helper script to copy extension files from one Chromium profile to another

copy-chromium-extensions.sh

#!/usr/bin/env bash

# one column for `select`
COLUMNS=1

main() {
    local source_profile
    local ext_id
    local dest
    local profiles=()
    local other_profiles=()

    mapfile -t profiles < <(find_profiles)
    source_profile=$(choose_source_profile "${profiles[@]}")
    echo "" >&2
    ext_id=$(choose_extension "$source_profile/Extensions")

    mapfile -t other_profiles < <(find_other_installations "$source_profile" "$ext_id" "${profiles[@]}")
    echo ""
    if [ ${#other_profiles[@]} -eq 0 ]; then
        echo "No other profiles have this extension installed."
        return 0
    fi

    dest=$(choose_dest "${other_profiles[@]}")
    echo ""
    generate_copy_commands "$source_profile" "$ext_id" "$dest"
}

find_profiles() {
    local profiles=()

    echo "Finding Chromium profiles…" >&2
    echo "" >&2
    mapfile -t profiles < <(find "$HOME/Library/Application Support/" -type d -name "Extensions" 2>/dev/null | while read -r ext_dir; do dirname "$ext_dir"; done)

    if [ ${#profiles[@]} -eq 0 ]; then
        echo "No Chromium profiles found." >&2
        return 1
    fi

    printf '%s\n' "${profiles[@]}"
}

choose_source_profile() {
    local profiles=("$@")
    local profile_display
    local display_dirs=()
    for profile in "${profiles[@]}"; do
        display_dirs+=("${profile#"$HOME/Library/Application Support/"}")
    done
    echo "Choose a profile to copy extension files from:" >&2
    select profile_display in "${display_dirs[@]}"; do
        if [ -n "$profile_display" ]; then
            echo "You selected: $profile_display" >&2
            printf '%s\n' "$HOME/Library/Application Support/$profile_display"
            return 0
        else
            echo "Invalid selection." >&2
        fi
    done
}

choose_extension() {
    local ext_dir="$1"
    local ext_records=()
    local ext_choice

    echo "Loading extensions…" >&2
    # list the extensions by ID and name (from manifest.json)
    for id_dir in "$ext_dir"/*; do
        if [ -d "$id_dir" ]; then
            local ext_id
            ext_id=$(basename "$id_dir")
            
            # Extensions usually have a version subdirectory, such as 1.0.0_0/manifest.json
            local manifest_file
            manifest_file=$(find "$id_dir" -maxdepth 2 -name "manifest.json" | head -n 1)
            
            if [ -n "$manifest_file" ] && [ -f "$manifest_file" ]; then
                # Use jq to grab the best readable name without localized placeholders
                local ext_name
                ext_name=$(jq -r '[ .browser_action.default_title, .action.default_title, .name, .homepage_url, "Unknown Name" ] | map(select(type == "string" and (startswith("__MSG_") | not))) | .[0]' "$manifest_file" 2>/dev/null)
                
                if [ -z "$ext_name" ] || [ "$ext_name" = "null" ]; then
                    ext_name="Unknown (unable to parse extension manifest)"
                fi
                
                ext_records+=("$ext_name"$'\t'"$ext_id")
            fi
        fi
    done

    # Sort extensions alphabetically by name (case-insensitive)
    mapfile -t ext_records < <(printf '%s\n' "${ext_records[@]}" | sort -f)

    local ext_names=()
    local ext_ids=()
    local ext_choices=()
    for item in "${ext_records[@]}"; do
        local ext_name="${item%$'\t'*}"
        local ext_id="${item#*$'\t'}"
        ext_names+=("$ext_name")
        ext_ids+=("$ext_id")
        ext_choices+=("$ext_name <https://chromewebstore.google.com/detail/$ext_id>")
    done

    echo "" >&2
    echo "Choose an extension to copy files from:" >&2
    select ext_choice in "${ext_choices[@]}"; do
        if [ -n "$ext_choice" ]; then
            for i in "${!ext_choices[@]}"; do
                if [[ "${ext_choices[$i]}" = "$ext_choice" ]]; then
                    echo "You selected: ${ext_names[$i]}" >&2
                    printf '%s\n' "${ext_ids[$i]}"
                    return 0
                fi
            done
        else
            echo "Invalid selection." >&2
        fi
    done
}

find_other_installations() {
    local source_profile="$1"
    local ext_id="$2"
    shift 2
    local profiles=("$@")
    local other_profiles=()
    for profile in "${profiles[@]}"; do
        local other_ext_dir="$profile/Extensions"
        if [ "$profile" != "$source_profile" ] && [ -d "$other_ext_dir/$ext_id" ]; then
            other_profiles+=("$profile")
        fi
    done

    printf '%s\n' "${other_profiles[@]}"
}

choose_dest() {
    local dest_profiles=("$@")
    local display_profiles=()
    for profile in "${dest_profiles[@]}"; do
        display_profiles+=("${profile#"$HOME/Library/Application Support/"}")
    done

    echo "The extension is also installed in the following profiles." >&2
    echo "" >&2
    echo "Choose one to copy the extension files to:" >&2
    select dest_display in "${display_profiles[@]}"; do
        if [ -n "$dest_display" ]; then
            local dest=""
            for i in "${!display_profiles[@]}"; do
                if [[ "${display_profiles[$i]}" = "$dest_display" ]]; then
                    dest="${dest_profiles[$i]}"
                    echo "You selected destination: $dest_display" >&2
                    printf '%s\n' "$dest"
                    return 0
                fi
            done
        else
            echo "Invalid selection." >&2
        fi
    done
}

generate_copy_commands() {
    local source_profile="$1"
    local ext_id="$2"
    local dest="$3"
    local source_ext_dir="$source_profile/Extensions"

    echo "Run the following commands to copy the extension:"
    echo ""
    print_copy_command "$source_ext_dir/$ext_id" "$dest/Extensions/"
    print_copy_command "$source_profile/Local Extension Settings/$ext_id" "$dest/Local Extension Settings/"
    print_copy_command "$source_profile/IndexedDB/chrome-extension_${ext_id}_0.indexeddb.leveldb" "$dest/IndexedDB/"
    print_copy_command "$source_profile/IndexedDB/chrome-extension_${ext_id}_0.indexeddb.blob" "$dest/IndexedDB/"
    print_copy_command "$source_profile/Sync Extension Settings/$ext_id" "$dest/Sync Extension Settings/"
    print_copy_command "$source_profile/Local App Settings/$ext_id" "$dest/Local App Settings/"
}

print_copy_command() {
    local source_path="$1"
    local dest_dir="$2"
    if [ -d "$source_path" ]; then
        echo "cp -R \"$source_path\" \"$dest_dir\""
    elif [ -f "$source_path" ]; then
        echo "cp \"$source_path\" \"$dest_dir\""
    fi
}

main "$@"