Custom Shell Scripts

Collection of custom made shell scripts for various linux operations

Table Of Contents

• Desktop Configuration
  • Alacritty Theme Changer
  • Background Changer
• Leet Code
  • Initialize Directory Structure
  • Create a Problem file
  • Archive the File and Update

Desktop Configuration

Alacritty Theme Changer

Custom script to quickly change the alacritty theme. Theme changes instantly. Themes should be placed inside “THEME_DIR”. Alacritty config file should import that same theme file.

Commands:

alacritty-themer ls

Lists possible theme options

alacritty-themer <theme>

Changes the current theme

# Specify the alacritty config and theme directory
ALACRITTY_DIR="$HOME/.config/alacritty"
THEME_DIR="$HOME/.config/alacritty/themes"

# List theme options
if [ "$#" = 0 ] || [ "$1" = "ls" ]; then
	echo "The current options are:"
	ls "$THEME_DIR" | sed 's/\([a-z_0-9]*\).yaml/ - \1/g'
	exit 0
fi

# Try to update the current theme
if ls $THEME_DIR | grep -w "$1.yaml" >/dev/null; then
	sed -i 's|\('"$THEME_DIR"'/\)[a-z_0-9]*\(.yaml\)|\1'"$1"'\2|' "$ALACRITTY_DIR"/alacritty.yml
    exit 0
else
	echo "Couldn't change the theme. Please check spelling."
	exit 1
fi

Background Changer

Custom script to quickly change the background image. This script assumes there is a single file in “WALLPAPER_SRC” which is the background sourced when booting the pc. What it does is replacing that file with copy of an image chosen from the “WALLPAPER_DIR”.

Commands:

chbg ls

Lists possible wallpaper options

chbg <image>

Changes the wallpaper file and reloads it using ‘feh’

# Specify wallpaper directory and wallpaper sourced by applications
WALLPAPER_DIR="$HOME/.config/wallpaper/collection"
WALLPAPER_SRC="$HOME/.config/wallpaper/wallpaper.png"

# List wallpaper options
if [ "$#" = 0 ] || [ "$1" = "ls" ]; then
	echo "The wallpaper options are:"
	ls "$WALLPAPER_DIR" | sed 's/\([a-z_0-9]*\).png/ - \1/g'
	exit 0
fi

# Try to update the current wallpaper
if ls $WALLPAPER_DIR | grep -w "$1.png" >/dev/null; then
	cp "$WALLPAPER_DIR"/"$1".png "$WALLPAPER_SRC" 2>/dev/null
    feh --bg-fill $WALLPAPER_SRC
    exit 0
else
	echo "Couldn't change the wallpaper. Please check spelling."
	exit 1
fi

Leet Code

Initialize Directory Structure

if [ $# -gt 1 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
    echo "$0 initializes the directory structure for LeetCode problem solving"
    echo "$0 also creates a README file to track the progress of solved problems"
    exit 1
fi

TOPICS=(
    "Arrays & Hashing"
    "Backtracking"
    "Binary Search"
    "Binary Trees"
    "Bit Manipulation"
    "Dynamic Programming 1D"
    "Dynamic Programming 2D"
    "Graphs"
    "Graphs Advanced"
    "Greedy"
    "Intervals"
    "Linked Lists"
    "Math & Geometry"
    "Priority Queue"
    "Sliding Window"
    "Stack"
    "Tries"
    "Two Pointers"
)
DIFFICULTIES=(
    "Easy"
    "Medium"
    "Hard"
)

for TOPIC in "${TOPICS[@]}"; do
    for DIFFICULTY in "${DIFFICULTIES[@]}"; do
        mkdir -p "$(pwd)"/"$TOPIC"/"$DIFFICULTY"
    done
done


cat > README.md << EOF
# LeetCode Solutions/Analysis

> Collection of my solutions to [LeetCode](https://leetcode.com) problems

## Table of Contents
  - [Progress Tracking](#progress-tracking)
  - [Milestones](#milestones)
  - [Useful Links](#useful-links)

## Progress Tracking

### Problems Solved

| Total | 0 |
|:---:|:---:|

#### Search By Topic

| Topic | Number |
|:---|---:|
EOF

for TOPIC in "${TOPICS[@]}"; do
    echo "| $TOPIC | 0 |" >> README.md
done

cat >> README.md << EOF

#### Search By Difficulty

| Difficulty | Number |
|:---|---:|
EOF

for DIFFICULTY in "${DIFFICULTIES[@]}"; do
    echo "| $DIFFICULTY | 0 |" >> README.md
done

cat >> README.md << EOF



## Milestones

| Date | Description |
|------|-------------|
|      |             |

## Useful Links
EOF

exit 0

Create a Problem file

if [ $# -lt 2 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
    echo "$0 creates a new file to solve a specific problem"
    echo "$0 takes at least two parameters (number and name)"
    echo "Usage: $0 <problem_number> <problem_name> <difficulty> <topic>"
    exit 1
fi

NAME=${2// /}
cat > "$1"_"$NAME".cpp <<-EOF
/* 
 * Problem: $1 
 * Name: $2
 * Difficulty: $3
 * Topic: 
 * Link: https://leetcode.com/problems/
 */
 
#include <bits/stdc++.h>
using namespace std;
EOF

exit 0

Archive the File and Update

if [ $# -gt 2 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
    echo "$0 archives a solve in the correct directory based on the Difficulty and Topic comments"
    echo "$0 updates the README file, incrementing the corresponding values for the solved problems"
    echo "$0 creates a commit with the file in the right position and a simple commit message"
    exit 1
fi

NUMBER=$(head -n 2 <"$1" | tail -n 1 | cut -b 13-255)
NAME=$(head -n 3 <"$1" | tail -n 1 | cut -b 10-255)
DIFFICULTY=$(head -n 4 <"$1" | tail -n 1 | cut -b 16-255)
TOPIC=$(head -n 5 <"$1" | tail -n 1 | cut -b 11-255)

case "$DIFFICULTY" in
"Easy" | "Medium" | "Hard") ;;
*)
    echo "ERROR! Incorrect Difficulty value!"
    exit 1
    ;;
esac

case "$TOPIC" in
"Arrays & Hashing" | "Backtracking" | "Binary Search" | "Binary Trees" | "Bit Manipulation" | "Dynamic Programming 1D" | "Dynamic Programming 2D" | "Graphs" | "Graphs Advanced" | "Greedy" | "Intervals" | "Linked Lists" | "Math & Geometry" | "Priority Queue" | "Sliding Window" | "Stack" | "Tries" | "Two Pointers") ;;
*)
    echo "ERROR! Incorrect Topic Name!"
    exit 1;
    ;;
esac

mv "$1" "$TOPIC"/"$DIFFICULTY"

sed -ri 's/(\| )('"$TOPIC"'[[:space:]]\|[[:space:]])([0-9]+)( \|)/echo "\1\2$((\3+1))\4"/ge' README.md

sed -ri 's/(\| )('"$DIFFICULTY"'[[:space:]]\|[[:space:]])([0-9]+)( \|)/echo "\1\2$((\3+1))\4"/ge' README.md

sed -ri 's/(\| )(Total[[:space:]]\|[[:space:]])([0-9]+)( \|)/echo "\1\2$((\3+1))\4"/ge' README.md


git add "$TOPIC"/"$DIFFICULTY"/"$1" README.md
git commit -a -m "Solved problem $NUMBER: $NAME"

exit 0