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Introduce letf! convenience macro

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A more succinct cl-letf, which allows for local functions and macros.
This commit is contained in:
Henrik Lissner 2020-04-29 21:08:17 -04:00
parent c3a84f0fbf
commit d12752324a
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GPG key ID: 5F6C0EA160557395
12 changed files with 113 additions and 115 deletions
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47
core/core-lib.el
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@ -191,6 +191,37 @@ aliases."
(setenv (car var) (cdr var)))
,@body))
(defmacro letf! (bindings &rest body)
"Temporarily rebind function and macros in BODY.
BINDINGS is either a) a list of, or a single, `defun' or `defmacro'-ish form, or
b) a list of (PLACE VALUE) bindings as `cl-letf*' would accept.
TYPE is either `defun' or `defmacro'. NAME is the name of the function. If an
original definition for NAME exists, it can be accessed as a lexical variable by
the same name, for use with `funcall' or `apply'. ARGLIST and BODY are as in
`defun'.
\(fn ((TYPE NAME ARGLIST &rest BODY) ...) BODY...)"
(declare (indent defun))
(setq body (macroexp-progn body))
(when (memq (car bindings) '(defun defmacro))
(setq bindings (list bindings)))
(dolist (binding (nreverse bindings) body)
(let ((type (car binding))
(rest (cdr binding)))
(setq
body (pcase type
(`defmacro `(cl-macrolet ((,(car rest) ,(cadr rest) ,@(cddr rest))) ,body))
(`defun `(cl-letf* ((,(car rest) (symbol-function #',(car rest)))
((symbol-function #',(car rest))
(lambda ,(cadr rest) ,@(cddr rest))))
,body))
(_
(when (eq (car-safe type) 'function)
(setq type `(symbol-function ,type)))
`(cl-letf ((,type ,@rest)) ,body)))))))
(defmacro quiet! (&rest forms)
"Run FORMS without generating any output.
@ -198,15 +229,13 @@ This silences calls to `message', `load-file', `write-region' and anything that
writes to `standard-output'."
`(cond (doom-debug-mode ,@forms)
((not doom-interactive-mode)
(let ((old-fn (symbol-function 'write-region)))
(cl-letf ((standard-output (lambda (&rest _)))
((symbol-function 'load-file) (lambda (file) (load file nil t)))
((symbol-function 'message) (lambda (&rest _)))
((symbol-function 'write-region)
(lambda (start end filename &optional append visit lockname mustbenew)
(unless visit (setq visit 'no-message))
(funcall old-fn start end filename append visit lockname mustbenew))))
,@forms)))
(letf! ((standard-output (lambda (&rest _)))
(defun load-file (file) (load-file nil t))
(defun message (&rest _))
(defun write-region (start end filename &optional append visit lockname mustbenew)
(unless visit (setq visit 'no-message))
(funcall write-region start end filename append visit lockname mustbenew)))
,@forms))
((let ((inhibit-message t)
(save-silently t))
(prog1 ,@forms (message ""))))))