add setup script

README.md

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+# Usage
+1. Install [oh-my-zsh](https://ohmyz.sh/#install) and set zsh as your default shell
+2. `source setup.sh` which will setup symbolic links for you. When you update this repo, the file contents will be updated
+3. Open a new terminal to check for the updated config, enjoy!

setup.sh

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+#!/bin/bash
+
+# Automatically get the directory from which the script is run
+REPO_DIR=$(pwd)
+
+# Define the location of the files in the home directory
+VIMRC="$HOME/.vimrc"
+TMUX_CONF="$HOME/.tmux.conf"
+
+# Backup .vimrc if it exists
+if [ -f "$VIMRC" ]; then
+    echo "Backing up .vimrc to .vimrc.bak"
+    cp "$VIMRC" "${VIMRC}.bak"
+fi
+
+# Backup .tmux.conf if it exists
+if [ -f "$TMUX_CONF" ]; then
+    echo "Backing up .tmux.conf to .tmux.conf.bak"
+    cp "$TMUX_CONF" "${TMUX_CONF}.bak"
+fi
+
+# Backup .zshrc if it exists
+if [ -f "$HOME/.zshrc" ]; then
+    echo "Backing up .zshrc to .zshrc.bak"
+    cp "$HOME/.zshrc" "$HOME/.zshrc.bak"
+fi
+
+# Create symbolic links for .vimrc and .tmux.conf
+ln -sf "$REPO_DIR/config/.vimrc" "$HOME/.vimrc"
+ln -sf "$REPO_DIR/config/.tmux.conf" "$HOME/.tmux.conf"
+
+# Replace the ZSH_CUSTOM line with the correct path
+ZSHRC="$REPO_DIR/config/.zshrc"
+ZSH_CUSTOM_LINE="ZSH_CUSTOM=$REPO_DIR/config"
+sed -i "/^ZSH_CUSTOM=/c\\$ZSH_CUSTOM_LINE" "$ZSHRC" || echo "$ZSH_CUSTOM_LINE" >> "$ZSHRC"
+
+# Create a symbolic link for .zshrc
+ln -sf "$ZSHRC" "$HOME/.zshrc"
+
+# Ignore changes in .zshrc in the future
+git update-index --assume-unchanged "config/.zshrc"
+
+echo "Setup completed successfully."