(defvar read-envvar-name-history nil)
(defun read-envvar-name (prompt &optional mustmatch)
"Read environment variable name, prompting with PROMPT.
Optional second arg MUSTMATCH, if non-nil, means require existing envvar name.
If it is also not t, RET does not exit if it does non-null completion."
(completing-read prompt
(mapcar (lambda (enventry)
(list (if enable-multibyte-characters
(decode-coding-string
(substring enventry 0
(string-match "=" enventry))
locale-coding-system t)
(substring enventry 0
(string-match "=" enventry)))))
process-environment)
nil mustmatch nil 'read-envvar-name-history))
(defvar setenv-history nil)
(defun substitute-env-vars (string)
"Substitute environment variables referred to in STRING.
`$FOO' where FOO is an environment variable name means to substitute
the value of that variable. The variable name should be terminated
with a character not a letter, digit or underscore; otherwise, enclose
the entire variable name in braces. For instance, in `ab$cd-x',
`$cd' is treated as an environment variable.
Use `$$' to insert a single dollar sign."
(let ((start 0))
(while (string-match
(eval-when-compile
(rx (or (and "$" (submatch (1+ (regexp "[[:alnum:]_]"))))
(and "${" (submatch (minimal-match (0+ anything))) "}")
"$$")))
string start)
(cond ((match-beginning 1)
(let ((value (getenv (match-string 1 string))))
(setq string (replace-match (or value "") t t string)
start (+ (match-beginning 0) (length value)))))
((match-beginning 2)
(let ((value (getenv (match-string 2 string))))
(setq string (replace-match (or value "") t t string)
start (+ (match-beginning 0) (length value)))))
(t
(setq string (replace-match "$" t t string)
start (+ (match-beginning 0) 1)))))
string))
(defun setenv (variable &optional value 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
nil, the environment variable VARIABLE will be removed.
Interactively, a prefix argument means to unset the variable.
Interactively, the current value (if any) of the variable
appears at the front of the history list when you type in the new value.
Interactively, always replace environment variables in the new value.
SUBSTITUTE-ENV-VARS, if non-nil, means to substitute environment
variables in VALUE with `substitute-env-vars', which see.
This is normally used only for interactive calls.
The return value is the new value of VARIABLE, or nil if
it was removed from the environment.
This function works by modifying `process-environment'.
As a special case, setting variable `TZ' calls `set-time-zone-rule' as
a side-effect."
(interactive
(if current-prefix-arg
(list (read-envvar-name "Clear environment variable: " 'exact) nil)
(let* ((var (read-envvar-name "Set environment variable: " nil))
(value (getenv var)))
(when value
(add-to-history 'setenv-history value))
(list var
(read-from-minibuffer (format "Set %s to value: " var)
nil nil nil 'setenv-history
value)
t))))
(if (and (multibyte-string-p variable) locale-coding-system)
(let ((codings (find-coding-systems-string (concat variable value))))
(unless (or (eq 'undecided (car codings))
(memq (coding-system-base locale-coding-system) codings))
(error "Can't encode `%s=%s' with `locale-coding-system'"
variable (or value "")))))
(and value
substitute-env-vars
(setq value (substitute-env-vars value)))
(if (multibyte-string-p variable)
(setq variable (encode-coding-string variable locale-coding-system)))
(if (and value (multibyte-string-p value))
(setq value (encode-coding-string value locale-coding-system)))
(if (string-match "=" variable)
(error "Environment variable name `%s' contains `='" variable)
(let ((pattern (concat "\\`" (regexp-quote (concat variable "="))))
(case-fold-search nil)
(scan process-environment)
found)
(if (string-equal "TZ" variable)
(set-time-zone-rule value))
(while scan
(cond ((string-match pattern (car scan))
(setq found t)
(if (eq nil value)
(setq process-environment (delq (car scan)
process-environment))
(setcar scan (concat variable "=" value)))
(setq scan nil)))
(setq scan (cdr scan)))
(or found
(if value
(setq process-environment
(cons (concat variable "=" value)
process-environment))))))
value)
(defun getenv (variable)
"Get the value of environment variable VARIABLE.
VARIABLE should be a string. Value is nil if VARIABLE is undefined in
the environment. Otherwise, value is a string.
This function consults the variable `process-environment'
for its value."
(interactive (list (read-envvar-name "Get environment variable: " t)))
(let ((value (getenv-internal (if (multibyte-string-p variable)
(encode-coding-string
variable locale-coding-system)
variable))))
(if (and enable-multibyte-characters value)
(setq value (decode-coding-string value locale-coding-system)))
(when (interactive-p)
(message "%s" (if value value "Not set")))
value))
(provide 'env)