amiro-os / tools / bash / setuplib.sh @ 8516dad6
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################################################################################ |
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# AMiRo-OS is an operating system designed for the Autonomous Mini Robot # |
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# (AMiRo) platform. # |
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# Copyright (C) 2016..2020 Thomas Schöpping et al. # |
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# # |
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# This program is free software: you can redistribute it and/or modify # |
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# it under the terms of the GNU General Public License as published by # |
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# the Free Software Foundation, either version 3 of the License, or # |
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# (at your option) any later version. # |
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# # |
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# This program is distributed in the hope that it will be useful, # |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of # |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # |
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# GNU General Public License for more details. # |
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# # |
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# You should have received a copy of the GNU General Public License # |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. # |
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# # |
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# This research/work was supported by the Cluster of Excellence Cognitive # |
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# Interaction Technology 'CITEC' (EXC 277) at Bielefeld University, which is # |
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# funded by the German Research Foundation (DFG). # |
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################################################################################ |
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|
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### print an error message ##################################################### |
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# Prints a error <message> to standard output. |
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#If variable 'LOG_FILE' is specified, the message is also appended to the given file. |
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# |
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# usage: printError <message> |
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# arguments: <message> |
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# Message string to print. |
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# return: n/a |
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# |
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function printError { |
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local string="ERROR: $1" |
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# if a log file is specified |
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if [ -n "$LOG_FILE" ]; then |
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printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE |
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fi |
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printf "$(tput setaf 1)>>> $string$(tput sgr 0)" 1>&2 |
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} |
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|
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### print a warning message #################################################### |
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# Prints a warning <message> to standard output. |
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#If variable 'LOG_FILE' is specified, the message is also appended to the given file. |
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# |
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# usage: printMessage <message> |
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# arguments: <message> |
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# Message string to print. |
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# return: n/a |
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# |
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function printWarning { |
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local string="WARNING: $1" |
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# if a log file is specified |
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if [ -n "$LOG_FILE" ]; then |
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printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE |
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fi |
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printf "$(tput setaf 3)>>> $string$(tput sgr 0)" |
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} |
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|
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### print an information message ############################################### |
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# Prints an information <message> to standard output. |
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#If variable 'LOG_FILE' is specified, the message is also appended to the given file. |
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# |
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# usage: printInfo <message> |
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# arguments: <message> |
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# Message string to print. |
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# return: n/a |
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# |
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function printInfo { |
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local string="INFO: $1" |
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# if a log file is specified |
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if [ -n "$LOG_FILE" ]; then |
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printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE |
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fi |
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printf "$(tput setaf 2)>>> $string$(tput sgr 0)" |
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} |
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|
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### print a message to file #################################################### |
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# Appends a <message> to a log file, specified by the variable 'LOG_FILE'. |
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# |
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# usage printLog <message> |
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# arguments: <message> |
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# Message string to print. |
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# return: n/a |
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# |
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function printLog { |
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local string="LOG: $1" |
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# if a log file is specified |
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if [ -n "$LOG_FILE" ]; then |
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printf "[$(date '+%Y-%m-%d %H:%M:%S')] $string" >> $LOG_FILE |
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fi |
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} |
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|
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### exit the script normally ################################################### |
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# Prints a delimiter and exits the script normally (returns 0). |
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# |
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# usage: quitScript |
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# arguments: n/a |
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# return: 0 |
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# No error or warning occurred. |
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# |
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function quitScript { |
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printInfo "exiting $(realpath ${BASH_SOURCE[0]})\n" |
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printf "\n" |
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printf "######################################################################\n" |
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exit 0 |
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} |
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|
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### read a user input ########################################################## |
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# Reads a single character user input from a set up <options> and stores it in |
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# a given <return> variable. |
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# |
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# usage: readUserInput <options> <return> |
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# arguments: <options> |
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# String definiing the set of valid characters. |
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# If the string is empty, the user can input any character. |
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# <return> |
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# Variable to store the selected character to. |
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# return: n/a |
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# |
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function readUserInput { |
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local input="" |
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# read user input |
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while [ -z $input ] || ( [ -n "$1" ] && [[ ! $input =~ ^[$1]$ ]] ); do |
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read -p "your selection: " -n 1 -e input |
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if [ -z $input ] || ( [ -n "$1" ] && [[ ! $input =~ ^[$1]$ ]] ); then |
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printWarning "[$input] is no valid action\n" |
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fi |
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done |
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printLog "[$input] has been selected\n" |
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eval $2="$input" |
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} |
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|
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### check whether argument is an option ######################################## |
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# Checks a <string> whether it is an option. |
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# Options are defined to either start with '--' followed by any string, or |
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# to start with a single '-' followed by a single character, or |
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# to start with a single '-' followed by a single character, a '=' and any string. |
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# Examples: '--option', '--option=arg', '-o', '-o=arg', '--' |
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# |
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# usage: parseIsOption <string> |
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# arguments: <string> |
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# A string to check whether it is an option. |
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# return: 0 |
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# <string> is an option. |
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# -1 |
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# <string> is not an option. |
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# |
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function parseIsOption { |
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if [[ "$1" =~ ^-(.$|.=.*) ]] || [[ "$1" =~ ^--.* ]]; then |
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return 0 |
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else |
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return -1 |
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fi |
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} |
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|
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### set the log file ########################################################### |
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# Sets a specified <infile> as log file and checks whether it already exists. |
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# If so, the log may either be appended to the file, its content can be cleared, |
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# or no log is generated at all. |
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# The resulting path is stored in <outvar>. |
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# |
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# usage: setLogFile [--option=<option>] [--quiet] <infile> <outvar> |
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# arguments: --option=<option> |
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# Select what to do if <file> already exists. |
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# Possible values are 'a', 'c', 'r' and 'n'. |
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# - a: append (starts with a separator) |
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# - c: continue (does not insert a seperator) |
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# - r: delete and restart |
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# - n: no log |
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# If no option is secified but <file> exists, an interactive selection is provided. |
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# --quiet |
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# Suppress all messages. |
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# <infile> |
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# Path of the wanted log file. |
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# <outvar> |
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# Variable to store the path of the log file to. |
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# return: 0 |
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# No error or warning occurred. |
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# -1 |
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# Error: invalid input |
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# |
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function setLogFile { |
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local filepath="" |
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local option="" |
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local quiet=false |
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|
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# parse arguments |
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local otherargs=() |
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while [ $# -gt 0 ]; do |
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if ( parseIsOption $1 ); then |
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case "$1" in |
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-o=*|--option=*) |
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option=${1#*=}; shift 1;; |
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-o*|--option*) |
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option="$2"; shift 2;; |
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-q|--quiet) |
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quiet=true; shift 1;; |
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*) |
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printError "invalid option: $1\n"; shift 1;; |
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esac |
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else |
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otherargs+=("$1") |
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shift 1 |
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fi |
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done |
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filepath=$(realpath ${otherargs[0]}) |
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|
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# if file already exists |
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if [ -e $filepath ]; then |
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# if no option was specified, ask what to do |
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if [ -z "$option" ]; then |
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printWarning "log file $filepath already esists\n" |
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local userinput="" |
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printf "Select what to do:\n" |
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printf " [A] - append log\n" |
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printf " [R] - restart log (delete existing file)\n" |
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printf " [N] - no log\n" |
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readUserInput "AaRrNn" userinput |
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option=${userinput,,} |
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fi |
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# evaluate option |
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case "$option" in |
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a|c) |
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if [ $quiet = false ]; then |
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printInfo "appending log to $filepath\n" |
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fi |
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if [ $option != c ]; then |
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printf "\n" >> $filepath |
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printf "######################################################################\n" >> $filepath |
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printf "\n" >> $filepath |
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fi |
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;; |
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r) |
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echo -n "" > $filepath |
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if [ $quiet = false ]; then |
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printInfo "content of $filepath wiped\n" |
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fi |
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;; |
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n) |
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if [ $quiet = false ]; then |
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printInfo "no log file will be generated\n" |
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fi |
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filepath="" |
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;; |
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*) # sanity check (return error) |
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printError "unexpected argument: $option\n"; return -1;; |
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esac |
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else |
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if [ $quiet = false ]; then |
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printInfo "log file set to $filepath\n" |
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fi |
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fi |
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|
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eval ${otherargs[1]}="$filepath" |
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|
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return 0 |
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} |
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|
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### check whether commands are available ####################################### |
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# Checks whether the specified commands are available and can be executed. |
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# |
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# usage: checkCommands [<command> <command> ...] |
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# arguments: <command> |
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# Name of the command to check. |
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# return: 0 |
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# All requested commands are available. |
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# >0 |
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# Number of requested commands that were not found. |
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# -1 |
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# No argument given. |
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# |
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function checkCommands { |
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local status=0 |
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|
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# return if no argument was specified |
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if [ $# -eq 0 ]; then |
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return -1 |
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fi |
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|
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# check all specified commands |
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while [ $# -gt 0 ]; do |
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command -v $1 &>/dev/null |
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if [ $? -ne 0 ]; then |
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printWarning "Command '$1' not available.\n" |
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status=$((status + 1)) |
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fi |
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shift 1 |
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done |
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|
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return $status |
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} |