allow updates

closes #3

README.md

@@ -39,6 +39,19 @@ Goto scripts directory and launch [example.sh](https://github.com/albfan/bash-in
 
 Inspect its code, reuse on your scripts
 
+### Updating and saving changes
+
+To update a value
+
+    var=new_value
+    cfg_update <sec> <var>
+
+To save changes
+
+    cfg_writer > newfile.ini
+
+> Take care that saving function will loose comments and indentation, use with care
+
 ### Checking a ini file
 
 If you want to test your existing ini file use [getkeyfromsection.sh](https://github.com/albfan/bash-ini-parser/blob/master/scripts/getkeyfromsection.sh)

bash-ini-parser

@@ -58,36 +58,63 @@ function cfg_parser {
 }
 
 function cfg_writer {
+   OLDIFS="$IFS"
    IFS=' '$'\n'
    fun="$(declare -F)"
    fun="${fun//declare -f/}"
    for f in $fun; do
       [ "${f#$PREFIX}" == "${f}" ] && continue
       item="$(declare -f ${f})"
-      item="${item##*\{}"
-      item="${item/\}}"
-      item="${item%)*}"
-      item="${item});"
+      item="${item##*\{}" # remove function definition
+      item="${item/\}}"  # remove function close
+      item="${item%)*}" # remove everything after parenthesis
+      item="${item});" # add close parenthesis
       vars=""
       while [ "$item" != "" ]
       do
-         newvar="${item%%=*}"
-         vars="$vars $newvar"
-         item="${item#*;}"
+         newvar="${item%%=*}" # get item name
+         vars="$vars $newvar" # add name to collection
+         item="${item#*;}" # remove readed line
       done
       eval $f
-      echo "[${f#$PREFIX}]"
+      echo "[${f#$PREFIX}]" # output section
       for var in $vars; do
-         eval 'local length=${#'$var'[*]}'
+         eval 'local length=${#'$var'[*]}' # test if var is an array
          if [ $length == 1 ]
          then
-            echo $var=\"${!var}\"
+            echo $var=\"${!var}\" #output var
          else 
-            echo ";$var is an array"
-            eval 'echo $var=\"${'$var'[*]}\"'
+            echo ";$var is an array" # add comment denoting var is an array
+            eval 'echo $var=\"${'$var'[*]}\"' # output array var
          fi
       done
    done
+   IFS="$OLDIFS"
 }
 
+function cfg_update {
+   SECTION=$1
+   VAR=$2
+   OLDIFS="$IFS"
+   IFS=' '$'\n'
+   fun="$(declare -F $PREFIX$SECTION)"
+   if [ -z $fun ]
+   then
+      echo "section $SECTION not found" >2
+      exit 1
+   fi
+   fun="${fun//declare -f/}"
+   item="$(declare -f ${fun})"
+   #item="${item##* $VAR=*}" # remove var declaration
+   item="${item/\}}"  # remove function close
+   item="${item}
+    $VAR=(${!VAR})
+   "
+   item="${item}
+   }" # close function again
+   
+   eval "function $item" 
+}
+
+
 # vim: filetype=sh

scripts/example.sh

@@ -32,3 +32,21 @@ echo enable section \'sec1\'
 cfg_section_sec1
 
 echo "var2 value is \"$var2\""
+
+echo
+echo update values:
+echo
+
+echo update sec1.var1 to \"foobar\"
+var1="foobar"
+cfg_update sec1 var1
+echo update sec2.var1 to \"barfoo\"
+var1="barfoo"
+cfg_update sec2 var1
+
+# note you don't need to load section to update it
+cfg_section_sec1
+echo sec1.var1 value is \"$var1\"
+
+cfg_section_sec2
+echo sec2.var1 value is \"$var1\"