First implementation

README.md

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+## bash-ini-parser
+
+A ini file parser for bash relying only on builtins
+
+### Using
+
+You must copy bash-ini-parser on your project and source it
+
+    $ source bash-ini-parser
+
+or
+
+    $ . source bash-ini-parser
+
+It will declare functions per section called cfg.section.<section> with variable declaration inside so you can access its values using
+
+    $ cfg.section.<section>
+    $ echo $var
+
+### test it
+
+Goto test directory and launch test.sh
+
+    $ cd test
+    $ ./test.sh
+
+Inspect its code, reuse on your scripts
+
+If you want to test your existing ini file use testfile.sh
+
+    $ testfile.sh &gt;customfile.ini&lt; sectionname varname
+
+e.g.:
+
+    $ ./testfile.sh file.ini sec1 var4
+    show parsed file.ini
+    [sec1]
+    var1="foo"
+    var2="hoge"
+    var3="fuga"
+    var4="pivo"
+    [sec2]
+    var1="bar"
+    var2="foo"
+    var3="eco"
+    var4="piyo baz qux"
+    var5="foo"
+    var6="hoge"
+
+    var4 value is "pivo"
+    
+### Drawbacks
+
+This is more a hack than a reliable parser, so keep in mind things like
+
+ - multiword value vars will be arrays so you must access it as `${var[*]}`
+ - changing from section to section will not erase previous var declarations
+
+For a trusted parser (but based on python) checkout [crudini](https://github.com/pixelb/crudini)
+
+### Credits
+
+This is just an enhacement from http://theoldschooldevops.com/2008/02/09/bash-ini-parser

bash-ini-parser

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+#
+# based on http://theoldschooldevops.com/2008/02/09/bash-ini-parser/
+#
+
+function debug {
+   return #abort debug
+   echo $*
+   echo "${ini[*]}"
+   echo
+}
+
+function cfg_parser {
+   ini="$(<$1)"                # read the file
+   ini="${ini//[/\\[}"          # escape [
+   debug
+   ini="${ini//]/\\]}"          # escape ]
+   debug
+   IFS=$'\n' && ini=( ${ini} ) # convert to line-array
+   debug
+   ini=( ${ini[*]//;*/} )      # remove comments with ;
+   debug
+   ini=( ${ini[*]/	=/=} )  # remove tabs before =
+   debug
+   ini=( ${ini[*]/#	/} )  # remove init tabs #TODO: remove all not just one
+   debug
+   ini=( ${ini[*]/# /} )  # remove init space #TODO: remove all not just one
+   debug
+   ini=( ${ini[*]/=	/=} )   # remove tabs after =
+   debug
+   ini=( ${ini[*]/ = /=} )   # remove anything with a space around =
+   debug
+   ini=( ${ini[*]/#\\[/\}$'\n'cfg.section.} ) # set section prefix
+   debug
+   ini=( ${ini[*]/%\\]/ \(} )    # convert text2function (1)
+   debug
+   ini=( ${ini[*]/=/=\( } )    # convert item to array
+   debug
+   ini=( ${ini[*]/%/ \)} )     # close array parenthesis
+   debug
+   ini=( ${ini[*]/%\\ \)/ \\} ) # the multiline trick
+   debug
+   ini=( ${ini[*]/%\( \)/\(\) \{} ) # convert text2function (2)
+   debug
+   ini=( ${ini[*]/%\} \)/\}} ) # remove extra parenthesis
+   debug
+   ini[0]="" # remove first element
+   debug
+   ini[${#ini[*]} + 1]='}'    # add the last brace
+   debug
+   eval "$(echo "${ini[*]}")" # eval the result
+}
+
+function cfg_writer {
+   IFS=' '$'\n'
+   fun="$(declare -F)"
+   fun="${fun//declare -f/}"
+   for f in $fun; do
+      [ "${f#cfg.section}" == "${f}" ] && continue
+      item="$(declare -f ${f})"
+      item="${item##*\{}"
+      item="${item/\}}"
+      item="${item%)*}"
+      item="${item});"
+      vars=""
+      while [ "$item" != "" ]
+      do
+         newvar="${item%%=*}"
+         vars="$vars $newvar"
+         item="${item#*;}"
+      done
+      eval $f
+      echo "[${f#cfg.section.}]"
+      for var in $vars; do
+         eval 'local length=${#'$var'[*]}'
+         if [ $length == 1 ]
+         then
+            echo $var=\"${!var}\"
+         else 
+            echo ";$var is an array"
+            eval 'echo $var=\"${'$var'[*]}\"'
+         fi
+      done
+   done
+}
+
+# vim: filetype=sh

test/file.ini

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+;seccion one: clean whitespace
+[sec1]
+	var1=foo
+	var2	=hoge
+	var3 = fuga
+		var4=	pivo   
+[sec2]
+;this is the variable we want
+var1=bar
+var2=foo
+var3=eco
+;this is a multiword value
+var4="piyo baz qux"
+;this is an array
+var5=foo bar baz hoge
+var6=hoge
+

test/test.sh

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+#!/bin/bash
+
+source ../bash-ini-parser
+
+TEST_FILE="file.ini"
+# parse the config file called 'myfile.ini'
+cfg_parser "$TEST_FILE"
+
+# show parsed ini file
+echo show file parsed
+cfg_writer
+echo
+
+echo show some results
+# enable section called 'sec2' (in the file [sec2]) for reading
+cfg.section.sec2
+
+# read the content of the variable called 'var2' (in the file
+# var2=XXX). If your var2 is an array, then you can use
+# ${var[index]}
+echo "var2 value is \"$var2\""
+echo "var5[1] value is \"${var5[1]}"\"
+echo "var5[*] value is \"${var5[*]}"\"
+echo "var4 value is \"$var4"\"
+

test/testfile.sh

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+#!/bin/bash
+
+source ../bash-ini-parser
+
+TEST_FILE="$1"
+TEST_SECTION="$2"
+TEST_VALUE="$3"
+
+# parse the config file
+cfg_parser "$TEST_FILE"
+
+# show parsed ini file
+echo show parsed $TEST_FILE
+cfg_writer
+echo
+
+# enable section selected
+cfg.section.$TEST_SECTION
+
+# show value of section selected
+echo "$TEST_VALUE value is \"${!TEST_VALUE}\""
+