elisp is a good language, I find it can handle all kind of jobs, but can I use it like a shell script?
i.e. execute some *.el files from the console, without launching Emacs. Or launch Emacs, but don't enter interactive mode.
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问题:
回答1:
You can most definitely run elisp scripts in Emacs without starting the editor interface.
Here are the notes I've made/copied from a few extremely useful Q&As on the subject here at S.O. (and the following two in particular).
- Emacs shell scripts - how to put initial options into the script?
- Idomatic batch processing of text in Emacs?
;;;; Elisp executable scripts ;; --batch vs --script ;; M-: (info "(emacs) Initial Options") RET ;; M-: (info "(elisp) Batch Mode") RET ;; Passing additional command-line arguments to Emacs: ;; https://stackoverflow.com/questions/6238331/#6259330 ;; ;; For robustness, it's important to both pass '--' as an argument ;; (to prevent Emacs from trying to process option arguments intended ;; for the script), and also set "argv" to nil at the end of the script ;; (to prevent Emacs from visiting the non-option arguments as files). ;; ;; #!/bin/sh ;; ":"; exec emacs --no-site-file --script "$0" -- "$@" # -*-emacs-lisp-*- ;; (print (+ 2 2)) ;; (setq argv nil) ;; always end with this ;; Processing with STDIN and STDOUT via --script: ;; https://stackoverflow.com/questions/2879746/#2906967 ;; ;; #!/usr/local/bin/emacs --script ;; ;;-*- mode: emacs-lisp;-*- ;; ;; (defun process (string) ;; "just reverse the string" ;; (concat (nreverse (string-to-list string)))) ;; ;; (condition-case nil ;; (let (line) ;; ;; commented out b/c not relevant for `cat`, but potentially useful ;; ;; (princ "argv is ") ;; ;; (princ argv) ;; ;; (princ "\n") ;; ;; (princ "command-line-args is" ) ;; ;; (princ command-line-args) ;; ;; (princ "\n") ;; ;; (while (setq line (read-from-minibuffer "")) ;; (princ (process line)) ;; (princ "\n"))) ;; (error nil)) Emacs aside, the only other elisp interpreter/compiler I'm aware of is Guile. If you're keen on general coding in elisp, that should be worth a look (especially if performance is a concern).