From: Tomoki Sekiyama <tomoki.sekiyama@gmail.com>
To: zsh-workers@zsh.org
Cc: Tomoki Sekiyama <tomoki.sekiyama@gmail.com>
Subject: [PATCH] Enable further expansion of parameter name by ${!...}
Date: Sun, 25 Jan 2015 04:15:38 -0500 [thread overview]
Message-ID: <1422177338-85472-1-git-send-email-tomoki.sekiyama@gmail.com> (raw)
With this change, ${!...} will enable further expansion of parameter name,
which is equivalent to (P) expansion flag. This will enable zsh to run some
scripts using variable references for bash. For example:
function trueorfalse {
local default=$1
local literal=$2
local testval=${!literal}
[[ -z "$testval" ]] && { echo "$default"; return; }
[[ "0 no No NO false False FALSE" =~ "$testval" ]] && { echo "False"; return; }
[[ "1 yes Yes YES true True TRUE" =~ "$testval" ]] && { echo "True"; return; }
echo "$default"
}
echo $(trueorfalse 0 SOME_VAR)
---
Doc/Zsh/expn.yo | 5 +++++
Src/subst.c | 4 ++++
2 files changed, 9 insertions(+)
diff --git a/Doc/Zsh/expn.yo b/Doc/Zsh/expn.yo
index 8728803..1029aef 100644
--- a/Doc/Zsh/expn.yo
+++ b/Doc/Zsh/expn.yo
@@ -833,6 +833,11 @@ the pattern tt(*.c), which may be expanded by filename generation, but
tt(${${~foo}//\*/*.c}) substitutes to the string tt(*.c), which will not
be further expanded.
)
+item(tt(${!)var(spec)tt(}))(
+This is equivalent to 'tt((P))' flag, which forces the value of the
+parameter var(name) to be interpreted as a further parameter name,
+whose value will be used where appropriate.
+)
enditem()
If a tt(${)...tt(}) type parameter expression or a
diff --git a/Src/subst.c b/Src/subst.c
index a2bb648..8897350 100644
--- a/Src/subst.c
+++ b/Src/subst.c
@@ -2179,6 +2179,10 @@ paramsubst(LinkList l, LinkNode n, char **str, int qt, int pf_flags)
zerr("bad substitution");
return NULL;
}
+ } else if (c == '!') {
+ /* equivalent to (P) */
+ aspar = 1;
+ s++;
} else if (inbrace && inull(*s)) {
/*
* Handles things like ${(f)"$(<file)"} by skipping
--
1.9.3 (Apple Git-50)
next reply other threads:[~2015-01-25 9:15 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-25 9:15 Tomoki Sekiyama [this message]
2015-01-25 18:14 ` Peter Stephenson
2015-01-25 18:23 ` Mikael Magnusson
2015-01-25 20:24 ` Bart Schaefer
2015-01-25 20:38 ` ZyX
2015-01-25 21:39 ` Bart Schaefer
2015-01-26 20:00 ` Tomoki Sekiyama
2015-01-26 20:44 ` ZyX
2015-01-27 5:48 ` Bart Schaefer
2015-01-28 3:21 ` Tomoki Sekiyama
2015-01-28 18:41 ` Bart Schaefer
2016-11-11 16:58 ` Bart Schaefer
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