#!/bin/bash

# contains functions used by more than one script

# find_pkgbuild repository package
# find the PKGBUILD of $package from $repository

find_pkgbuild() {

  local PKGBUILD='' repo file

  if [ -f "${repo_paths["archlinux32"]}/$2/$1/PKGBUILD" ]; then
    # If this package has some modification,
    repo="$(find_git_repository_to_package_repository "$2")"
    if ! [ -d "${repo_paths["${repo}"]}/$1" ]; then
      # create some dummy files if it is also new.
      mkdir -p "${repo_paths["${repo}"]}/$1/repos/$2-x86_64"
      touch "${repo_paths["${repo}"]}/$1/repos/$2-x86_64/PKGBUILD"
    fi
  fi

  for repo in "${!repo_paths[@]}"; do
    if [ "${repo}" == "archlinux32" ]; then
      # this is not a repository of packages
      continue
    fi
    if ! [ -d "${repo_paths["${repo}"]}/$1" ]; then
      continue
    fi
    PKGBUILD="$(
      ls "${repo_paths["${repo}"]}/$1/repos/$2-"*"/PKGBUILD" 2> /dev/null | \
        tr ' ' '\n' | \
        grep -v -- '-i686/PKGBUILD$' | \
        grep -v -- '-\(staging\|testing\)-[^/]\+/PKGBUILD$' | \
        sort | \
        tail -n1
    )"
    if [ -n "${PKGBUILD}" ]; then
      echo "${PKGBUILD}"
      break
    fi
  done
}

# apply customizations to a package
#  (to be executed in the package's directory)

# TODO:
#  mangle $arch in PKBUILDs to contain i486, i586, i686

apply_package_customizations() {
  if [ ! -f 'PKGBUILD' ]; then
    >&2 echo 'PKGBUILD not found.'
    pwd
    exit 1
  fi

  if [ ! -f 'PKGBUILD.changes-applied' ]; then
    # add i686 to the arch list
    sed '/^arch=[^#]*any/!s|^\(arch=(\)\([^#]*)\)\s*\(#.*\)\?$|\1'"'i686'"' \2|' -i 'PKGBUILD'
    if [ -f "${repo_paths["archlinux32"]}/$2/$1/PKGBUILD" ]; then
      # If this package has modifications (or is new), apply them now:
      # append PKGBUILD
      cat "${repo_paths["archlinux32"]}/$2/$1/PKGBUILD" >> \
        'PKGBUILD'
      # copy (and overwrite) other files
      for file in "${repo_paths["archlinux32"]}/$2/$1/"*; do
        if [ -f "${file}" ] && [ "${file##*/}" != 'PKGBUILD' ]; then
          cp "${file}" ./
        fi
      done
    fi
    touch 'PKGBUILD.changes-applied'
  fi
}

# find_repository_with_commit commit
# find the repository which has $commit

find_repository_with_commit() {

  local repository

  for repository in "${!repo_paths[@]}"; do
    if [ "$(git -C "${repo_paths["${repository}"]}" cat-file -t "$1" 2> /dev/null)" == "commit" ]; then
      echo "${repository}"
      return 0
    fi
  done
  >&2 echo "can't find repository with commit '$1'"
  exit 1

}

# find_git_repository_to_package_repository repository
# find the git repository which tracks the package repository $repository

find_git_repository_to_package_repository() {

  local repository

  for repository in "${!repo_paths[@]}"; do
    if [ "${repository}" == "archlinux32" ]; then
      continue
    fi
    if [ -n "$(
      (
        ls "${repo_paths["${repository}"]}/"*"/repos" | \
          grep -v ':$' | \
          sed 's|-[^-]\+$||' | \
          sort -u
        echo "$1"
      ) | \
        sort | \
        uniq -d
      )" ]; then
      echo "${repository}"
      return 0
    fi
  done
  >&2 echo "can't find git repository with package repository '$1'"
  exit 1

}