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