Add FONTC_VERSION and script to update requirements.txt

FONTC_VERSION

@@ -0,0 +1 @@
+0.0.2a9

README.md

@@ -6,4 +6,13 @@ It downloads a standalone fontc executable inside the plugin, which is removed w
 
 ![export dialog](exportDialog.png)
 
-The "Command line options" accept whatever fontc accepts. 
+The "Command line options" accept whatever fontc accepts.
+
+#### How to update the embdedded fontc
+
+1. Check the latest fontc version available at https://github.com/googlefonts/fontc/releases/latest
+1. Modify the `FONTC_VERSION` file accordingly
+1. Run `./update-requirements.sh` to update the requirements.txt file embedded inside
+   the plugin
+1. Bump _both_ `CFBundleShortVersionString` and `CFBundleVersion` in `fontcExport.glyphsFileFormat/Contents/Resources/Info.plist`, and stick to Glyphs.app's conventions whereby `CFBundleShortVersionString` looks like `MAJOR.MINOR` (e.g. `0.1`) and `CFBundleVersion` is a simple integer (e.g. `123`) for the build number.
+1. Commit the changes and push

fontcExport.glyphsFileFormat/Contents/Resources/plugin.py

@@ -170,7 +170,7 @@ def setupRecentExportPathsButton(self):
             menu.addItem_(item)
 
         item = NSMenuItem.alloc().initWithTitle_action_keyEquivalent_(
-            f"Update fontc", "updateFontc:", ""
+            f"Reinstall fontc", "reinstallFontc:", ""
         )
         item.setTarget_(self)
         menu.addItem_(item)
@@ -214,7 +214,8 @@ def setUpFontc(self):
             "--disable-pip-version-check",
             "--target",
             self.pluginResourcesDirPath(),
-            "fontc",
+            "-r",
+            os.path.join(self.pluginResourcesDirPath(), "requirements.txt"),
         ]
         run_subprocess_in_macro_window(installCommand, check=True)
 
@@ -264,7 +265,7 @@ def currentFontcVersion(self):
         # strip the 'fontc-' prefix and '.dist-info' suffix to get version string
         return os.path.basename(distInfoPath)[6:-10]
 
-    def updateFontc_(self, sender):
+    def reinstallFontc_(self, sender):
         fontcPath = self.fontcPath()
         if os.path.exists(fontcPath):
             print("Removed fontc; it will be re-downloaded on next export.")

fontcExport.glyphsFileFormat/Contents/Resources/requirements.txt

@@ -0,0 +1,8 @@
+--only-binary :all:
+
+fontc==0.0.2a9 \
+    --hash=sha256:17e303e067fe548925e2c4499a8eff012cfa0a6965194b5309aee290ca506775 \
+    --hash=sha256:2e156d8c857962b4a062986184b53e9ed03fc192495c0cc34a7e319e4aea8d27 \
+    --hash=sha256:60c1b98394f0034ebe9ab54dc75396df90c6ea20386e9df07a26496ecc038ed1 \
+    --hash=sha256:a02e34087b2be3444eb5fa8e08549ebe78f65389d91b4f8ba16646f91efb4e4e \
+    --hash=sha256:a5bf5dd9c628f45da02aa2986430de8a8931d87cb505bfd4b0131c70ecf0e26e

update-requirements.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# Download the requirements.txt file with pinned fontc version and SHA256 hashes
+# as specified in the 'VERSION' file.
+
+# Un-comment this and delete the fork's url when the upstream repo starts publishing releases
+# FONTC_REPO_URL="https://github.com/googlefonts/fontc"
+FONTC_REPO_URL="https://github.com/anthrotype/fontc"
+
+curl -LJo fontcExport.glyphsFileFormat/Contents/Resources/requirements.txt $FONTC_REPO_URL/releases/download/fontc-v$(<FONTC_VERSION)/requirements.txt