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Make better shell-command-to-string permanent

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Ivan Malison 2016-08-17 10:47:55 -07:00
parent 564cfbe5ee
commit d94e2b1cee
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1 changed files with 18 additions and 11 deletions
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dotfiles/emacs.d/README.org
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@ -958,6 +958,22 @@ A macro for composing functions together to build an interactive command to copy
(save-excursion
(perform-replace "\\n" "\n" nil nil delimited nil nil beg end nil)))))
#+END_SRC
** Non-Forking Shell Command To String
Emacs' built in ~shell-command-to-string~ function has the downside that it forks a new shell process every time it is executed. This means that any shell startup cost is incurred when this function is called.
The following implementation uses eshell's ~eshell-search-path~ to find the binary (which is the only reason ~shell-comand-to-string~ is typically used anyway, but it avoids incurring any shell-startup cost.
#+BEGIN_SRC emacs-lisp
;; We use `eshell-search-path' for this hack
(require 'eshell)
(defun imalison:shell-command-to-string (command)
(cl-destructuring-bind
(the-command . args) (split-string command " ")
(let ((binary-path (eshell-search-path the-command)))
(if binary-path
(apply 'projectile-call-process-to-string binary-path args)
(shell-command-to-string command)))))
#+END_SRC
** Other
#+BEGIN_SRC emacs-lisp
(defun imalison:join-paths (&rest paths)
@ -1949,21 +1965,12 @@ I use helm for almost all emacs completion
**** Avoid shell-command-to-string
See [[https://github.com/bbatsov/projectile/issues/1044][this issue]] for details.
#+BEGIN_SRC emacs-lisp
;; We use `eshell-search-path' for this hack
(require 'eshell)
(defun projectile-call-process-to-string (program &rest args)
(with-temp-buffer
(apply 'call-process program nil (current-buffer) nil args)
(buffer-string)))
(defun projectile-shell-command-to-string (command)
(cl-destructuring-bind
(the-command . args) (split-string command " ")
(let ((binary-path (eshell-search-path the-command)))
(if binary-path
(apply 'projectile-call-process-to-string binary-path args)
(shell-command-to-string command)))))
(defalias 'projectile-shell-command-to-string 'imalison:shell-command-to-string)
(defun projectile-files-via-ext-command (command)
"Get a list of relative file names in the project root by executing COMMAND."
@ -2647,7 +2654,7 @@ Taken from http://endlessparentheses.com/eval-result-overlays-in-emacs-lisp.html
***** Keybinds
#+BEGIN_SRC emacs-lisp
(emit-compose imalison:copy-eval-last-sexp
kill-new prin1-to-string eval-region-or-last-sexp)
kill-new prin1-to-string eval-last-sexp)
(emit-prefix-selector imalison:eval-last-sexp
eval-region-or-last-sexp