查看用meld代替svn默认的diff工具的源代码用meld代替svn默认的diff工具 0

== 安装meld ==

在Ubuntu下，只需一条简单的命令就可以了

 $:sudo apt-get install meld

== 让svn使用meld ==

编辑 "~/.subversion"目录下的"config"文件，将meld赋值给diff-cmd,如下所示：

 $gedit ~/.subversion/config

<pre class="prettyprint">
### Set diff-cmd to the absolute path of your 'diff' program.
###   This will override the compile-time default, which is to use
###   Subversion's internal diff implementation.
diff-cmd = meld
</pre>

此后，使用svn diff命令时，将调用meld工具进行比较。

同样的方法，还可用于更改编辑器等工具：
<pre class="prettyprint">
### Set editor-cmd to the command used to invoke your text editor.
###   This will override the environment variables that Subversion
###   examines by default to find this information ($EDITOR, 
###   et al).
# editor-cmd = editor (vi, emacs, notepad, etc.)
editor-cmd = gedit
</pre>

<span style="color:#ca6500;">
实践证明上述方法不可行(svn v1.6.12 | meld v1.5.0)，提示如下错误：
</span>

<pre>
Index: WifiEnabler.java
===================================================================
Usage: 
  meld                              启动时打开空白窗口
  meld <文件|目录>              开始版本控制比较
  meld <文件> <文件> [<文件>] 开始两向或三向文件比较
  meld <目录> <目录> [<目录>] 开始两向或三向目录比较
  meld <文件> <目录>            在文件和文件夹/文件之间开始比较

meld: error: no such option: -u
svn: “meld” 返回 2
</pre>

原因是svn diff的参数与meld不匹配，可按如下方法更改：

----

== 让svn使用meld，新版可行的方法 ==

=== 1、在目录~/.subversions/下，新建脚本文件 mydiff.sh ===

内容如下：

<pre class="prettyprint">
    #!/bin/sh  
      
    # Configure your favorite diff program here.  
    #"/usr/bin/bcompare" 
    DIFF="meld"  
    # DIFF="/usr/bin/meld"  
    # DIFF="/usr/bin/kompare"  
    # DIFF=env LANG=zh_CN.UTF-8 WINEPREFIX="/home/borqs/.wine" wine "C:\\Program Files\\Beyond Compare 2\\BC2.exe"  
      
    # Subversion provides the paths we need as the sixth and seventh   
    # parameters.  
    LEFT=${6}  
    RIGHT=${7}  
      
    # Call the diff command (change the following line to make sense for  
    # your merge program).  
    $DIFF $LEFT $RIGHT   
      
    # Return an errorcode of 0 if no differences were detected, 1 if some were.  
    # Any other errorcode will be treated as fatal.  
    return 0  
</pre>

=== 2、更改其可执行属性 ===

 $:chmod 777  ~/.subversion/mydiff.sh

=== 3、使svn diff命令指引到上述bash ===

 $:gedit ~/.subversion/config 

更改 diff-cmd:
<pre class="prettyprint">
diff-cmd =/home/kaigo/.subversion/mydiff.sh 
</pre>


参考资料：

http://ninofocus.com/2011/11/27/meld-for-svn-and-git/

http://blog.csdn.net/zzqhost/article/details/7290055