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progress_bar.sh
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progress_bar.sh
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#!/bin/bash
# https://github.com/pollev/bash_progress_bar - See license at end of file
# Usage:
# Source this script
# enable_trapping <- optional to clean up properly if user presses ctrl-c
# setup_scroll_area <- create empty progress bar
# draw_progress_bar 10 <- advance progress bar
# draw_progress_bar 40 <- advance progress bar
# block_progress_bar 45 <- turns the progress bar yellow to indicate some action is requested from the user
# draw_progress_bar 90 <- advance progress bar
# destroy_scroll_area <- remove progress bar
# Constants
CODE_SAVE_CURSOR="\033[s"
CODE_RESTORE_CURSOR="\033[u"
CODE_CURSOR_IN_SCROLL_AREA="\033[1A"
COLOR_FG="\e[30m"
COLOR_BG="\e[42m"
COLOR_BG_BLOCKED="\e[43m"
RESTORE_FG="\e[39m"
RESTORE_BG="\e[49m"
# Variables
PROGRESS_BLOCKED="false"
TRAPPING_ENABLED="false"
TRAP_SET="false"
setup_scroll_area() {
# If trapping is enabled, we will want to activate it whenever we setup the scroll area and remove it when we break the scroll area
if [ "$TRAPPING_ENABLED" = "true" ]; then
trap_on_interrupt
fi
lines=$(tput lines)
let lines=$lines-1
# Scroll down a bit to avoid visual glitch when the screen area shrinks by one row
echo -en "\n"
# Save cursor
echo -en "$CODE_SAVE_CURSOR"
# Set scroll region (this will place the cursor in the top left)
echo -en "\033[0;${lines}r"
# Restore cursor but ensure its inside the scrolling area
echo -en "$CODE_RESTORE_CURSOR"
echo -en "$CODE_CURSOR_IN_SCROLL_AREA"
# Start empty progress bar
draw_progress_bar 0
}
destroy_scroll_area() {
lines=$(tput lines)
# Save cursor
echo -en "$CODE_SAVE_CURSOR"
# Set scroll region (this will place the cursor in the top left)
echo -en "\033[0;${lines}r"
# Restore cursor but ensure its inside the scrolling area
echo -en "$CODE_RESTORE_CURSOR"
echo -en "$CODE_CURSOR_IN_SCROLL_AREA"
# We are done so clear the scroll bar
clear_progress_bar
# Scroll down a bit to avoid visual glitch when the screen area grows by one row
echo -en "\n\n"
# Once the scroll area is cleared, we want to remove any trap previously set. Otherwise, ctrl+c will exit our shell
if [ "$TRAP_SET" = "true" ]; then
trap - INT
fi
}
draw_progress_bar() {
percentage=$1
lines=$(tput lines)
let lines=$lines
# Save cursor
echo -en "$CODE_SAVE_CURSOR"
# Move cursor position to last row
echo -en "\033[${lines};0f"
# Clear progress bar
tput el
# Draw progress bar
PROGRESS_BLOCKED="false"
print_bar_text $percentage
# Restore cursor position
echo -en "$CODE_RESTORE_CURSOR"
}
block_progress_bar() {
percentage=$1
lines=$(tput lines)
let lines=$lines
# Save cursor
echo -en "$CODE_SAVE_CURSOR"
# Move cursor position to last row
echo -en "\033[${lines};0f"
# Clear progress bar
tput el
# Draw progress bar
PROGRESS_BLOCKED="true"
print_bar_text $percentage
# Restore cursor position
echo -en "$CODE_RESTORE_CURSOR"
}
clear_progress_bar() {
lines=$(tput lines)
let lines=$lines
# Save cursor
echo -en "$CODE_SAVE_CURSOR"
# Move cursor position to last row
echo -en "\033[${lines};0f"
# clear progress bar
tput el
# Restore cursor position
echo -en "$CODE_RESTORE_CURSOR"
}
print_bar_text() {
local percentage=$1
local cols=$(tput cols)
let bar_size=$cols-17
local color="${COLOR_FG}${COLOR_BG}"
if [ "$PROGRESS_BLOCKED" = "true" ]; then
color="${COLOR_FG}${COLOR_BG_BLOCKED}"
fi
# Prepare progress bar
let complete_size=($bar_size*$percentage)/100
let remainder_size=$bar_size-$complete_size
progress_bar=$(echo -ne "["; echo -en "${color}"; printf_new "#" $complete_size; echo -en "${RESTORE_FG}${RESTORE_BG}"; printf_new "." $remainder_size; echo -ne "]");
# Print progress bar
echo -ne " Progress ${percentage}% ${progress_bar}"
}
enable_trapping() {
TRAPPING_ENABLED="true"
}
trap_on_interrupt() {
# If this function is called, we setup an interrupt handler to cleanup the progress bar
TRAP_SET="true"
trap cleanup_on_interrupt INT
}
cleanup_on_interrupt() {
destroy_scroll_area
exit
}
printf_new() {
str=$1
num=$2
v=$(printf "%-${num}s" "$str")
echo -ne "${v// /$str}"
}
# SPDX-License-Identifier: MIT
#
# Copyright (c) 2018--2020 Polle Vanhoof
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.