package searching and installing with https://github.com/junegunn/fzf

pkgsearch.sh

#!/usr/bin/env bash

declare esc=$(printf '\033')
declare c_reset="${esc}[0m"
declare c_red="${esc}[31m"
declare c_green="${esc}[32m"
declare c_blue="${esc}[34m"

err() {
  echo -e "${c_red}$@${c_reset}" >&2
}

die() {
  [[ -n "$1" ]] && err "$1"
  exit 1
}

has() {
  command -v "$1" &> /dev/null
}

getCommandFallbacks() {
  for arg in "$@"; do arg="${arg%% *}"
    if has "$arg"; then
      echo "$arg"
      return 0
    fi
  done
  return 1
}

declare search

has -v fzf || die

fzf() {
  command fzf -e +s --multi --cycle --ansi --no-hscroll --inline-info "$@"
}

if [[ -f /etc/debian_version ]]; then
  out=$(fzf --query="$*" < <( \
      apt-cache search '' |
      sed -u -r "s|^([^ ]+)|${c_green}\1${c_reset}|" ) )
  mapfile -t pkgs < <( awk '{print $1}' <<< "$out" )
  (( ${#pkgs} > 0 )) || exit
  sudo $(getCommandFallbacks apt apt-get) install "${pkgs[@]}"
elif [[ -f /etc/arch-release ]]; then
  search='pacman'
  (( $# > 0)) && search=$(getCommandFallbacks pacaur yaourt packer apacman pacman)
  out=$(fzf < <( $search -Ss "$@" |
      awk '{
        getline descr;
        sub(/ */,"", descr);
        repo = "[" blue gensub(/\/.*/, "", 1) reset "]";
        name = green gensub(/.*\//, "", 1, $1) reset;
        info = gensub(/[^ ]* /, "", 1);
        print repo, name, info, descr;
      }' blue="$c_blue" green="$c_green" reset="$c_reset"
    )
  )
  mapfile -t pkgs < <(awk '{print $2}' <<< "$out")
  (( ${#pkgs} > 0 )) || exit
  echo "installing ${pkgs[*]}"
  ${search/pacman/sudo pacman} -S "${pkgs[@]}"
fi