Compile MacDown for Apple silicon

Restores "Recent Documents" to the MacDown Dock icon in Sequoia and drops the Rosetta 2 dependency (macOS 27 will be the last to fully support it). Install Xcode and brew then run:

#!/bin/bash
set -euo pipefail

echo "Installing dependencies..."
brew install ruby@3.2

# Add Ruby and gem binaries to PATH (avoids duplicate lines in ~/.zshrc)
echo "Configuring Ruby path..."
LINE='export PATH="/opt/homebrew/opt/ruby@3.2/bin:/opt/homebrew/lib/ruby/gems/3.2.0/bin:$PATH"'
grep -Fxq "$LINE" ~/.zshrc || echo "$LINE" >> ~/.zshrc
export PATH="/opt/homebrew/opt/ruby@3.2/bin:/opt/homebrew/lib/ruby/gems/3.2.0/bin:$PATH"

# Uninstall any outdated Bundler versions
echo "Cleaning bundler..."
[ -d /opt/homebrew/lib/ruby/gems/3.2.0 ] && gem uninstall -aIx bundler || true

echo "Installing bundler and CocoaPods..."
gem install bundler cocoapods

echo "Cloning MacDown..."
git clone --recurse-submodules https://github.com/MacDownApp/macdown
cd macdown

# The next 4 commands are only necessary if you want the last official pre-release version, 0.8.0d71 (1079)
# rather than the default 0.8.0d32 (1111) version:

git checkout v0.8.0d71
git submodule update --init --recursive

# Work around broken Slovak localization file in v0.8.0d71
echo "Replacing broken Slovak localization file..."
echo '"DUMMY_KEY" = "DUMMY_VALUE";' > MacDown/Localization/sk.lproj/Localizable.strings

echo "Removing outdated Gemfile.lock..."
rm -f Gemfile.lock

echo "Installing Ruby dependencies..."
bundle install

echo "Installing CocoaPods dependencies..."
ruby -e 'require "logger"; exec "pod", *ARGV' install

echo "Building PEG Markdown parser..."
make -C Dependency/peg-markdown-highlight -j$(sysctl -n hw.ncpu)

echo "Opening Xcode..."
open MacDown.xcworkspace

cat <<EOF

Setup complete.

When Xcode opens, press Cmd+B to build; find MacDown.app via
Product > Show Build Folder in Finder > Products/Debug
EOF

Notes

Inspired and informed by Daniil-Gusev's guide.
Tested on a clean macOS 15.6 Sequoia install with Xcode 16.4.
If copied to another Mac, "'MacDown.app' is damaged and can’t be opened. You should move it to the Trash." may appear on first launch; resolve via xattr -rc /Applications/MacDown.app.
See also:
- Original build instructions
- v0.8.0-as by gnattu

❧ 2025-08-06