如何使用别名来完成bash完成？

Question

例证:

我是一个使用bash v3.2.17的mac,我正在使用通过macports安装的git和bash_completion变体.

当我输入git checkout m<tab>.例如,我把它完成了master.

但是,我有一个别名git checkout,gco.当我输入时gco m<tab>,我没有自动完成分支名称.

理想情况下,我希望自动完成只是神奇地为我的所有别名工作.可能吗？如果做不到这一点,我想为每个别名手动定制它.那么,我该怎么做呢？

Answer 1

如上面的评论所述,

complete -o default -o nospace -F _git_checkout gco

将不再有效.但是,__git_completegit-completion.bash中有一个函数可用于设置别名的完成,如下所示:

__git_complete gco _git_checkout

Answer 2

我也遇到了这个问题,并提出了这段代码.这将自动为您完成所有别名.在声明所有(或任何)别名后运行它.

# wrap_alias takes three arguments:
# $1: The name of the alias
# $2: The command used in the alias
# $3: The arguments in the alias all in one string
# Generate a wrapper completion function (completer) for an alias
# based on the command and the given arguments, if there is a
# completer for the command, and set the wrapper as the completer for
# the alias.
function wrap_alias() {
  [[ "$#" == 3 ]] || return 1

  local alias_name="$1"
  local aliased_command="$2"
  local alias_arguments="$3"
  local num_alias_arguments=$(echo "$alias_arguments" | wc -w)

  # The completion currently being used for the aliased command.
  local completion=$(complete -p $aliased_command 2> /dev/null)

  # Only a completer based on a function can be wrapped so look for -F
  # in the current completion. This check will also catch commands
  # with no completer for which $completion will be empty.
  echo $completion | grep -q -- -F || return 0

  local namespace=alias_completion::

  # Extract the name of the completion function from a string that
  # looks like: something -F function_name something
  # First strip the beginning of the string up to the function name by
  # removing "* -F " from the front.
  local completion_function=${completion##* -F }
  # Then strip " *" from the end, leaving only the function name.
  completion_function=${completion_function%% *}

  # Try to prevent an infinite loop by not wrapping a function
  # generated by this function. This can happen when the user runs
  # this twice for an alias like ls='ls --color=auto' or alias l='ls'
  # and alias ls='l foo'
  [[ "${completion_function#$namespace}" != $completion_function ]] && return 0

  local wrapper_name="${namespace}${alias_name}"

  eval "
function ${wrapper_name}() {
  let COMP_CWORD+=$num_alias_arguments
  args=( \"${alias_arguments}\" )
  COMP_WORDS=( $aliased_command \${args[@]} \${COMP_WORDS[@]:1} )
  $completion_function
  }
"

  # To create the new completion we use the old one with two
  # replacements:
  # 1) Replace the function with the wrapper.
  local new_completion=${completion/-F * /-F $wrapper_name }
  # 2) Replace the command being completed with the alias.
  new_completion="${new_completion% *} $alias_name"

  eval "$new_completion"
}

# For each defined alias, extract the necessary elements and use them
# to call wrap_alias.
eval "$(alias -p | sed -e 's/alias \([^=][^=]*\)='\''\([^ ][^ ]*\) *\(.*\)'\''/wrap_alias \1 \2 '\''\3'\'' /')"

unset wrap_alias

Answer 3

在git-completion.bash有一行:

complete -o default -o nospace -F _git git

查看该行(和_git函数),您可以将此行添加到.bash_profile:

complete -o default -o nospace -F _git_checkout gco

Answer 4

我有别名g ='git',并结合我的git别名我输入类似的东西

$ g co <branchname>

对我的特定用例更简单的修复是向git-completion添加一行.

在这一行的正下方:

__git_complete git _git

我添加了这一行来处理我的单个'g'别名:

__git_complete g _git

Answer 5

理想情况下,我希望自动完成只是神奇地为我的所有别名工作.可能吗？

是的,可以使用complete-alias项目(在Linux上).对Mac的支持是实验性的,但用户已报告成功.

Answer 6

您也可以尝试使用 Git 别名。例如，在我的~/.gitconfig文件中，我有一个如下所示的部分：

[alias]
        co = checkout

所以你可以输入git co m<TAB>，它应该扩展到git co master，这是git checkout命令。

Answer 7

此论坛页面显示了一个解决方案

将这些行放入您的.bashrc或.bash_profile:

# Author.: Ole J
# Date...: 23.03.2008
# License: Whatever

# Wraps a completion function
# make-completion-wrapper <actual completion function> <name of new func.>
#                         <command name> <list supplied arguments>
# eg.
#   alias agi='apt-get install'
#   make-completion-wrapper _apt_get _apt_get_install apt-get install
# defines a function called _apt_get_install (that's $2) that will complete
# the 'agi' alias. (complete -F _apt_get_install agi)
#
function make-completion-wrapper () {
    local function_name="$2"
    local arg_count=$(($#-3))
    local comp_function_name="$1"
    shift 2
    local function="
function $function_name {
    ((COMP_CWORD+=$arg_count))
    COMP_WORDS=( "$@" \${COMP_WORDS[@]:1} )
    "$comp_function_name"
    return 0
}"
    eval "$function"
}

# and now the commands that are specific to this SO question

alias gco='git checkout'

# we create a _git_checkout_mine function that will do the completion for "gco"
# using the completion function "_git"
make-completion-wrapper _git _git_checkout_mine git checkout

# we tell bash to actually use _git_checkout_mine to complete "gco"
complete -o bashdefault -o default -o nospace -F _git_checkout_mine gco

这个解决方案类似于balshetzer的脚本,但只有这个实际上适合我.(balshetzer的剧本在我的一些别名上有问题.)

Answer 8

另一种选择是使用~/.bash_completion文件。要创建gco别名，git checkout只需将其放在其中：

_xfunc git __git_complete gco _git_checkout

然后，~/.bashrc您只需要输入别名本身：

alias gco='git checkout'

两行。而已。

说明：

这些~/bash_completion获取来自主bash_completion脚本末尾。在gentoo中，我在中找到了主要脚本/usr/share/bash-completion/bash_completion。

该_xfunc git位负责git-completion为您寻找文件，因此您无需放入任何其他内容~/.bashrc。

接受的答案要求您.git-completion.sh从~/.bashrc我认为很and脚的文件中复制并获取它。

PS：我仍在尝试弄清楚如何不将整个git-completion脚本提供给我的bash环境。如果找到方法，请发表评论或编辑。