`$FOO' where FOO is an environment variable name means to substitute
the value of that variable. The variable name should be terminated
with a character not a letter, digit or underscore; otherwise, enclose
-the entire variable name in braces. Use `$$' to insert a single
-dollar sign."
+the entire variable name in braces. For instance, in `ab$cd-x',
+`$cd' is treated as an environment variable.
+
+Use `$$' to insert a single dollar sign."
(let ((start 0))
(while (string-match
(eval-when-compile
- (rx (or (and "$" (submatch (1+ (regexp "[:alnum:]_"))))
+ (rx (or (and "$" (submatch (1+ (regexp "[[:alnum:]_]"))))
(and "${" (submatch (minimal-match (0+ anything))) "}")
"$$")))
string start)
(defun setenv (variable &optional value unset substitute-env-vars)
"Set the value of the environment variable named VARIABLE to VALUE.
-VARIABLE should be a string. VALUE is optional; if not provided or is
-`nil', the environment variable VARIABLE will be removed. UNSET
+VARIABLE should be a string. VALUE is optional; if not provided or
+nil, the environment variable VARIABLE will be removed. UNSET
if non-nil means to remove VARIABLE from the environment.
SUBSTITUTE-ENV-VARS, if non-nil, means to substitute environment
variables in VALUE with `substitute-env-vars', where see.
(memq (coding-system-base locale-coding-system) codings))
(error "Can't encode `%s=%s' with `locale-coding-system'"
variable (or value "")))))
- (if unset
+ (if unset
(setq value nil)
(if substitute-env-vars
(setq value (substitute-env-vars value))))
(provide 'env)
+;;; arch-tag: b7d6a8f7-bc81-46db-8e39-8d721d4ed0b8
;;; env.el ends here