在 Emacs 上，获取通过 Emacs-Lisp 发送到缓冲区的命令的 output

Question

I would like to write a small script in ELisp that would:

1. send a command to a given buffer
2. get its output
3. parse it
4. send it to another buffer

I am struggling with point 2: I cant get the output of a command. For example, if I have a shell buffer on, I can use

(process-send-string "shell" "help\n")

to send "help" to my shell buffer. It will then show the list of the commands available. But how can I get this list to use it somewhere else?

Thanks,

S4m

Answer 1

(buffer-string) returns the contents of the current buffer, so (with-current-buffer <buf> (buffer-string)) will return the contents of <buf> .

Answer 2

I don't know the exact emacs commands for this off the top of my head, but one option would be to do the following:

• Set the mark in the shell buffer right below the command line
• Execute the command.
• Move the point to the end of the file and kill the text between there and the mark.
• Move to the destination buffer and yank the text into there.

Answer 3

Have you considered using the shell-command or shell-command-to-string functions?

The don't "send a command to a buffer" like you asked, but they do both allow running a command through a process that will be started just for that purpose and either dumping the output into a target buffer or collecting it into a string.