While programming in emacs have you ever felt, you have a tab character (it is “\t” and not 8 contiguous space) and when you press backspace, instead of deleting the “\t” character, it deletes the characters one by one. It happens atleast in c, c++ mode and but not in python-mode. So you press a tab character to undo that press backspace 8 times. Isnt that tedious?
In the background the backspace character is attached to a function called “backward-delete-char-untabify”. This first converts the tab to chars and delete one character.
Lets fix it,
put this in your .emacs
(gloabl-set-key [backspace] ‘backward-delete-char)
This function does only one job, just delete the preceding character, including “\t”.
This gets applied globally everywhere in emacs. But we want to do this only when do programming. Lets do this only when we load the c-mode by doing the following
(add-hook ‘c-mode-hook ‘(lambda ()
(local-set-key [backspace] ‘backward-delete-char)))
Add this to the specific mode’s hook where ever you want to fix.
Ofcourse, the above was a poor man’s solution. I did not mention it fully. When c-mode gets loaded the backspace is bound to c-electric-backspace. This take two direction based on the inputs and a variable.
first it checks the variable c-hungry-delete-key, if its true, it calls c-hungry-delete-backward which delete all the whitespace including the new line. By default this is set to nil. If you want this do M-x c-toggle-hungry-state.
Otherwise it calls the function pointed by the variable c-backspace-function. By default it points to backward-delete-char-untabify. This is where we reach if you have not modified any variable.
Now we have two solution,
1. set the variable “c-backspace-function” to “backward-delete-char”
2. The backward-delete-char-untabify again operate based on the variable “backward-delete-char-untabify-method” by default its untabify. It can take 4 values,
“untabify” – convert tab to space and delete one char
“hungry” – delete all the tabs, space backward
“all” – delete all the tabs, space and newline backward
nil – delete only one character whatever it is.
Our expectation is to delete one tab at a time. So set the variable backward-delete-char-untabify-method to nil. That should do the job