5
You're looking for (call-process-shell-command "echo ${GOPATH}" nil t nil). In this case, ${PATH} is syntax defined by a shell, not a native call, so you'll need to invoke a shell to interpret it.
However, you may be interested in (insert (getenv "GOPATH")) which is considerably more direct, as it simply reads the environment instead of spawning a shell to ...
4
setenv-internal and setenv change the list stored in process-environment (as local or special variable) by side-effects.
It does not help if you assign the list (pointer) to a local variable process-environment. You still have only a single list for the process-environment which is just bound to two variables -- the global variable process-environment and ...
3
You've quoted the list:
:command '("sh" "-c" body)
So you have passed it a symbol body not the string value of the variable.
Try:
:command (list "sh" "-c" body)
or:
:command `("sh" "-c" ,body)
Either of which cause body to be evaluated to its string value.
2
I just found this:
Proxy shell designed for use with Emacs on Windows 95 and NT. [...]
The main function is simply to process the "-c string" option in the way /bin/sh does, since the standard Windows command shells use the convention that everything after "/c" (the Windows equivalent of "-c") is the input string.
Personally, I don't see cases where ...
2
The c-function call-process is the basis for creating synchronous processes in Emacs. So you don't get more with any other functions.
The info page (elisp) Synchronous Processes contains the following section:
You can’t directly specify a buffer to put the error output
in; that is too difficult to implement. But you can achieve
...
2
The "let binding" way is the following (notice that contrary to Tobias's answer, this does not involve any copying or "set"ting):
(let ((process-environment
(cons "HOME"
(cons (concat "OLDHOME=" (getenv "HOME"))
process-environment))))
(start-process "proc" (current-buffer) ...))
1
You can use something like the following with M-|:
cat > tmp.txt && python -m doctest -v tmp.txt
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