如何获取bash对别名执行制表符补全？

以下代码根据该Stack Overflow答案和Ubuntu论坛讨论线程改编而成，将为您定义的所有别名添加补全：

# Automatically add completion for all aliases to commands having completion functions
function alias_completion {
    local namespace="alias_completion"

    # parse function based completion definitions, where capture group 2 => function and 3 => trigger
    local compl_regex='complete( +[^ ]+)* -F ([^ ]+) ("[^"]+"|[^ ]+)'
    # parse alias definitions, where capture group 1 => trigger, 2 => command, 3 => command arguments
    local alias_regex="alias ([^=]+)='(\"[^\"]+\"|[^ ]+)(( +[^ ]+)*)'"

    # create array of function completion triggers, keeping multi-word triggers together
    eval "local completions=($(complete -p | sed -Ene "/$compl_regex/s//'\3'/p"))"
    (( ${#completions[@]} == 0 )) && return 0

    # create temporary file for wrapper functions and completions
    rm -f "/tmp/${namespace}-*.tmp" # preliminary cleanup
    local tmp_file; tmp_file="$(mktemp "/tmp/${namespace}-${RANDOM}XXX.tmp")" || return 1

    local completion_loader; completion_loader="$(complete -p -D 2>/dev/null | sed -Ene 's/.* -F ([^ ]*).*/\1/p')"

    # read in "<alias> '<aliased command>' '<command args>'" lines from defined aliases
    local line; while read line; do
        eval "local alias_tokens; alias_tokens=($line)" 2>/dev/null || continue # some alias arg patterns cause an eval parse error
        local alias_name="${alias_tokens[0]}" alias_cmd="${alias_tokens[1]}" alias_args="${alias_tokens[2]# }"

        # skip aliases to pipes, boolean control structures and other command lists
        # (leveraging that eval errs out if $alias_args contains unquoted shell metacharacters)
        eval "local alias_arg_words; alias_arg_words=($alias_args)" 2>/dev/null || continue
        # avoid expanding wildcards
        read -a alias_arg_words <<< "$alias_args"

        # skip alias if there is no completion function triggered by the aliased command
        if [[ ! " ${completions[*]} " =~ " $alias_cmd " ]]; then
            if [[ -n "$completion_loader" ]]; then
                # force loading of completions for the aliased command
                eval "$completion_loader $alias_cmd"
                # 124 means completion loader was successful
                [[ $? -eq 124 ]] || continue
                completions+=($alias_cmd)
            else
                continue
            fi
        fi
        local new_completion="$(complete -p "$alias_cmd")"

        # create a wrapper inserting the alias arguments if any
        if [[ -n $alias_args ]]; then
            local compl_func="${new_completion/#* -F /}"; compl_func="${compl_func%% *}"
            # avoid recursive call loops by ignoring our own functions
            if [[ "${compl_func#_$namespace::}" == $compl_func ]]; then
                local compl_wrapper="_${namespace}::${alias_name}"
                    echo "function $compl_wrapper {
                        (( COMP_CWORD += ${#alias_arg_words[@]} ))
                        COMP_WORDS=($alias_cmd $alias_args \${COMP_WORDS[@]:1})
                        (( COMP_POINT -= \${#COMP_LINE} ))
                        COMP_LINE=\${COMP_LINE/$alias_name/$alias_cmd $alias_args}
                        (( COMP_POINT += \${#COMP_LINE} ))
                        $compl_func
                    }" >> "$tmp_file"
                    new_completion="${new_completion/ -F $compl_func / -F $compl_wrapper }"
            fi
        fi

        # replace completion trigger by alias
        new_completion="${new_completion% *} $alias_name"
        echo "$new_completion" >> "$tmp_file"
    done < <(alias -p | sed -Ene "s/$alias_regex/\1 '\2' '\3'/p")
    source "$tmp_file" && rm -f "$tmp_file"
}; alias_completion

对于简单的（仅用于命令，没有参数）别名，它将为别名分配原始的完成函数。对于带有参数的别名，它将创建一个包装器函数，该函数将多余的参数插入原始的完成函数中。

与它演变而来的脚本不同，该函数尊重别名命令及其参数的引号（但前者必须与完成命令匹配，并且不能嵌套），并且它应可靠地将别名过滤掉到命令列表和管道（被跳过，因为如果不重新创建完整的Shell命令行解析逻辑就无法找出要完成的操作）。

用法

将代码另存为shell脚本文件，然后将其保存为源代码.bashrc（或相关的点文件），或者将其批发（或批发到）。重要的是在设置完bash完成和别名定义之后调用该函数（上面的代码本着“源代码和忘记”的精神立即在其定义之后调用该函数，但是如果可以，则可以将调用移到下游的任何位置更适合您）。如果您不希望在函数退出后在您的环境中使用该函数，则可以unset -f alias_completion在调用该函数后进行添加。

笔记

如果您使用的是bash4.1或更高版本，并且使用动态加载的补全，则脚本将尝试加载所有别名命令的补全，以便它可以为您的别名构建包装函数。