ^    ^
+             ;; 1    2       3  4    5
+             ;;                 ^-- this one
+             (cadddr
+              (split-string change-ref (rx "/"))))
+           change-refs))
+         (cl-numbers
+          (-map
+           (lambda (cl-to-refs)
+             (let ((latest-patchset-ref
+                    (-max-by
+                     (-on #'> (lambda (ref)
+                                (string-to-number
+                                 (fifth (split-string ref (rx "/"))))))
+                     (-remove
+                      (apply-partially #'s-ends-with-p "meta")
+                      (cdr cl-to-refs)))))
+               (propertize (car cl-to-refs) 'ref latest-patchset-ref)))
+           cl-number-to-refs)))
+    (get-text-property
+     0
+     'ref
+     (magit-completing-read
+      "Checkout CL" cl-numbers nil t nil 'magit-cl-history))))
+
+(transient-define-suffix magit-gerrit-checkout (remote cl-refspec)
+  "Prompt for a CL number and checkout the latest patchset of that CL with
+  detached HEAD"
+  (interactive
+   (let* ((remote tvl-gerrit-remote)
+          (cl (magit-read-cl remote)))
+     (list remote cl)))
+  (magit-fetch-refspec remote cl-refspec (magit-fetch-arguments))
+  ;; That runs async, so wait for it to finish (this is how magit does it)
+  (while (and magit-this-process
+              (eq (process-status magit-this-process) 'run))
+    (sleep-for 0.005))
+  (magit-checkout "FETCH_HEAD" (magit-branch-arguments))
+  (message "HEAD detached at %s" cl-refspec))
+
+(transient-append-suffix
+  #'magit-branch ["l"]
+  (list "g" "gerrit CL" #'magit-gerrit-checkout))
+
+(defun tvl-depot-status ()
+  "Open the TVL monorepo in magit."
+  (interactive)
+  (magit-status-setup-buffer tvl-depot-path))
+
+(provide 'tvl)
+;;; tvl.el ends here