如何使用 pipe 过滤批处理文件？

Question

I am trying to filter (git staged) files and concatenate it. I am getting error as file not found. refer

set List='git diff --cached --name-only --diff-filter=ACMR'
set output=
for /f "delims=" %%a in (%List%) do ( 
      (Echo "%%a"| find ".java" set output=!output! "%%a") || (
    REM    set output=!output! "%%a" 
   ))
echo %output%

Thanks in advance!

Answer 1

Unless I've misunderstood what you're doing, it would make it much more efficient if you filtered the results within the parenthesized command instead of the `do` portion:

 @Set "ListCommand='git diff --cached --name-only --diff-filter^=ACMR ^^^| "%%__AppDir__%%findstr.exe" /L /I /E ".java"'" @Set "output=" @For /F Delims^= %%G In (%ListCommand%)Do @If Not Defined output (Set output="%%~G")Else Set "output=!output! "%%~G"" @Echo %output%

This assumes that you have delayed expansion enabled, and that none of your returned file names contain exclamation marks. It also assumes that you do not have too many returned filenames, otherwise the size of the environment could be exceeded.