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base-files: functions.sh: Add prepend() homologue to append()

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Sometimes it's useful to be able to prepend to a variable as
well, such as when dealing with domain names, e.g.

    prepend fdqn "$subdomain" "."

will result in:

   fqdn="$subdomain.$fqdn"

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
This commit is contained in:
Philip Prindeville 2023-09-24 11:52:19 -06:00 committed by Paul Spooren
parent b23c2ec831
commit 1998027d7c
1 changed files with 8 additions and 0 deletions
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package/base-files/files/lib/functions.sh
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@ -40,6 +40,14 @@ append() {
eval "export ${NO_EXPORT:+-n} -- \"$var=\${$var:+\${$var}\${value:+\$sep}}\$value\"" eval "export ${NO_EXPORT:+-n} -- \"$var=\${$var:+\${$var}\${value:+\$sep}}\$value\""
} }
prepend() {
local var="$1"
local value="$2"
local sep="${3:- }"
eval "export ${NO_EXPORT:+-n} -- \"$var=\${$value:+\${$value}\$sep}\$var\""
}
list_contains() { list_contains() {
local var="$1" local var="$1"
local str="$2" local str="$2"