bash - 在 vim 中打开某些文件类型之前如何发出警告？

Question

依赖命令行自动完成时，很容易不小心用 vim 打开一个大的二进制文件或数据文件。

是否可以在 vim 中打开某些文件类型时添加交互式警告？

例如，我想在打开没有扩展名的文件时添加警告:

> vim someBinary
Edit someBinary? [y/N]

或者也许:

> vim someBinary
# vim buffer opens and displays warning about filetype, 
# giving user a chance to quit before loading the file

这可以应用于一系列扩展，例如 .pdf、.so、.o、.a ，没有扩展等

preventing vim from opening binary files 上有一个相关问题, 但它主要是关于修改自动完成以防止首先意外打开文件。

Answer 1

下面是我想出的解决方案，使用 vim 自动命令和 BufReadCmd 事件。它有很多 vimscript，但它非常健壮。如果打开的文件是非 ascii 文件或具有列入黑名单的扩展名(本例中为 .csv 和 .tsv)，它会发出警告:

augroup bigfiles
   " Clear the bigfiles group in case defined elsewhere
   autocmd!
   " Set autocommand to run before reading buffer
   autocmd BufReadCmd * silent call PromptFileEdit()
augroup end



" Prompt user input if editing an existing file before reading
function! PromptFileEdit()
    " Current file
    let file = expand("%")
    " Whether or not we should continue to open the file
    let continue = 1

    " Skip if file has an extension or is not readable
    if filereadable(file) && (IsNonAsciiFile(file) || IsBlacklistedFile())
        " Get response from user
        let response = input('Are you sure you want to open "' . file . '"? [y/n]')

        " Bail if response is a 'n' or contains a 'q'
        if response ==? "n" || response =~ "q"
            let continue = 0
            if (winnr("$") == 1)
                " Quit if it was the only buffer open
                quit
            else
                " Close buffer if other buffers open
                bdelete
            endif
        endif
    endif

    if continue == 1
        " Edit the file
        execute "e" file
        " Run the remaining autocommands for the file
        execute "doautocmd BufReadPost" file
    endif

endfunction

" Return 1 if file is a non-ascii file, otherwise 0
function! IsNonAsciiFile(file)
    let ret = 1
    let fileResult = system('file ' . a:file)
    " Check if file contains ascii or is empty
    if fileResult =~ "ASCII" || fileResult =~ "empty" || fileResult =~ "UTF"
        let ret = 0
    endif
    return ret
endfunction

" Return 1 if file is blacklisted, otherwise 0
function! IsBlacklistedFile()
    let ret = 0
    let extension = expand('%:e')

    " List contains ASCII files that we don't want to open by accident
    let blacklistExtensions = ['csv', 'tsv']

    " Check if we even have an extension
    if strlen(extension) == 0
        let ret = 0
    " Check if our extension is in the blacklisted extensions
    elseif index(blacklistExtensions, extension) >= 0
        let ret = 1
    endif

    return ret
endfunction

要在启用语法高亮的情况下阅读，请参阅 gist .

也许不是特别优雅，但我很享受学习 vimscript 的过程。

我对 vimscript 不太熟悉，所以我确信还有改进的余地——欢迎提出建议和替代解决方案。

注意:由于调用 file，预计这不会在 WSL 或 Cygwin 之外的 Windows 系统上运行。