Bahadir's Personal Bash Startup File

.bashrc

#!/bin/bash
########################################################################################
# Name: Beautiful and Efficient Terminal
# 
# Customize the Bash environment to enhance usability, efficiency, and aesthetics.
#
# Author: Bahadır Dönmez
# Date: 2023/12/10
########################################################################################

########################################################################################
# Global Configuration and Script Loading
########################################################################################

# Load global Bash configuration file if available.
GLOBAL_BASH_CONFIG="/etc/bash.bashrc"
if [[ -r "$GLOBAL_BASH_CONFIG" ]]; then
    . "$GLOBAL_BASH_CONFIG"
else
    echo "Warning: $(basename $GLOBAL_BASH_CONFIG) not found or not readable."
fi

# Load advanced Bash completion features.
BASH_COMPLETION_SCRIPT="/usr/share/bash-completion/bash_completion"
if [[ -r "$BASH_COMPLETION_SCRIPT" ]]; then
    . "$BASH_COMPLETION_SCRIPT"
else
    echo "Warning: $(basename $BASH_COMPLETION_SCRIPT) not found or not readable."
fi

########################################################################################
# History and Auto-Completion Enhancements
########################################################################################

# Enable searching in history for previous commands that start with the current input.
bind '"\e[A": history-search-backward'  # Up arrow for backward history search.
bind '"\e[B": history-search-forward'   # Down arrow for forward history search.

# Improve auto-completion behavior.
bind "set completion-ignore-case on"  # Case-insensitive completion.
bind "set show-all-if-ambiguous on"   # Show all completions on single tab press.

# Enable Ctrl-S for forward history navigation (complementing Ctrl-R for reverse).
stty -ixon

# Configure history settings.
export HISTCONTROL=erasedups:ignoredups:ignorespace  # Remove duplicates, ignore spaces.
export HISTSIZE=100000                               # Max history lines.
export HISTFILESIZE=100000                           # Max history file size.

# Preserve history across terminal sessions by appending rather than overwriting.
shopt -s histappend    
export PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"

########################################################################################
# General Utility Aliases and Functions
########################################################################################

# Enhanced 'ls' command aliases for various listing formats.
alias la='ls -Alh --color=auto'   # Display all files in long format.
alias ls='ls -AFh --color=auto'   # Default listing with color, file type indicators.
alias lk='ls -AlhS --color=auto'  # Sort files by size in long format.

# Enhanced 'grep' command aliases for improved search capabilities.
alias grep='grep --color=auto'  # Color-highlighted grep search results.

# Searche for text in all files in the current folder
    # -i case-insensitive
    # -I ignore binary files
    # -H causes filename to be printed
    # -r recursive search
    # -n causes line number to be printed
    # optional: -F treat search term as a literal, not a regular expression
    # optional: -l only print filenames and not the matching lines ex. grep -irl "$1" *
ftext () {
    grep -iIHrn --color=always "$1" . | less -r
}

########################################################################################
# Custom Prompt Design and Welcome Message
########################################################################################

alias mem="free | grep Mem | awk '{printf(\"%.1f\n\", (\$3+\$5)/\$2 * 100.0)}'"

# Function to generate a colorful, informative prompt.
function __setprompt {
    
    # This needs to be first to capture the exit status of the last command
    local EXIT="$?"                  

    # Define text colors
    local WHITE_BOLD_TXT="\[\e[1;97m\]"  # Bold White text
    local LBLUE_BOLD_TXT="\[\e[1;94m\]"  # Bold Light Blue text
    local RED_BOLD_TXT="\[\e[0;31m\]"    # Bold Red text
    local BLUE_BOLD_TXT="\[\e[0;34m\]"   # Bold Blue text

    # Define background colors
    local DARK_RED_BG="\[\e[41m\]"            # Red background
    local DARK_BLUE_BG="\[\e[44m\]"            # Red background

    # Define symbols
    local TOP_LINE='╭─'
    local BOTTOM_LINE='╰─'
    local LEFT_ARROW=$'\uE0B2'
    local RIGHT_ARROW=$'\uE0B0'

    # Topline
    PS1="${LBLUE_BOLD_TXT}${TOP_LINE}"

    # Username and host
    PS1+="${RED_BOLD_TXT}${LEFT_ARROW}${WHITE_BOLD_TXT}${DARK_RED_BG} \u@\h "

    # Seperator
    PS1+="${RED_BOLD_TXT}${DARK_BLUE_BG}${RIGHT_ARROW}"

    # CPU load 
    local CPU_LOAD=$(uptime | sed 's/.*load average: //' | awk -F\, '{print $1}')
    PS1+="${WHITE_BOLD_TXT}${DARK_BLUE_BG} CPU ${CPU_LOAD}"

    # RAM usage
    local RAM_USAGE=$(free | grep Mem | awk '{printf("%.1f", $3/$2 * 100.0)}')
    PS1+="${WHITE_BOLD_TXT}${DARK_BLUE_BG} · RAM ${RAM_USAGE}% "

    # Seperator
    PS1+="${BLUE_BOLD_TXT}${DARK_RED_BG}${RIGHT_ARROW}"

    # Test
    PS1+="${RED_BOLD_TXT}${WHITE_BOLD_TXT}${DARK_RED_BG} \u@\h "

    # Date
	PS1+="\[${DARKGRAY}\](\[${CYAN}\]\$(date +%a) $(date +%b-'%-m')" # Date
	PS1+="${BLUE} $(date +'%-I':%M:%S%P)\[${DARKGRAY}\])-" # Time

    # Skip to the next line
	PS1+="\n"

    # Bottomline
    PS1+="${LBLUE_BOLD_TXT}${BOTTOM_LINE}"

    # Prefix
    if [[ $EUID -ne 0 ]]; then
		PS1+="${LBLUE_BOLD_TXT} \$ \[\033[0m\]" # Normal user
	else
		PS1+="${LBLUE_BOLD_TXT} \# \[\033[0m\]" # Root user
	fi
}

# Welcome message
echo -e "${GREEN_BOLD_TXT}Welcome to your terminal, $(whoami)! ${HEART}${WHITE_BOLD_TXT}"
echo -e "${BLUE_BOLD_TXT}Type 'help' for a list of useful commands.${WHITE_BOLD_TXT}\n"

# Set the custom prompt
PROMPT_COMMAND="__setprompt; $PROMPT_COMMAND"

########################################################################################
# Machine Specific Aliases and Functions
########################################################################################