I'm confused about something. With the release binary of 7.4 on windows,
for
echo exists("$xyzzy")
the following two give different results (xyzzy is not in the shell's
environment).
xyzzy=x vim
xyzzy= vim
This would seem to indicate that ":exists" is not able to detect if a
variable does not exist in the environment. But that's not the real issue.
Since vim executes a wide variety of commands, it should be possible to
unset env variables, either fixing unlet or some other mechanism. And
coming up with a way to detect not in env, should be trivial; all this
discussion is a spec issue.
-ernie
On 2/2/2014 7:43 PM, ZyX wrote:
On Monday, February 3, 2014 7:22:28 AM UTC+4, Andre Sihera wrote:
On 03/02/14 11:57, ZyX wrote:
`exists()` does not have to be changed. Neither does result of accessing
non-existent. I am only talking about `:unlet`.
Before you sit there in your arrogance and blast every suggestion
that is put before you, why don't you READ people's posts.
How can you have an "unlet" that removes it from the environment
when the non-existent variable isn't detectable with ViM's current
behaviour?
1. It is. Just use `exists()`.
2. It is. Use `system('python -c "import os; print (\"VAR\" in os.environ)"')`.
The unlet command is *useless* unless you also have a
way to actually detect a non-existent variable from a purely empty
one. And that isn't possible in ViM as all usages of non-existent
variables in ViM are the same as those on "defined but empty"
variables.
Without `exists()` this would be useless for my purpose (restore environment
after it was altered). Fortunately exists() work.
Well, how do you propose to solve it?
`:unlet $ENV` should remove environment from `envp` global (on POSIX systems). I guess
there is an equivalent for Windows. If no means of such removal are not known it should
act like `:let $ENV=""`.
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