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#Emacs python mode how to#
#Emacs python mode code#
#Emacs python mode download#

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#Emacs python mode code#

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#Emacs python mode download#

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#Emacs python mode how to#

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We can circumvent this problem by adding a hook to kill-emacs-hook that traverses the list of all buffers and writes the input ring (if it is available) of each buffer to a file. Apparently, when Emacs itself is killed, kill-buffer-hook is not run on individual buffers. Therefore we also add comint-write-input-ring to kill-buffer-hook this has no effect if the buffer is not associated with a process or doesn’t have comint-input-ring-file-name set: (add-hook 'kill-buffer-hook 'comint-write-input-ring) For example, the input ring is not written to the file if the buffer associated with the process is killed, because the process sentinel is invoked when buffer-local variables (in particular, comint-input-ring-file-name and comint-input-ring) are gone. Unfortunately, the above solution doesn’t always work. Now, to enable reading/writing of command history in, say, inferior-haskell-mode buffers, simply add turn-on-comint-history to inferior-haskell-mode-hook: (add-hook 'inferior-haskell-mode-hook 'turn-on-comint-history) ( let ((process (get-buffer-process (current-buffer)))) (insert (format "\nProcess %s %s" process event)))))) Here is an implementation: ( defun comint-write-history-on-exit (process event) So, the idea is to change (again, in the mode hook) the process sentinel to the function that will not only insert the event description into the process buffer, but will also write the input ring to the history file. The sentinel receives two arguments: the process for which the event occurred, and a string describing the type of event. The process sentinel is also called if the process exits. From the documentation:Ī process sentinel is a function that is called whenever the associated process changes status for any reason, including signals (whether sent by Emacs or caused by the process’s own actions) that terminate, stop, or continue the process.

This is achieved by changing the process sentinel. We want to write the input ring to the file when the interpreter process exits. We can associate with each interpreter a file in which its history will be stored, for example inferior-haskell-history for ghci and inferior-ruby-history for irb, and in the corresponding mode hook we can set the variable comint-input-ring-file-name to the appropriate value and call comint-read-input-ring. The former is easy to achieve: this is what mode hooks are for. We would like Emacs to behave as follows: whenever we run an interpreter, its input ring is read from a file associated with that interpreter and is written to that file when we quit the interpreter. The variable comint-input-ring-file-name is buffer-local, and can be nil, in which case the above functions are no-ops. In particular, the name of the history file is given by the variable comint-input-ring-file-name, and the functions that read/write the input ring are comint-read-input-ring and comint-write-input-ring. Furthermore, comint offers some facilities for reading/writing the input ring from/to a history file. The command history is called an input ring and is stored in the buffer-local variable comint-input-ring. This is very annoying, and below I offer a way to fix it.Įmacs interpreter modes are derived from comint mode.

If you run interactive interpreters (e.g., python, irb, ghci etc.) inside Emacs, you have probably observed that they lose command history between sessions.