Preview generator: generating a preview by layer number

Makefile

@@ -1,3 +1,6 @@
+# Flashing the keyboard:
+# make flash
+
 qmk_dir = qmk_firmware
 
 keyboard = handwired/dactyl_manuform/5x6
@@ -22,14 +25,20 @@ flash:
 	@make qmk_flash
 	@make keymap_clean
 
+# Creating layer previews:
+# make preview[_copy] [layer=number]
+
+layer = -1
 preview_cmd = node \
 	./preview_generator/preview_generator.js \
-	"${PWD}/keymap/keymap.c"
+	"${PWD}/keymap/keymap.c" \
+	"$(layer)"
 
 preview:
 	@${preview_cmd}
 
-preview_and_copy:
+preview_copy:
 	@${preview_cmd} | xclip -sel clipboard
-	@echo 'Copied to the clipboard! Paste it in the "Raw data" tab:'
+	@echo 'The layout has been copied to the clipboard!'
+	@echo 'Paste it into the "Raw Data" tab here:'
 	@echo 'http://www.keyboard-layout-editor.com/'

preview_generator/parts/rows.js

@@ -1,4 +1,5 @@
 const HALVES_GAP = 5
+const NUMBER_OF_ROWS = 8
 
 const row = (keys, start, gapOffset) => [
   {x: start},
@@ -15,13 +16,22 @@ const row4 = (keys, rowIndex) => ({
   5: row(keys, 4, 0),
   6: row(keys, 6, -4),
   7: row(keys, 6, -4),
-}[rowIndex % 8])
+}[rowIndex % NUMBER_OF_ROWS])
 
 const buildRow = (keys, rowIndex) => ({
   12: row12(keys),
   4: row4(keys, rowIndex)
 }[keys.length] || ['Oh no...'])
 
+const layerRange = layerIndex =>
+  layerIndex === -1
+    ? []
+    : Array(2)
+      .fill(layerIndex)
+      .map((x, i) => x + i)
+      .map(x => x * NUMBER_OF_ROWS)
+
 module.exports = {
+  layerRange,
   buildRow
 }

preview_generator/preview_generator.js

@@ -5,26 +5,28 @@
 
 const fs = require('fs')
 
-const {buildRow} = require('./parts/rows')
+const {buildRow, layerRange} = require('./parts/rows')
 const {cleanKeys, printLegends} = require('./parts/keys')
 
-const keymapToKLERawData = fileContent =>
+const keymapToKLERawData = (fileContent, layerIndex) =>
   fileContent
     .split('\n')
     .map(row => row.split(','))
     .filter(keys => keys.length > 1)
+    .slice(...layerRange(layerIndex))
     .map(cleanKeys)
     .map(printLegends)
     .map(buildRow)
     .map(JSON.stringify)
-    // .slice(0, 8)
-    // .slice(8, 16)
-    // .slice(16)
     .join(',\n')
 
+/* */
+
 const keymapFilePath = process.argv[2]
+const layerIndex = Number(process.argv[3])
+
 const fileContent = fs.readFileSync(keymapFilePath, 'utf8')
-const rawData = keymapToKLERawData(fileContent)
+const rawData = keymapToKLERawData(fileContent, layerIndex)
 
 console.log(rawData)