PATH 去重函数 - bash 4+ / zsh 兼容

path_clean.sh

# PATH 去重函数 - bash 4+ / zsh 兼容
# 添加到 ~/.bashrc 或 ~/.zshrc
# eg: 
# cpp > /dev/null

# 去重 PATH，保留首次出现的条目
dedup_path() {
    local -A seen
    local new_path=""
    local dir
    
    while IFS= read -r dir; do
        [[ -z "$dir" ]] && continue
        if [[ -z "${seen[$dir]}" ]]; then
            seen[$dir]=1
            new_path="${new_path:+$new_path:}$dir"
        fi
    done < <(echo "$PATH" | tr ':' '\n')
    
    export PATH="$new_path"
    echo "PATH 已去重: $(echo "$PATH" | tr ':' '\n' | wc -l | tr -d ' ') 条目"
}

# 重置 PATH 为系统默认值
reset_path() {
    if [[ "$(uname)" == "Darwin" ]]; then
        PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
        [[ -d "/opt/homebrew/bin" ]] && PATH="/opt/homebrew/bin:/opt/homebrew/sbin:$PATH"
    else
        PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
    fi
    
    local p
    for p in "$HOME/.local/bin" "$HOME/bin" "$HOME/.cargo/bin" "$HOME/go/bin"; do
        [[ -d "$p" ]] && PATH="$p:$PATH"
    done
    
    dedup_path
}

# 显示 PATH（带序号和存在性检查）
show_path() {
    local i=1 dir
    while IFS= read -r dir; do
        [[ -z "$dir" ]] && continue
        if [[ -d "$dir" ]]; then
            printf "%2d. %s\n" $i "$dir"
        else
            printf "%2d. %s \e[31m[无效]\e[0m\n" $i "$dir"
        fi
        ((i++))
    done < <(echo "$PATH" | tr ':' '\n')
}

# 清理 PATH：去重 + 移除无效目录
clean_path() {
    local -A seen
    local new_path=""
    local dir
    
    while IFS= read -r dir; do
        [[ -z "$dir" || ! -d "$dir" ]] && continue
        if [[ -z "${seen[$dir]}" ]]; then
            seen[$dir]=1
            new_path="${new_path:+$new_path:}$dir"
        fi
    done < <(echo "$PATH" | tr ':' '\n')
    
    export PATH="$new_path"
    echo "PATH 已清理: $(echo "$PATH" | tr ':' '\n' | wc -l | tr -d ' ') 条目"
}

alias dp='dedup_path'
alias sp='show_path'
alias rp='reset_path'
alias cpp='clean_path'