I am working on a project whose files are different in encoding.(My OS is centos 7)

我正在做一个项目，它的文件编码不同。(我的操作系统是Centos 7)

For example, $SRC/a.cpp may encoded in UTF-8, while $SRC/b.cpp is encoded in GB 2312(simplified Chinese).

例如，$src/a.cpp可能以UTF-8编码，而$src/b.cpp则以GB 2312(简体中文)编码。

Now if I enter git diff, the content will not display properly due to the mixed encoding.

现在，如果我输入git diff，由于混合编码，内容将不能正确显示。

I've tried iconv like this

我试过像这样的图标

git diff HEAD~1 | iconv -f gb2312 -t utf8 | less

It works well if all the files involved are encoded in GB 2312. But if any UTF-8 file is mixed, then iconv will broke like this

如果所有涉及的文件都是以GB 2312编码的，它就能很好地工作。但如果任何UTF-8文件混合在一起，那么icv将像这样被破坏

some well displayed UTF-8 text
...
iconv: illegal input sequence at position 120

My question is that if it is possible to make commands like git diff work properly without changing the file itself? I hope there can be some scripts filtering non-UTF-8 file for iconv or some git confiuration that can run iconv for non-UTF-8 file only.

我的问题是，是否有可能让像git diff这样的命令在不更改文件本身的情况下正常工作？我希望可以有一些脚本过滤非UTF-8文件的图标或一些git配置，可以运行的图标只为非UTF-8文件。

Edit: The client of this project requests some files to have specific encodings and wants as less changes as possible for stability, so modifying files' encoding directly is not possible. A workaround without modifying the project is prefer.

编辑：这个项目的客户端要求一些文件有特定的编码，并希望尽可能少的更改以保持稳定性，因此不可能直接修改文件的编码。最好是不修改项目的解决方法。

You might need a git config diff driver

您可能需要一个Git配置比较驱动程序

That driver script would first identify the encoding of each file and then convert it to UTF-8 if necessary before showing the diff.

该驱动程序脚本将首先识别每个文件的编码，然后在显示差异之前将其转换为UTF-8(如果需要)。

Create a shell script (for instance git-diff-encoding.sh, with chmod +x git-diff-encoding.sh) which identifies the encoding of the files and then converts them to UTF-8 if necessary before showing the diff.

创建一个Shell脚本(例如git-diff-encoding.sh，使用chmod+x git-diff-encoding.sh)来标识文件的编码，然后根据需要在显示diff之前将其转换为UTF-8。

#!/bin/bash

FILE1="path/to/file1"
FILE2="path/to/file2"

# Identify encoding of the files using file command
ENC1=$(file -bi "$FILE1" | awk -F charset= '{print $2}')
ENC2=$(file -bi "$FILE2" | awk -F charset= '{print $2}')

# Convert files to UTF-8 if necessary
[ "$ENC1" != "utf-8" ] && iconv -f "$ENC1" -t utf-8 "$FILE1" -o "$FILE1".utf8
[ "$ENC2" != "utf-8" ] && iconv -f "$ENC2" -t utf-8 "$FILE2" -o "$FILE2".utf8

# Run git diff with potentially converted files
git diff --no-index "${FILE1}${ENC1:+.utf8}" "${FILE2}${ENC2:+.utf8}"

In your .git/config file, add the following lines to define a new diff driver called "encoding":

在您的.git/config文件中，添加以下行以定义一个名为“Coding”的新的diff驱动程序：

[diff "encoding"]
    command = /path/to/your/git-diff-encoding.sh

Tell Git which files should be handled by this new diff driver. You can do this in your repository's .gitattributes file (create it, if it does not exist, at the root folder of your Git repository). Add lines specifying the files to be handled by your new diff driver, for example:

告诉Git这个新的diff驱动程序应该处理哪些文件。您可以在存储库的.gittributes文件中执行此操作(如果该文件不存在，则在Git存储库的根文件夹中创建它)。添加指定要由新的diff驱动程序处理的文件的行，例如：

*.cpp diff=encoding

Now, git will use your custom diff script when running git diff for files matching the patterns specified in the .gitattributes file.

现在，当运行git diff时，git将使用您的自定义diff脚本来匹配.gitattributes文件中指定的模式。