92 lines
3.1 KiB
Bash
Executable File
92 lines
3.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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# line-launcher - presents a selection of prebuilt commands from
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# a file, then runs the selected option.
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# Copyright (C) 2024 JT Anderson jtanderson@jtopia.org
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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 <https://www.gnu.org/licenses/>.
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line-launcher () {
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# Stash the value of the IFS variable for later
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# restoration.
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XIFS=$IFS
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# This is the file with your pre-built commands.
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linefile=$HOME/.config/launchlines
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# Convert the file to an array we can use in the
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# script.
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mapfile -t array < $linefile
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# Usage and warning.
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echo -e "line-launcher runs your choice of line from $linefile\nThere is no error checking, the contents of that file are your responsibility.\n\n\tPlease choose from the following:"
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# setting IFS here because otherwise the for loop
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# will evaluate each space-separated word as an
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# individual component to loop through. Setting
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# IFS to 'newline' makes the for loop split whole
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# lines instead.
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IFS=$'\n'
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# The iterator which we will be incrementing.
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selector=1
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# The loop that builds the display.
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for c in ${array[@]}:
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do
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# An if statement could be added here that
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# wouid skip over lines in the file that
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# are blank or contain the word placeholder
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# so that if an item is removed, it does not
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# have to change the selector options for
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# lines farther down the file. I.e., if you
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# remove the 3rd line, then all later options
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# will move up, ruining muscle memory. By
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# excluding blank lines from being displayed,
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# but still incrementing the counter, later
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# items will keep their numbering.
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# Wrap both of these lines in the above if
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# statement, if you decide to add that.
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# Output the choice to the screen
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echo -e "\t\t$selector\t$c"
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# Increment the selector
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let selector++
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# Repeat until entire file has been displayed
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done
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# Restore the IFS variable after finishing the loop.
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IFS=$XIFS
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# Get input from the user to select the line to run.
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# "Evaluates true" if the input is a number or letter 'q'.
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unset number
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until [[ $number == +([0-9]) ]] || [[ $number == "q" ]];
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do
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read -r -p "please enter a number (or 'q' to quit): " number
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done
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# Finally, read the selected line from the file and execute it.
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# Awk probably could have done all of this, if I were an actual wizard.
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awk -v sel="$number" 'NR == sel { system($0); exit }' $linefile
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# function ends here
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}
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# If the file is being sourced, do nothing, else run the function.
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# This allows you to include the file in your .bashrc,
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# or run it directly.
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if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then line-launcher; fi
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