[PATCH 4/5] config: add new functions

[Jonatan Schlag <jonatan.schlag@ipfire.org>]

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This patch add two new functions:
config_get_id_from_config()
config_get_hook_from_config

Signed-off-by: Jonatan Schlag <jonatan.schlag(a)ipfire.org>
---
 src/functions/functions.config | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/functions/functions.config b/src/functions/functions.config
index 854f490..e11a1c2 100644
--- a/src/functions/functions.config
+++ b/src/functions/functions.config
@@ -51,3 +51,23 @@ config_domainname() {
 	# the domain part.
 	print "${hostname#*.}"
 }
+
+config_get_id_from_config() {
+	# This function returns the id for a given config name
+	# Example 'dhcp.0' => 0
+	assert [ $# -eq 1 ]
+	local config=${1}
+
+	local hook=$(config_get_hook_from_config ${config})
+	echo "${config//"${hook}."/}"
+
+}
+
+config_get_hook_from_config() {
+	# This function returns the hook for a given config name
+	# Example 'dhcp.0' => dhcp
+	assert [ $# -eq 1 ]
+	local config=${1}
+
+	echo "${config//.*[[:digit:]]/}"
+}
-- 
2.6.3