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Scott Duensing
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towel.sh
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towel.sh
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#!/bin/bash -e
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#
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# Towel: Randomly Useful Bash Functions
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# Never Leave Home Without Your Towel
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#
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# Copyright (C) 2019 Scott Duensing <scott@kangaroopunch.com>
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#
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# This software is provided 'as-is', without any express or implied
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# warranty. In no event will the authors be held liable for any damages
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# arising from the use of this software.
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#
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# Permission is granted to anyone to use this software for any purpose,
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# including commercial applications, and to alter it and redistribute it
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# freely, subject to the following restrictions:
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#
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# 1. The origin of this software must not be misrepresented; you must not
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# claim that you wrote the original software. If you use this software
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# in a product, an acknowledgment in the product documentation would be
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# appreciated but is not required.
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# 2. Altered source versions must be plainly marked as such, and must not be
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# misrepresented as being the original software.
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# 3. This notice may not be removed or altered from any source distribution.
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#
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#
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# Escapes a given string so it's safe to write into an XML document.
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#
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# Parameters:
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#
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# RESULT - Variable in which to return the escaped string.
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# VAR - String to escape.
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#
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function tEscapeXml() {
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local __RESULT=$1
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local __VAR=${*:2}
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__VAR=$(echo ${__VAR} | sed -e 's~&~\&~g' -e 's~<~\<~g' -e 's~>~\>~g')
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eval $__RESULT=\${__VAR}
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}
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#
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# Displays a whiptail-based file browser for selecting a particular type of file.
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#
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# Parameters:
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#
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# RESULT - Variable in which to store selected filename, or empty if dialog is canceled.
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# TITLE - Title to display in the file browser window.
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# EXTENSION - The extension to allow to be selected (in ".ext" format).
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# START - Optional. Path to begin browsing from.
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#
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function tFileBrowser() {
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local __RESULT=$1
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local __TITLE=$2
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local __EXTENSION=$3
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local __START=$4
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local __SELECTION=
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local __DIRLIST=()
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local __CURDIR=
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local __RET=
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local __LOOPING=1
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pushd . > /dev/null
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if [[ ! -z ${__START} ]]; then
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cd "${__START}"
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fi
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while [[ ${__LOOPING} -eq 1 ]]; do
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__DIRLIST=()
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if [[ "${__CURDIR}" != "/" ]]; then
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__DIRLIST[${#__DIRLIST[@]}+1]=".."
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__DIRLIST[${#__DIRLIST[@]}+1]="Up"
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fi
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for F in *; do
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if [[ -d "${F}" ]]; then
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__DIRLIST[${#__DIRLIST[@]}+1]=$(echo "${F}/ ")
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else
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__DIRLIST[${#__DIRLIST[@]}+1]=$(echo "${F} ")
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fi
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__DIRLIST[${#__DIRLIST[@]}+1]=$(ls -lah "${F}" | awk '{ print $5 }')
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done
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__CURDIR=$(pwd)
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__SELECTION=$(whiptail --title "${__TITLE}" \
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--menu "PgUp/PgDn/Arrows ENTER Selects File/Folder\nor TAB Key\n\n${__CURDIR}" 0 0 0 \
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--cancel-button "Cancel" \
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--ok-button "Select" "${__DIRLIST[@]}" 3>&1 1>&2 2>&3)
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__RET=$?
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if [[ ${__RET} -eq 1 ]]; then
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# User Selected Cancel
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__SELECTION=
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__LOOPING=0
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elif [[ ${__RET} -eq 0 ]]; then
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tTrim __SELECTION "${__SELECTION}"
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if [[ -d "${__SELECTION}" ]]; then
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# Was a directory selected?
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cd "${__SELECTION}"
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elif [[ -f "${__SELECTION}" ]]; then
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# Was a file selected?
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if [[ ${__SELECTION} == *${__EXTENSION} ]]; then
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# Check if file has given extension
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if (whiptail --title "Confirm Selection" \
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--yesno "Directory: ${__CURDIR}\n Filename: ${__SELECTION}" 0 0 \
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--yes-button "Confirm" \
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--no-button "Reselect"); then
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__SELECTION="$(pwd)/${__SELECTION}"
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__LOOPING=0
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fi
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else
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# Not requested extension
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whiptail --title "Error" \
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--msgbox "Not a ${__EXTENSION} file" 0 0
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fi
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else
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# Not a file or folder
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whiptail --title "Error" \
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--msgbox "Unable to change to directory ${__SELECTION}" 0 0
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fi
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fi
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done
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eval $__RESULT=\${__SELECTION}
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popd > /dev/null
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}
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#
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# Returns the absolute path of a given file.
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#
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# Parameters:
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#
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# RESULT - Variable in which to return the absolute path.
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# SOURCE - File which we wish to find the absolute path.
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#
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function tFindPath() {
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local __RESULT=$1
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local __SOURCE=$2
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local __DIR=
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while [[ -h "${__SOURCE}" ]]; do
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__DIR="$( cd -P "$( dirname "${__SOURCE}" )" && pwd )"
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__SOURCE="$(readlink "${__SOURCE}")"
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# If $__SOURCE was a relative symlink, we need to resolve it
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# relative to the path where the symlink file was located.
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[[ ${__SOURCE} != /* ]] && __SOURCE="${__DIR}/${__SOURCE}"
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done
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__DIR="$( cd -P "$( dirname "${__SOURCE}" )" && pwd )"
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eval $__RESULT=\${__DIR}
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}
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#
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# Returns the location and name of the parent script that included us.
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#
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# Parameters:
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#
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# RESULT - Variable in which we want the absolute filename returned.
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#
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function tGetParentPath() {
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local __RESULT=$1
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local __PARENTPATH=
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tFindPath __PARENTPATH "${BASH_SOURCE[1]}"
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__TOWELPATH="${__PARENTPATH}/`basename \"${BASH_SOURCE[1]}\"`"
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eval $__RESULT=\${__PARENTPATH}
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}
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#
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# Returns the location and name of this Towel script.
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#
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# Parameters:
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#
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# RESULT - Variable in which we want the absolute filename returned.
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#
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function tGetTowelPath() {
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local __RESULT=$1
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local __TOWELPATH=
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tFindPath __TOWELPATH "${BASH_SOURCE[0]}"
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__TOWELPATH="${__TOWELPATH}/`basename \"${BASH_SOURCE[0]}\"`"
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eval $__RESULT=\${__TOWELPATH}
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}
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#
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# Removes whitespace from the beginning and end of a string.
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#
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# Parameters:
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#
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# RESULT - Variable in which to return the trimmed string.
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# VAR - String to trim.
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#
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function tTrim() {
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local __RESULT=$1
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local __VAR="${*:2}"
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# remove leading whitespace characters
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__VAR="${__VAR#"${__VAR%%[![:space:]]*}"}"
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# remove trailing whitespace characters
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__VAR="${__VAR%"${__VAR##*[![:space:]]}"}"
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eval $__RESULT=\${__VAR}
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}
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#
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# We're a library. Don't run us.
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#
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if [ -z "${BASH_SOURCE[1]}" ]; then
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echo "This is a library. Include it into other scripts. Don't execute it."
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exit 0
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fi
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