~ substitution

~ substitution

[sergio]

Hello.

Is it possible, to control ~ substitution?
When I type 'echo ~' I get '/home/sergio' --- all right.
When I type 'echo a~b' I get 'a~b' --- all right.
Also sh and bash do the same.

But when I type 'echo h=~' (or h=~sergio, or h=~/some/path) I get 'h=~'.
sh does the same, and bash will out 'h=/home/sergio'.

How to control this? Why this may be bad? May be this is a bug?

-- 
sergio.

Re: ~ substitution

[Guillaume Brunerie]

[-- Attachment #1: Type: text/plain, Size: 1069 bytes --]

2011/1/8 sergio <mailbox@sergio.spb.ru>

> Hello.
>
> Is it possible, to control ~ substitution?
> When I type 'echo ~' I get '/home/sergio' --- all right.
> When I type 'echo a~b' I get 'a~b' --- all right.
> Also sh and bash do the same.
>
> But when I type 'echo h=~' (or h=~sergio, or h=~/some/path) I get 'h=~'.
> sh does the same, and bash will out 'h=/home/sergio'.
>
> How to control this? Why this may be bad? May be this is a bug?
>

Hi,

Try 'setopt magicequalsubst'.


man zshexpn:
[…]
FILENAME EXPANSION
    Each  word is checked to see if it begins with an unquoted `~'.
[…]
  Notes
    Filename  expansion is performed on the right hand side of a parameter
    assignment, including those appearing after commands  of  the  typeset
    family.
[…]
    If the option MAGIC_EQUAL_SUBST is set, any unquoted shell argument in
    the  form  `identifier=expression' becomes eligible for file expansion
    as described in the previous paragraph.  Quoting the  first  `='  also
    inhibits this.
[…]


Guillaume

Re: ~ substitution

[Mikael Magnusson]

On 8 January 2011 10:42, sergio <mailbox@sergio.spb.ru> wrote:
> Hello.
>
> Is it possible, to control ~ substitution?
> When I type 'echo ~' I get '/home/sergio' --- all right.
> When I type 'echo a~b' I get 'a~b' --- all right.
> Also sh and bash do the same.
>
> But when I type 'echo h=~' (or h=~sergio, or h=~/some/path) I get 'h=~'.
> sh does the same, and bash will out 'h=/home/sergio'.
>
> How to control this? Why this may be bad? May be this is a bug?

try setopt magicequalsubst

-- 
Mikael Magnusson

Re: ~ substitution

[Atom Smasher]

On Sat, 8 Jan 2011, sergio wrote:

> But when I type 'echo h=~' (or h=~sergio, or h=~/some/path) I get 'h=~'. 
> sh does the same, and bash will out 'h=/home/sergio'.
>
> How to control this? Why this may be bad? May be this is a bug?
======================

echo foo=${:-~}
foo=/home/atom


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