Home/End remap for OSX (like it should be)

fix-home-end-keys.sh

#!/bin/bash

# =============================================================================
# fix-home-end-keys.sh
#
# Fixes Home/End key behaviour on macOS so they jump to the start/end of the
# current line, rather than the top/bottom of the document (page up/down).
#
# macOS supports a system-wide key binding file that most native (Cocoa) apps
# respect. This script safely adds the required bindings to that file without
# clobbering any existing configuration.
#
# Bindings added:
#   Home          → move to start of line
#   End           → move to end of line
#   Shift+Home    → select to start of line
#   Shift+End     → select to end of line
#
# Safe to run multiple times — skips any bindings already present.
#
# Note: Electron apps (VS Code, Slack, etc.) manage their own keybindings and
# are unaffected by this file. Configure those apps separately.
#
# After running: log out and back in (or restart) for changes to take effect.
# =============================================================================

KEYBINDINGS_FILE="$HOME/Library/KeyBindings/DefaultKeyBinding.dict"

# Bindings to add (compatible with bash 3 which ships with macOS)
KEYS=(
    '"\UF729"'
    '"\UF72B"'
    '"$\UF729"'
    '"$\UF72B"'
)
VALUES=(
    "moveToBeginningOfLine:"
    "moveToEndOfLine:"
    "moveToBeginningOfLineAndModifySelection:"
    "moveToEndOfLineAndModifySelection:"
)

echo "=== fix-home-end-keys ==="
echo ""
echo "Configures Home/End keys to move to start/end of line in macOS native apps."
echo ""

# Ensure the KeyBindings directory exists
mkdir -p "$HOME/Library/KeyBindings"

# Create the bindings file if it doesn't exist yet
if [ ! -f "$KEYBINDINGS_FILE" ]; then
    echo "No existing keybindings file found — creating one."
    printf "{\n}\n" > "$KEYBINDINGS_FILE"
else
    echo "Found existing keybindings file — will merge safely."
fi

echo ""

# Add each binding only if it isn't already present
for i in "${!KEYS[@]}"; do
    KEY="${KEYS[$i]}"
    VALUE="${VALUES[$i]}"
    if grep -qF "$KEY" "$KEYBINDINGS_FILE"; then
        echo "  [skip]  $KEY already configured"
    else
        ESCAPED_KEY=$(printf '%s' "$KEY" | sed 's/\\/\\\\/g')
        sed -i '' "s/^}/    $ESCAPED_KEY = $VALUE;\\n}/" "$KEYBINDINGS_FILE"
        echo "  [added] $KEY = $VALUE;"
    fi
done

echo ""
echo "Done. Log out and back in for changes to take effect."