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switch.sh
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switch.sh
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#!/bin/bash
#
# Copyright © 2016 Zetok Zalbavar <[email protected]>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
set -eu -o pipefail
# get the first line from provided file
first_line() {
head -n1 "$@"
}
# create new line, "opposite" to what it was from provided file
newline() {
local old=( $(first_line "$@") )
local state="${old[3]}"
local new="${old[0]} ${old[1]} ${old[2]}"
if [[ $state = "merging" ]]
then
new="${new} testing"
else
new="${new} merging"
fi
echo $new
}
# get all the lins except the first one from provided file
other_lines() {
tail -n +2 "$@"
}
change() {
local file="README.md"
local header=$(newline $file)
local rest=$(other_lines $file)
echo "$header" > "$file"
echo "$rest" >> "$file"
}
change