* Some bugs in inferior shell doc and handling
@ 2006-12-14 16:17 Lennart Borgman
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From: Lennart Borgman @ 2006-12-14 16:17 UTC (permalink / raw)
Shell argument quoting on w32 is difficult! I looked at this again and
think I found a couple of more bugs.
******* defun shell:
doc string says
Program used comes from variable `explicit-shell-file-name',
or (if that is nil) from the ESHELL environment variable,
or else from SHELL if there is no ESHELL.
The last line should probably be
or else from shell-file-name if there is no ESHELL.
Info has the same doc bug.
**** environ var ESHELL doc:
(info "(emacs) General Variables") says
`ESHELL'
Used for shell-mode to override the `SHELL' environment variable.
I think ESHELL is rather used for starting the inferior process for
`shell' and `term'.
**** defun term:
Is this supposed to work on w32? It currently does not which is a bug.
Either the doc string should say it does not work on w32 or it should
work I think.
**** defcustom explicit-shell-file-name
Doc string is unclear to me. Does "explicitly requested inferior shells"
simply mean "interactive shells started by `shell'?
**** defun w32-shell-name
This is the worst bug. The intention of this function is unclear. The
doc string does not tell its intended use however and that is to me a
bug. w32-shell-dos-semantics uses w32-shell-name but should probably
just use shell-file-name instead since that is what is used when
starting non-interactive inferior shells AFAICS. This is currently a bug
in w32-shell-dos-semantics.
w32-shell-name is however also used in bat-generic-mode-compile and
bat-generic-mode-run-as-comint which seems to assume that it points to
cmd.exe or command.com. This is another bug (or two). Maybe
w32-shell-name should be for that instead? Perhaps there are people out
there using w32-shell-name so I instead suggest a new function like this
for use in those bat-* functions
(defun w32-default-console-name()
"Return "cmd.exe" on NT and "command.com" on DOS."
...)
Or perhaps just fix the bat-* functions?
**** defun text-start-shell
This supposes a unix style shell. However it does not check that it
actually is a unix style shell. This is a bug. Could it use w32 style
shells too if text-start-shell was changed to allow this?
The way it chooses shells suggests to me that it also should check
explicit-shell-file-name (before ESHELL) to be consistent with the use
of these variables. But I am not sure about the intention here. Maybe
the ESHELL test should be removed instead?
**** The use of SHELL and ESHELL
This is an important matter I believe. I wonder about the use of SHELL
and ESHELL. SHELL is used to initialize shell-file-name. Why should it
be used more in the code? What about starting inferior shells? If you
change shell-file-name do you have to change SHELL to?
Could not ESHELL be used in the same way to initialize
explicit-shell-file-name?
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