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Brent Woodruff
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Merge pull request #47 from fprimex/bww-epath
Add app_epath.sh, a POSIX app.config parsing utility.
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‎priv/base/app_epath.sh‎

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#!/bin/sh
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## ---------------------------------------------------------------------
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##
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## app_epath.sh: Parse Erlang app.config with POSIX tools for automation
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##
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## Copyright (c) 2013 Basho Technologies, Inc. All Rights Reserved.
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##
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## This file is provided to you under the Apache License,
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## Version 2.0 (the "License"); you may not use this file
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## except in compliance with the License. You may obtain
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## a copy of the License at
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##
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## http://www.apache.org/licenses/LICENSE-2.0
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##
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## Unless required by applicable law or agreed to in writing,
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## software distributed under the License is distributed on an
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## "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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## KIND, either express or implied. See the License for the
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## specific language governing permissions and limitations
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## under the License.
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##
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## ---------------------------------------------------------------------
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## Example usage:
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#
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# #!/bin/sh
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#
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# # Load the functions
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# . path/to/app_epath.sh
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#
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# # Build the path info
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# epaths=`make_app_epaths path/to/app.config`
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#
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# # View all of the settings. Quotes are important.
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# echo "$epaths"
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#
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# # Grep around in the paths for various items.
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# echo "$epaths" | grep 'riak_core ring_creation_size'
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# echo "$epaths" | grep "lager handlers lager_file_backend" | grep info
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#
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# # Use the epath function to get directly at settings
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# epath 'riak_core ring_creation_size' "$epaths"
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# epath 'riak_core platform_bin_dir' "$epaths"
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# epath 'riak_kv storage_backend' "$epaths"
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#
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# # Use epath to view all of the riak_core settings
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# epath riak_core
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#
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## End example
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## Here is a command you can put in your path for general cli use.
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#
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# #!/bin/sh
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#
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# # $1 quoted eterm path for search: 'riak_core ring_creation_size'
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# # $2 path/to/app.config
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#
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# . path/to/app_epath.sh
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#
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# epaths=`make_app_epaths "$2"`
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# epath "$1" "$epaths"
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#
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## End epath command
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# make_app_epaths takes a path to an app.config file as its argument and
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# and returns (prints) a flattened text structure of configuration settings.
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make_app_epaths () {
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# Remove all lines containing comments
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# Remove all blank lines
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# Remove the first [
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# Remove the last ].
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# Remove all blank lines again (just in case)
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appconfig=`cat $1 \
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| sed '/^[ \t]*%/d' \
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| sed '/^[ \t]*$/d' \
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| sed -e '/\[/{s///;:a' -e '$!N;$!ba' -e '}' \
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| sed '$ s/\]\.//g' \
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| sed '/^[ \t]*$/d'`
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STACK=
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INQUOTE=0
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# The awk puts each char, spaces included, on their own line for parsing.
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echo "$appconfig" | awk '{gsub(//,"\n");print}' | while read i; do
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case "x${i}x" in
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"x\"x")
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# Flip the INQUOTE state and echo the quote
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if [ 1 -eq $INQUOTE ]; then
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INQUOTE=0
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else
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INQUOTE=1
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fi
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STACK="${STACK}${i}"
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;;
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"xx")
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if [ 1 -eq $INQUOTE ]; then
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# If in quotes, keep this space
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STACK="${STACK} "
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fi
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;;
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"x,x")
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if [ 1 -eq $INQUOTE ]; then
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# If in quotes, keep this comma
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STACK="${STACK},"
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else
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# Commas outside quotes means a new item is next
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STACK="${STACK} "
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fi
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;;
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"x{x")
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if [ 1 -eq $INQUOTE ]; then
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# If in quotes, keep this bracket
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STACK="${STACK}{"
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else
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# Add brace to the stack; will pop off from here on next }
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STACK="${STACK} __EBRACE__ "
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fi
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;;
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"x}x")
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if [ 1 -eq $INQUOTE ]; then
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# If in quotes, keep this bracket
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STACK="${STACK}}"
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else
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# We're only interested in printing leaves, not
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# intermediates like 'riak_core http', which contain lists.
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# See if the current stack ends with ] (end of list).
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echo $STACK | grep -E "__EBRACKET__$" >/dev/null 2>&1
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if [ 1 -eq $? ]; then
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# If not, print the stack without all of the mess.
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echo "$STACK" | \
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sed 's/ *__EBRACE__//g;s/ *__EBRACKET__//g;s/^ *//'
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fi
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# Pop off everything from the last brace on.
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STACK=`echo "$STACK" | sed 's/\(.*\) __EBRACE__.*/\1/g'`
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fi
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;;
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"x[x")
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if [ 1 -eq $INQUOTE ]; then
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# If in quotes, keep this bracket
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STACK="${STACK}["
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else
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# Add a placeholder to aid in determining whether or not to
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# print. That is, we don't want to print 'riak_core http'.
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STACK="${STACK} __EBRACKET__ "
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fi
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;;
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"x]x")
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if [ 1 -eq $INQUOTE ]; then
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# If in quotes, keep this bracket
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STACK="${STACK}]"
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fi
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# Don't actually do anything with ], as the starting brackets
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# are instead removed with }.
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;;
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*)
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# Anything else is just pushed.
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STACK="${STACK}${i}"
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;;
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esac
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done
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}
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epath () {
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# arg1 - a pattern to search for
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# arg2 - output of make_app_epaths, passed in quoted
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# output - search of arg2 for arg1, trimming arg1 from the beginning
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# Note: there may be multiple lines of output.
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pat=$1
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shift
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echo "$*" | grep "$pat " | sed "s/^${pat} *//"
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}
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