#!/bin/bash
#
# Purpose : Paths, settings and helpers shared by coredesktop-dev's scripts

# The deployed copy: the machine's running CoreDesktop, which update pulls
COREDESKTOP="$HOME/.local/share/coredesktop"

CONFIG_DIR="$HOME/.config/coredesktop-dev"
CONFIG="$CONFIG_DIR/config"

# First line after the shebang of the pre-push hook this project installs, so it
# never overwrites or removes a hook someone else wrote
HOOK_MARKER="# Installed by coredesktop-dev; remove with: coredesktop-dev hooks remove"

die() {
  echo "$*" >&2
  exit 1
}

confirm() {
  local answer
  read -rp "$1 [y/N] " answer
  [[ "$answer" == [yY]* ]]
}

# Sets WORKING_COPY from the settings file (empty if there is none)
load_config() {
  WORKING_COPY=""
  # shellcheck source=/dev/null
  [ -f "$CONFIG" ] && source "$CONFIG"
  return 0
}

save_config() {
  mkdir -p "$CONFIG_DIR"
  printf 'WORKING_COPY=%q\n' "$1" > "$CONFIG"
}

# True if DIR is the deployed copy, however it's spelled
is_deployed_copy() {
  [ -e "$1" ] && [ "$(realpath "$1")" = "$(realpath "$COREDESKTOP" 2> /dev/null)" ]
}

# True if DIR is the top of a git clone of CoreDesktop
is_coredesktop_clone() {
  [ -d "$1" ] \
    && [ "$(git -C "$1" rev-parse --show-toplevel 2> /dev/null)" = "$(realpath "$1")" ] \
    && [ -f "$1/update" ] && [ -d "$1/updates.d" ]
}

# Load the settings and stop unless they point at a CoreDesktop clone
require_working_copy() {
  load_config
  [ -n "$WORKING_COPY" ] \
    || die "No working copy is set. Run $(sibling_dir)/install.sh, or: sibling add <coredesktop-dev url>"
  is_coredesktop_clone "$WORKING_COPY" \
    || die "The working copy, $WORKING_COPY, isn't a clone of CoreDesktop (set in $CONFIG)."
}

in_flatpak() {
  [ -f /.flatpak-info ] || [ -n "${FLATPAK_ID:-}" ]
}

# This project's folder
sibling_dir() {
  cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd
}