bin/utils.inc
# bash utils from angularjs NOTE:(martin) replaceJsonProp and replaceInFile are modified from original angularJS version.
# This file provides:
# - a default control flow
# * initializes the environment
# * able to mock "git push" in your script and in all sub scripts
# * call a function in your script based on the arguments
# - named argument parsing and automatic generation of the "usage" for your script
# - intercepting "git push" in your script and all sub scripts
# - utility functions
#
# Usage:
# - define the variable ARGS_DEF (see below) with the arguments for your script
# - include this file using `source utils.inc` at the end of your script.
#
# Default control flow:
# 0. Set the current directory to the directory of the script. By this
# the script can be called from anywhere.
# 1. Parse the named arguments
# 2. If the parameter "git_push_dryrun" is set, all calls to `git push` in this script
# or in child scripts will be intercepted so that the `--dry-run` and `--porcelain` is added
# to show what the push would do but not actually do it.
# 3. If the parameter "verbose" is set, the `-x` flag will be set in bash.
# 4. The function "init" will be called if it exists
# 5. If the parameter "action" is set, it will call the function with the name of that parameter.
# Otherwise the function "run" will be called.
#
# Named Argument Parsing:
# - The variable ARGS_DEF defines the valid command arguments
# * Required args syntax: --paramName=paramRegex
# * Optional args syntax: [--paramName=paramRegex]
# * e.g. ARG_DEFS=("--required_param=(.+)" "[--optional_param=(.+)]")
# - Checks that:
# * all arguments match to an entry in ARGS_DEF
# * all required arguments are present
# * all arguments match their regex
# - Afterwards, every parameter value will be stored in a variable
# with the name of the parameter in upper case (with dash converted to underscore).
#
# Special arguments that are always available:
# - "--action=.*": This parameter will be used to execute a function with that name when the
# script is started
# - "--git_push_dryrun=true": This will intercept all calls to `git push` in this script
# or in child scripts so that the `--dry-run` and `--porcelain` is added
# to show what the push would do but not actually do it.
# - "--verbose=true": This will set the `-x` flag in bash so that all calls will be logged
#
# Utility functions:
# - readJsonProp
# - replaceJsonProp
# - resolveDir
# - getVar
# - serVar
# - isFunction
# always stop on errors
set -e
function usage {
echo "Usage: ${0} ${ARG_DEFS[@]}"
exit 1
}
function parseArgs {
local REQUIRED_ARG_NAMES=()
# -- helper functions
function varName {
# everything to upper case and dash to underscore
echo ${1//-/_} | tr '[:lower:]' '[:upper:]'
}
function readArgDefs {
local ARG_DEF
local AD_OPTIONAL
local AD_NAME
local AD_RE
# -- helper functions
function parseArgDef {
local ARG_DEF_REGEX="(\[?)--([^=]+)=(.*)"
if [[ ! $1 =~ $ARG_DEF_REGEX ]]; then
echo "Internal error: arg def has wrong format: $ARG_DEF"
exit 1
fi
AD_OPTIONAL="${BASH_REMATCH[1]}"
AD_NAME="${BASH_REMATCH[2]}"
AD_RE="${BASH_REMATCH[3]}"
if [[ $AD_OPTIONAL ]]; then
# Remove last bracket for optional args.
# Can't put this into the ARG_DEF_REGEX somehow...
AD_RE=${AD_RE%?}
fi
}
# -- run
for ARG_DEF in "${ARG_DEFS[@]}"
do
parseArgDef $ARG_DEF
local AD_NAME_UPPER=$(varName $AD_NAME)
setVar "${AD_NAME_UPPER}_OPTIONAL" "$AD_OPTIONAL"
setVar "${AD_NAME_UPPER}_RE" "$AD_RE"
if [[ ! $AD_OPTIONAL ]]; then
REQUIRED_ARG_NAMES+=($AD_NAME)
fi
done
}
function readAndValidateArgs {
local ARG_NAME
local ARG_VALUE
local ARG_NAME_UPPER
# -- helper functions
function parseArg {
local ARG_REGEX="--([^=]+)=?(.*)"
if [[ ! $1 =~ $ARG_REGEX ]]; then
echo "Can't parse argument $i"
usage
fi
ARG_NAME="${BASH_REMATCH[1]}"
ARG_VALUE="${BASH_REMATCH[2]}"
ARG_NAME_UPPER=$(varName $ARG_NAME)
}
function validateArg {
local AD_RE=$(getVar ${ARG_NAME_UPPER}_RE)
if [[ ! $AD_RE ]]; then
echo "Unknown option: $ARG_NAME"
usage
fi
if [[ ! $ARG_VALUE =~ ^${AD_RE}$ ]]; then
echo "Wrong format: $ARG_NAME"
usage;
fi
# validate that the "action" option points to a valid function
if [[ $ARG_NAME == "action" ]] && ! isFunction $ARG_VALUE; then
echo "No action $ARG_VALUE defined in this script"
usage;
fi
}
# -- run
for i in "$@"
do
parseArg $i
validateArg
setVar "${ARG_NAME_UPPER}" "$ARG_VALUE"
done
}
function checkMissingArgs {
local ARG_NAME
for ARG_NAME in "${REQUIRED_ARG_NAMES[@]}"
do
ARG_VALUE=$(getVar $(varName $ARG_NAME))
if [[ ! $ARG_VALUE ]]; then
echo "Missing: $ARG_NAME"
usage;
fi
done
}
# -- run
readArgDefs
readAndValidateArgs "$@"
checkMissingArgs
}
# getVar(varName)
function getVar {
echo ${!1}
}
# setVar(varName, varValue)
function setVar {
eval "$1=\"$2\""
}
# isFunction(name)
# - to be used in an if, so return 0 if successful and 1 if not!
function isFunction {
if [[ $(type -t $1) == "function" ]]; then
return 0
else
return 1
fi
}
# readJsonProp(jsonFile, property)
# - restriction: property needs to be on a single line!
function readJsonProp {
echo $(sed -En 's/.*"'$2'"[ ]*:[ ]*"(.*)".*/\1/p' $1)
}
# replaceJsonProp(jsonFile, property, newValue)
# - note: propertyRegex will be automatically placed into a
# capturing group! -> all other groups start at index 2!
function replaceJsonProp {
replaceInFile $1 "\"$2\": \".*?\"" "\"$2\": \"$3\""
}
# replaceInFile(file, findPattern, replacePattern)
function replaceInFile {
perl -pi -e "s/$2/$3/g;" $1
}
# resolveDir(relativeDir)
# - resolves a directory relative to the current script
function resolveDir {
echo $(cd $SCRIPT_DIR; cd $1; pwd)
}
function git_push_dryrun_proxy {
echo "## git push dryrun proxy enabled!"
export ORIGIN_GIT=$(which git)
function git {
local ARGS=("$@")
local RC
if [[ $1 == "push" ]]; then
ARGS+=("--dry-run" "--porcelain")
echo "####### START GIT PUSH DRYRUN #######"
echo "${ARGS[@]}"
fi
if [[ $1 == "commit" ]]; then
echo "${ARGS[@]}"
fi
$ORIGIN_GIT "${ARGS[@]}"
RC=$?
if [[ $1 == "push" ]]; then
echo "####### END GIT PUSH DRYRUN #######"
fi
return $RC
}
export -f git
}
function main {
# normalize the working dir to the directory of the script
cd $(dirname $0);SCRIPT_DIR=$(pwd)
ARG_DEFS+=("[--git-push-dryrun=(true|false)]" "[--verbose=(true|false)]")
parseArgs "$@"
# --git_push_dryrun argument
if [[ $GIT_PUSH_DRYRUN == "true" ]]; then
git_push_dryrun_proxy
fi
# --verbose argument
if [[ $VERBOSE == "true" ]]; then
set -x
fi
if isFunction init; then
init "$@"
fi
# jump to the function denoted by the --action argument,
# otherwise call the "run" function
if [[ $ACTION ]]; then
$ACTION "$@"
else
run "$@"
fi
}
main "$@"