vita in binario

Link: http://www.archlinux.fr/yaourt-en/

yaourt è un tool che ho iniziato ad usare da poco ma che si è rivelato molto utile in questo periodo, e ancora non ho finito di scoprire tutte le sue caratteristiche. yaourt è un wrapper di pacman, aggiunge alcune funzionalità come il supporto per AUR, la colorazione dell'output, la gestione dei file di configurazione e avverte l'utente quando vengono trovati dei nuovi pacchetti orfani. (tratto da linuxpedia)

Fino a poco fa mancava una sola cosa a questo tool: il supporto bash_completion, con questo strumento i comandi vengono completati con [TAB] in base al contesto in cui vengono digitati, per esempio:
digitando yaourt -S e[TAB][TAB] vengono mostrati a video solo i pacchetti che sarebbe possibile installare con pacman -S, cioè i pacchetti contenuti nei repo sincronizzati attraverso pacman

Nel proseguo dell'articolo presento il file da aggiungere in /etc/bash_completion.d per avere il supporto a yaourt

Follow up:

# vim: set ft=sh ts=2 sw=2 et:
# file: /etc/bash_completion.d/yaourt

# Bash completion for yaourt
# Original: Igor Scabini <furester at gmail.com>
# adapted from bash_completion by Manolis Tzanidakis <mtzanidakis@freemail.gr>
#
# Distributed under the terms of the GNU General Public License, v2 or later.
#

## initial functions

rem_selected ()
{
  # (Adapted from bash_completion by Ian Macdonald <ian@caliban.org>)
  # This removes any options from the list of completions that have
  # already been specified on the command line.
  COMPREPLY=($(echo "${COMP_WORDS[@]}" | \
    (while read -d ' ' i; do
      [ "${i}" == "" ] && continue
      # flatten array with spaces on either side,
      # otherwise we cannot grep on word boundaries of
      # first and last word
      COMPREPLY=" ${COMPREPLY[@]} "
      # remove word from list of completions
      COMPREPLY=(${COMPREPLY/ ${i%% *} / })
    done
    echo ${COMPREPLY[@]})))
  return 0
}

_available_repos ()
{
  COMPREPLY=( $( compgen -W "$(grep '\[' /etc/pacman.conf | grep -v -e 'options' -e '^#' | tr -d '[]' )" -- $cur ) )
}

_installed_pkgs ()
{
  local installed_pkgs
  installed_pkgs=$( ls /var/lib/pacman/local/ )
  COMPREPLY=( $( compgen -W "$( for i in $installed_pkgs; do echo ${i%-*-*}; done )" -- $cur ) )
}

_available_pkgs ()
{
  #find balks easilly on a find /foo/*/* type dir, especially one like
  #   /var/lib/pacman/*/*
  # This little change-up removes the find *and* only uses enabled repos
  local available_pkgs
  local enabled_repos
  enabled_repos=$( grep '\[' /etc/pacman.conf | grep -v -e 'options' -e '^#' | tr -d '[]' )
  available_pkgs=$( for r in $enabled_repos; do echo /var/lib/pacman/sync/$r/*; done )
  COMPREPLY=( $( compgen -W "$( for i in $available_pkgs; do j=${i##*/}; echo ${j%-*-*}; done )" -- $cur ) )
}

_installed_groups ()
{
  local installed_groups
  installed_groups=$( find /var/lib/pacman/local -name desc -exec sed -ne '/%GROUPS%/,/^$/{//d; p}' {} \; | sort -u )
  COMPREPLY=( $( compgen -W "$( for i in $installed_groups; do echo ${i%-*-*}; done )" -- $cur ) )
}

_available_groups ()
{
  #find balks easilly on a find /foo/*/* type dir, especially one like
  #   /var/lib/pacman/*/*
  # This little change-up removes the find *and* only uses enabled repos
  local available_groups
  local enabled_repos
  enabled_repos=$( grep '\[' /etc/pacman.conf | grep -v -e 'options' -e '^#' | tr -d '[]' )
  available_groups=$( for r in $enabled_repos; do sed '/%GROUPS%/,/^$/{//d; p}' /var/lib/pacman/sync/$r/*/desc | sort -u; done )
  COMPREPLY=( $( compgen -W "$( for i in $available_groups; do echo ${i%-*-*}; done )" -- $cur ) )
}

## makepkg completion

_makepkg ()
{
  local cur prev
  COMPREPLY=()
  cur=${COMP_WORDS[COMP_CWORD]}
  prev=${COMP_WORDS[COMP_CWORD-1]}



  case "$prev" in
    -p)
      _filedir
      return 0
    ;;
    --help|--cleancache)
      COMPREPLY=''
      return 0
    ;;
  esac

  if [[ "$cur" == -* ]]; then
    COMPREPLY=( $( compgen -W '\
      -A --ignorearch \
      -b --builddeps \
      -c --clean \
      -C --cleancache \
      -d --nodeps \
      -e --noextract \
      -f --force \
      -g --geninteg \
      -h --help \
      -i --install \
      -L --log \
      -m --nocolor \
      -o --nobuild \
      -p \
      -r --rmdeps \
      -s --syncdeps \
      --asroot \
      --source \
      --noconfirm \
      --noprogressbar' -- $cur ) )
  fi

  rem_selected
}
complete -o default -F _makepkg makepkg

## yaourt completion

_instring ()
{
  str="${1}"
  shift 1
  for c in "${@}"; do
    if [ $(expr index "${str}" "${c}") -gt 0 ]; then
      return 0
    fi
  done
  return 1
}

_yaourt ()
{
  local a arg toparse op mod cur
  COMPREPLY=()

  # This argument parsing is done so we can check for flag existance later
  #  right now it's a tad crappy, but does the job
  for (( i=1; i < ${#COMP_WORDS[@]}-1; i++ )); do
    a=${COMP_WORDS[i]}
    arg="${a:0:2}"
    toparse="${a:2}"

    case "${arg}" in
      -@(A|U|R|S|Q|h|V))
        op="${arg/-}"
        mod="${mod}${a:2}"
        ;;
      --)
        arg="${a:2}"
        case "${arg}" in
          add) op="A" ;;
          remove) op="R" ;;
          upgrade) op="U" ;;
          query) op="Q" ;;
          sync) op="S" ;;
          help) op="h" ;;
          version) op="V" ;;
          verbose) mod="${mod}v" ;;
          root) mod="${mod}r" ;;
          dbpath) mod="${mod}b" ;;
          nodeps) mod="${mod}d" ;;
          force) mod="${mod}f" ;;
          groups) mod="${mod}g" ;;
          info) mod="${mod}i" ;;
          list) mod="${mod}l" ;;
          print-uris) mod="${mod}p" ;;
          search) mod="${mod}s" ;;
          sysupgrade) mod="${mod}u" ;;
          upgrades) mod="${mod}u" ;;
          downloadonly) mod="${mod}w" ;;
          refresh) mod="${mod}y" ;;
          changelog) mod="${mod}c" ;;
          deps) mod="${mod}d" ;;
          explicit) mod="${mod}e" ;;
          unrequired) mod="${mod}t" ;;
          foreign) mod="${mod}m" ;;
          owns) mod="${mod}o" ;;
          file) mod="${mod}p" ;;
          search) mod="${mod}s" ;;
          upgrades) mod="${mod}u" ;;
          cascade) mod="${mod}c" ;;
          dbonly) mod="${mod}k" ;;
          nosave) mod="${mod}n" ;;
          recursive) mod="${mod}s" ;;
        esac ;;
      *) toparse="${a}" ;;
    esac

    arglen=$(( ${#toparse}-1 ))
    for c in $(seq 0 "${arglen}"); do
      arg=${toparse:$c:1}
      [ "${arg}" != "-" ] && mod="${mod}${arg}"
    done
  done

  cur=${COMP_WORDS[COMP_CWORD]}

  if [ $COMP_CWORD -eq 1 ] && [[ "$cur" == -* ]]; then
    COMPREPLY=( $( compgen -W '\
      -A --add \
      -h --help \
      -Q --query \
      -R --remove \
      -S --sync \
      -U --upgrade \
      -V --version \
      ' -- $cur ) )
    rem_selected
    return 0
  fi

  if [[ "$cur" == -* ]]; then
    case "${op}" in
      A|U)
        COMPREPLY=( $( compgen -W '\
          --asdeps \
          -d --nodeps \
          -f --force \
          -h --help \
          --config \
          --logfile \
          --noconfirm \
          --noprogressbar \
          --noscriptlet \
          -v --verbose \
          -r --root \
          -b --dbpath \
          --cachedir \
          ' -- $cur ) )
        return 0
        ;;
      R)
        COMPREPLY=( $( compgen -W '\
          -c --cascade \
          -d --nodeps \
          -h --help \
          -k --dbonly \
          -n --nosave \
          -s --recursive \
          --config \
          --logfile \
          --noconfirm \
          --noprogressbar \
          --noscriptlet \
          -v --verbose \
          -r --root \
          -b --dbpath \
          --cachedir \
          ' -- $cur ) )
        return 0
        ;;
      S)
        COMPREPLY=( $( compgen -W '\
          --asdeps \
          -c --clean \
          -d --nodeps \
          -e --dependsonly \
          -f --force \
          -g --groups \
          -h --help \
          -i --info \
          -l --list \
          -p --print-uris \
          -s --search \
          -u --sysupgrade \
          -w --downloadonly \
          -y --refresh \
          --needed \
          --ignore \
          --ignoregroup \
          --config \
          --logfile \
          --noconfirm \
          --noprogressbar \
          --noscriptlet \
          -v --verbose \
          -r --root \
          -b --dbpath \
          --cachedir \
          ' -- $cur ) )
        return 0
        ;;
      Q)
        COMPREPLY=( $( compgen -W '\
          -c --changelog \
          -d --deps \
          -e --explicit \
          -g --groups \
          -h --help \
          -i --info \
          -l --list \
          -m --foreign \
          -o --owns \
          -p --file \
          -s --search \
          -t --unrequired \
          -u --upgrades \
          --config \
          --logfile \
          --noconfirm \
          --noprogressbar \
          --noscriptlet \
          -v --verbose \
          -r --root \
          -b --dbpath \
          --cachedir \
          ' -- $cur ) )
        return 0
        ;;
    esac
    rem_selected
  else
    case "${op}" in
      A|U)
        COMPREPLY=( $( compgen -d -- "$cur" ) \
                    $( compgen -f -X '!*.pkg.tar.gz' -- "$cur" ) )
        return 0
        ;;
      h|V)
        COMPREPLY=''
        return 0
        ;;
      Q)
        if _instring $mod g; then
          _installed_groups
        elif _instring $mod o; then
          COMPREPLY=( $( compgen -d -- "$cur" ) \
                      $( compgen -f -- "$cur" ) )
        elif _instring $mod p; then
          COMPREPLY=( $( compgen -d -- "$cur" ) \
                      $( compgen -f -X '!*.pkg.tar.gz' -- "$cur" ) )
        elif _instring $mod u; then
          COMPREPLY=''
          return 0
        else
          _installed_pkgs
        fi
        return 0
        ;;
      R)
        _installed_pkgs
        return 0
        ;;
      S)
        if _instring $mod l; then
          _available_repos
        else
          _available_pkgs
        fi
        return 0
        ;;
    esac
  fi

  rem_selected
}
complete -o filenames -F _yaourt yaourt

Copiate il testo qui sopra in un file chiamato yaourt e mettetelo nella cartella /etc/bash_completion.d/
# cp yaourt /etc/bash_completion.d/
quindi per far sapere a bash_completion di questa modifica date un bel
source /etc/profile

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