From a8c09f2584b1642623717a6cd58be63ece30fee5 Mon Sep 17 00:00:00 2001
From: Nick Coutsos <nick@coutsos.com>
Date: Mon, 20 Dec 2021 18:00:45 -0500
Subject: Experimental support for .keymap template

---
 README.md                    | 27 ++++++++++++++++-----------
 api/services/github/files.js | 17 ++++++++++++++++-
 2 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/README.md b/README.md
index b5fde3d..0a2c3c8 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # Keymap Editor
 
-A browser app (plus NodeJS server) to edit QMK and ZMK keymaps. This was hastily
-thrown together and then even more hastily converted to a Vue app with support
-for ZMK tossed in.
+A browser app (plus NodeJS server) to edit ZMK keymaps. This is still in its
+infancy and doesn't yet support parsing existing ZMK keymaps which limits some
+kinds of functionality (mainly those involving custom/configured behaviours).
 
 ![Screenshot](editor-screenshot.png)
 
@@ -68,14 +68,19 @@ I know that QMK moves quickly and now  supports a lot of configuration in
 I haven't defined, and would benefit from a schema definition agreed on by the
 dev team.
 
-In a previous version I had started working on supporting combos but gave up
-because I couldn't be bothered to experiment with `TAPPING_TERM` settings that
-felt comfortable.
+Some ZMK behaviours can be configured and some nodes of the device tree can be
+aliased, but I don't understand it well enough to make these first-class
+editable resources in this tool. As a short term solution I've added simplistic
+"templating" of an existing keymap file. If your repository includes a file
+called `config/*.keymap.template` the editor will replace the following tags
+with the appropriate generated code
 
-More recently I've ripped out QMK-related code. Some interfaces haven't been
-updated, so there's still some vestigial support for both. It's less important
-to make this a 100% fit for the ZMK codebase and more important to provide a
-proof of concept for how apps can be built to support users of the firmware.
+* `{{behaviour_includes}}`
+* `{{rendered_layers}}`
+
+Note that "simplistic" means "find-and-replace" and doesn't support templating
+other content of each layer section. So you may be able to define encoders in
+your keymap template but you can't make per-layer bindings for them.
 
 ### What else?
 
@@ -95,4 +100,4 @@ The collection of ZMK keycodes is taken from the ZMK documentation under the MIT
 license as well.
 
 [keymap-editor]: https://nickcoutsos.github.io/keymap-editor/
-[zmk-config-corne-demo]: https://github.com/nickcoutsos/zmk-config-corne-demo
\ No newline at end of file
+[zmk-config-corne-demo]: https://github.com/nickcoutsos/zmk-config-corne-demo
diff --git a/api/services/github/files.js b/api/services/github/files.js
index 9c2b6f9..41cc91d 100644
--- a/api/services/github/files.js
+++ b/api/services/github/files.js
@@ -73,9 +73,24 @@ async function findCodeKeymap (installationToken, repository, branch) {
   return originalCodeKeymap
 }
 
+async function findCodeKeymapTemplate (installationToken, repository, branch) {
+  // Assume that the relevant files are under `config/` and not a complicated
+  // directory structure, and that there are fewer than 1000 files in this path
+  // (a limitation of GitHub's repo contents API).
+  const { data: directory } = await fetchFile(installationToken, repository, 'config', { branch })
+  const template = directory.find(file => file.name.toLowerCase().endsWith('.keymap.template'))
+
+  if (template) {
+    const { data: content } = await fetchFile(installationToken, repository, template.path, { branch, raw: true })
+    return content
+  }
+}
+
 async function commitChanges (installationId, repository, branch, layout, keymap) {
   const { data: { token: installationToken } } = await auth.createInstallationToken(installationId)
-  const generatedKeymap = zmk.generateKeymap(layout, keymap)
+  const template = await findCodeKeymapTemplate(installationToken, repository, branch)
+
+  const generatedKeymap = zmk.generateKeymap(layout, keymap, template)
 
   const originalCodeKeymap = await findCodeKeymap(installationToken, repository, branch)
   const { data: {sha, commit} } = await api.request({ url: `/repos/${repository}/commits/${branch}`, token: installationToken })
-- 
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