Bash aliases/functions for parsing and viewing json

json_aliases.sh

# Pretty print json in the terminal like so:
#   $ echo "{'json': 'stuff'}" | json
alias json='python -mjson.tool'

# Parses json.  Each arg is a level deeper in the tree:
#
# Examples
# 
#   echo "{'json': {'foo': 'bar'}}" | parse_json
#   => {'json': {'foo': 'bar'}}
#
#   echo "{'foo': {'bar': 'baz'}}" | parse_json foo
#   => {'bar': 'baz'}
#
#   echo "{'foo': [{'bar': 'baz'}}]" | parse_json foo [0]
#   => {'foo': 'bar'}
#
parse_json() {
  python -c "import json,sys;print json.dumps(json.load(sys.stdin)$(__process_json_args_for_use_in_parsing "$*"))"
}


# Parses json and returns the keys as a list.
#
# Examples
# 
#   $ echo "{'json': {'foo': 'bar'}}" | parse_json_keys
#   => json
#
#   $ echo "{'foo': {'bar': 'baz'}}" | parse_json_keys foo
#   => bar
#
#   $ echo "{'foo': [{'bar': 'baz'}}]" | parse_json_keys foo [0]
#   => bar
#
parse_json_keys() {
  python -c "import json,sys;print \"\\n\".join(json.load(sys.stdin)$(__process_json_args_for_use_in_parsing "$*").keys());"
}


# Parses arguments for use with parse_json and parse_json_keys
#
# Examples
#   
#   $ __process_json_args_for_use_in_parsing foo
#   => ['foo']
#   
#   $ __process_json_args_for_use_in_parsing foo bar
#   => ['foo']['bar']
#   
#   $ __process_json_args_for_use_in_parsing foo [0] bar
#   => ['foo'][0]['bar']
#
__process_json_args_for_use_in_parsing() {
  output=''
  for var in $*; do
    if [[ $var =~ ^\[[0-9]*\]$ ]]; then
      output="$output$var"
    else
      output="$output['$var']"
    fi
  done
  printf "$output"
}