started working on config loader

lib/utils/config.sh

@@ -0,0 +1,97 @@
+#!/bin/sh
+
+__CFG_REPORTERS=
+__CFG_METRICS=
+
+get_configured_reporters () {
+  echo $__CFG_REPORTERS
+}
+
+get_configured_metrics () {
+  echo $__CFG_METRICS
+}
+
+parse_config () {
+  if [ ! -f "$1" ]; then
+    echo "Error: unable to load config file: ${1}"
+    return 1
+  fi
+
+  RESTORE_IFS=$IFS
+  # dash compatibility :-(
+  IFS=$'
+'
+
+  local _group
+  local _name
+  local _alias
+  local _body
+
+  end_section () {
+    if [ -z "$_group" ]; then
+      return
+    fi
+
+    local fn_name
+    if [ "$_group" = "reporter" ]; then
+      __CFG_REPORTERS=$(trim "${__CFG_REPORTERS} ${_name}:${_alias}")
+      fn_name="__r_"
+    elif [ "$_group" = "metric" ]; then
+      __CFG_METRICS=$(trim "${__CFG_METRICS} ${_name}:${_alias}")
+      fn_name="__m_"
+    else
+      fn_name="global"
+    fi
+
+    if [ -n "$_alias" ]; then
+      fn_name="${fn_name}${_alias}"
+    elif [ -n "$_name" ]; then
+      fn_name="${fn_name}${_name}"
+    fi
+
+    if [ -z "$_body" ]; then
+      return
+    fi
+
+    #echo "${fn_name}_config () { ${_body}; }"
+    eval "${fn_name}_config () { ${_body}; }"
+  }
+
+  for line in $(cat $1); do
+    # handle comments / empty lines
+    line=$(echo $line | grep -v '^\(#\|;\)')
+
+    if [ -z "$line" ]; then
+      continue
+    fi
+
+    local _section=$(echo $line | grep '^\[.*' | sed 's/\[\(.*\)\]/\1/')
+    if [ -n "$_section" ]; then
+      end_section
+      unset _group _name _alias _body
+
+      _group=$(echo $_section | awk '{ print $1 }')
+
+      if echo " metrics.sh metric reporter " | grep -q -v " $_group "; then
+        echo "Warning: unknown section in configuration file: $_section"
+        continue
+      fi
+
+      if [ "$_group" = "metrics.sh" ]; then
+        _group="global"
+        continue
+      fi
+
+      _section=$(echo $_section | awk '{ print $2 }')
+      _name=$(echo $_section | awk 'BEGIN { FS=":" } { print $1 } ')
+      _alias=$(echo $_section | awk 'BEGIN { FS=":" } { print $2 } ')
+      continue
+    fi
+
+    _body=$(echo "${_body};${line}" | sed 's/^;//g')
+  done
+
+  end_section
+
+  IFS=$RESTORE_IFS
+}