* lisp/emacs-lisp/helpers.el: Add some string helpers.

(string-trim-left): Removes leading whitespace.
(string-trim-right): Removes trailing whitespace.
(string-trim): Removes leading and trailing whitespace.

1 files changed, 16 insertions, 0 deletions

diff --git a/lisp/emacs-lisp/helpers.el b/lisp/emacs-lisp/helpers.el
index 73c2ff1c15c..fd5985467b5 100644
--- a/lisp/emacs-lisp/helpers.el
+++ b/lisp/emacs-lisp/helpers.el
@@ -37,6 +37,22 @@
     (maphash (lambda (_k v) (push v values)) hash-table)
     values))
 
+(defsubst string-trim-left (string)
+  "Remove leading whitespace from STRING."
+  (if (string-match "\\`[ \t\n\r]+" string)
+      (replace-match "" t t string)
+    string))
+
+(defsubst string-trim-right (string)
+  "Remove trailing whitespace from STRING."
+  (if (string-match "[ \t\n\r]+\\'" string)
+      (replace-match "" t t string)
+    string))
+
+(defsubst string-trim (string)
+  "Remove leading and trailing whitespace from STRING."
+  (string-trim-left (string-trim-right string)))
+
 (provide 'helpers)
 
 ;;; helpers.el ends here