代码生成器与ORM(Code generator vs ORM)

 在Emacs中缺省处理这些“姐妹关键”的方式是将特殊键（如tab和return ）重定向到它们的ASCII等价物，然后仅将键绑定添加到ASCII版本。 因此，您可以使用类似的方式轻松地为非ASCII版本添加新的含义 
 
(global-set-key [return] 'my-new-command)
 
 但在你的情况下，你想要做的倒退就是在改变Cm同时让return行为像以前一样。 我能想到的最可靠的方法就是这样做（从大多数主要/次要模式绑定的角度来看，它是可靠的），可以将Cm早期无条件地重新映射到一些新事件，如下所示： 
 
(define-key input-decode-map [?\C-m] [C-m])
(define-key input-decode-map [?\C-i] [C-i])
 
 这不会影响return和tab的处理，因为在function-key-map之前应用了input-decode-map function-key-map ，即在这些键变成ASCII控制键之前。 所以你可以这样做： 
 
(global-set-key [C-m] 'my-new-command)
(global-set-key [C-i] 'my-newer-command)
 
 缺点是这不仅适用于对Ci绑定，而且也适用于对Cc Ci绑定，现在只能用作Cc TAB （有时会很好，但偶尔可能会减少助记符）。 
 
 另一个缺点是，如果有一个tab绑定，那么tab将无法用于达到一个Ci绑定。 但是我们可以通过添加以下内容来解决这两个问题： 
 
(define-key function-key-map [C-i] [?\C-i])
(define-key function-key-map [C-m] [?\C-m])
 
 这会在没有使用新事件的绑定的情况下将新的Ci事件转换回正常的Ci 。 

The way these "sister keys" are handled by default in Emacs is to redirect (via function-key-map) the special keys (like tab, and return) to their ASCII equivalent, and then only add key-bindings to the ASCII version. So you can easily add new meanings to the non-ASCII version with something like
 
(global-set-key [return] 'my-new-command)
 
but in your case you want to do the reverse which is to let return behave as before while changing C-m. The most reliable way I can think of to do that (reliable in the sense that it should work with most major/minor modes bindings) is to remap C-m early and unconditionally to some new event, as in:
 
(define-key input-decode-map [?\C-m] [C-m])
(define-key input-decode-map [?\C-i] [C-i])
 
this will not affect the handling of return and tab since input-decode-map is applied before function-key-map, i.e. before those keys are turned into ASCII control keys. So you can then do: 
 
(global-set-key [C-m] 'my-new-command)
(global-set-key [C-i] 'my-newer-command)
 
A downside is that this will not only apply to bindings for C-i but also to bindings for C-c C-i which will now only work as C-c TAB (which will sometimes be just fine, but might occasionally be less mnemonic).
 
Another downside is that if there is a binding for tab, then tab won't be useable to reach a C-i binding. But we can fix those two problems by adding the following:
 
(define-key function-key-map [C-i] [?\C-i])
(define-key function-key-map [C-m] [?\C-m])
 
which will turn the new C-i event back into a normal C-i in case where there is no binding that uses the new event.