include/conf: Add simple configuration module

The "conf" module provides a simple way for scripts to store and retrieve
settings. Config files are stored per-script in $TOOLBOX_HOME/conf.

diff --git a/include/conf.sh b/include/conf.sh
new file mode 100644 (file)
index 0000000..1921cec
--- /dev/null
+++ b/include/conf.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+__init() {
+        local script_name
+
+       if ! include "log"; then
+               return 1
+       fi
+
+        script_name="${0##*/}"
+       script_name="${script_name%.*}"
+
+        if [[ -z "$script_name" ]]; then
+               log_error "Could not determine script name"
+                return 1
+        fi
+
+       declare -xgr __conf_root="$TOOLBOX_HOME/conf"
+       declare -xgr __conf_file="$__conf_root/$script_name.conf"
+
+       if ! mkdir -p "$__conf_root"; then
+               log_error "Could not create config dir"
+               return 1
+       fi
+
+       return 0
+}
+
+conf_get() {
+       local name="$1"
+       local default="$2"
+
+       if ! grep -m 1 -oP "^$name=\K.*" "$__conf_file" 2>/dev/null; then
+               if (( $# <= 1 )); then
+                       return 1
+               fi
+
+               echo "$default"
+       fi
+
+       return 0
+}
+
+conf_unset() {
+       local name="$1"
+
+       if ! sed -i -e "/^$name=.*/d" "$__conf_file" &> /dev/null; then
+               return 1
+       fi
+
+       return 0
+}
+
+
+conf_set() {
+       local name="$1"
+       local value="$2"
+
+       if conf_get "$name" &> /dev/null; then
+               if ! conf_unset "$name"; then
+                       return 1
+               fi
+       fi
+
+       if ! echo "$name=$value" > "$__conf_file"; then
+               return 1
+       fi
+
+       return 0
+}