From 3f2a482afd02583f906ca84611f045d86a243741 Mon Sep 17 00:00:00 2001
From: Marien Zwart <marien.zwart@gmail.com>
Date: Sun, 26 May 2024 14:42:07 +1000
Subject: [PATCH] Test with a generated init.el with all modules

...not yet with all flags, but that's the next step.

This surfaced several problems not caught by the existing "full" build,
because that did not enable dependencies conditionally enabled if a
second module is enabled.

There are a small number of dependencies only enabled if a second module
is *not* enabled, which I intend to add some manual tests for.
---
 build-helpers/full-init | 39 +++++++++++++++++++++++++++++++++++++++
 checks.nix              |  7 +++----
 default.nix             | 20 +++++++++++++++++++-
 3 files changed, 61 insertions(+), 5 deletions(-)
 create mode 100755 build-helpers/full-init

diff --git a/build-helpers/full-init b/build-helpers/full-init
new file mode 100755
index 0000000..46e85d4
--- /dev/null
+++ b/build-helpers/full-init
@@ -0,0 +1,39 @@
+#!/usr/bin/env doomscript
+;; -*- lexical-binding: t; -*-
+
+;; Copyright 2024 Google LLC
+;;
+;; Licensed under the Apache License, Version 2.0 (the "License");
+;; you may not use this file except in compliance with the License.
+;; You may obtain a copy of the License at
+;;
+;;     http://www.apache.org/licenses/LICENSE-2.0
+;;
+;; Unless required by applicable law or agreed to in writing, software
+;; distributed under the License is distributed on an "AS IS" BASIS,
+;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;; See the License for the specific language governing permissions and
+;; limitations under the License.
+
+(defcli! full-init
+    ((output-directory ("-o" dir) "Directory to write init.el into.")
+     (&flag full? ("--full")))
+  "Write init.el with all modules."
+  (with-temp-buffer
+    (insert ";;; init.el -*- no-byte-compile: t; -*-
+
+;;; Dynamically generated by nix-doom-emacs-unstraightened.
+
+(doom!
+")
+    (dolist (kp (doom-module-list 'all))
+      (let ((cat (car kp))
+            (name (cdr kp)))
+        (when name
+          (if full?
+              (error "unimplemented")
+            (insert (format " %s %s\n" cat name))))))
+    (insert ")\n")
+    (write-region nil nil (expand-file-name "init.el" output-directory))))
+
+(run! "full-init" (cdr (member "--" argv)))
diff --git a/checks.nix b/checks.nix
index fcc5044..61bd043 100644
--- a/checks.nix
+++ b/checks.nix
@@ -14,6 +14,7 @@
 
 {
   emacs29,
+  emptyDirectory,
   lib,
   linkFarm,
   runCommand,
@@ -36,6 +37,7 @@ let
   mkDoom = args: (makeDoomPackages (common // args)).doomEmacs;
   mkDoomDir = args: writeTextDir "init.el" (toInit args);
   minimalDoomDir = mkDoomDir { config = [ "default" ]; };
+  fullDoomDir = (makeDoomPackages (common // { doomDir = emptyDirectory; })).doomDirWithAllPackages;
   doomTest = name: init: doomArgs: testers.testEqualContents {
     assertion = "name = ${name}; modules = ${toPretty {} init}; args = ${toPretty {} doomArgs};";
     expected = writeText "doom-expected" "Doom functions";
@@ -64,10 +66,7 @@ in {
   minimalEmacs = (makeDoomPackages (common // {
     doomDir = minimalDoomDir;
   })).emacsWithDoom;
-  full = mkDoom {
-    full = true;
-    doomDir = minimalDoomDir;
-  };
+  full = mkDoom { doomDir = fullDoomDir; };
   example = mkDoom { doomDir = ./doomdirs/example; };
   example-without-loader = mkDoom {
     doomDir = ./doomdirs/example;
diff --git a/default.nix b/default.nix
index 0c8f523..f986c13 100644
--- a/default.nix
+++ b/default.nix
@@ -56,6 +56,24 @@ let
   inherit (lib) optionalAttrs optionalString;
   inherit (import ./fetch-overrides.nix) extraPins extraUrls;
 
+  # This doesn't belong here: it does not depend on doomDir (only on doomSource).
+  # But this is where all my doomscript execution lives.
+  # TODO: consider splitting off doomdir execution to a separate helper.
+  doomDirWithAllPackages = runCommandLocal "doom-full-init"
+    {
+      env = {
+        EMACS = lib.getExe emacs;
+        # Enable this to troubleshoot failures at this step.
+        #DEBUG = "1";
+      };
+      # We set DOOMLOCALDIR somewhere harmless below to stop Doom from trying to
+      # create it somewhere read-only.
+    } ''
+    mkdir $out
+    export DOOMLOCALDIR=$(mktemp -d)
+    ${runtimeShell} ${doomSource}/bin/doomscript ${./build-helpers/full-init} -o $out
+  '';
+
   # Step 1: determine which Emacs packages to pull in.
   #
   # Inputs: Doom, original DOOMDIR (only init.el and packages.el are used).
@@ -412,5 +430,5 @@ let
   '';
 in
 {
-  inherit doomEmacs emacsWithDoom;
+  inherit doomDirWithAllPackages doomEmacs emacsWithDoom;
 }