feat: use difftastic

dot_gitconfig.tmpl

@@ -35,6 +35,7 @@
 [diff]
 	noprefix = true
     colorMoved = True
+    external = difft
 [commit]
 	verbose = true
 [color "status"]

run_onchange_before_26_difftastic.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+INSTALL_DIR="${HOME}/.local/bin"
+BINARY_NAME="difft"
+TARBALL="difft-x86_64-unknown-linux-gnu.tar.gz"
+DOWNLOAD_URL="https://github.com/Wilfred/difftastic/releases/latest/download/${TARBALL}"
+
+echo "Downloading difftastic..."
+wget -q --show-progress -O "/tmp/${TARBALL}" "${DOWNLOAD_URL}"
+
+echo "Extracting..."
+tar -xzf "/tmp/${TARBALL}" -C /tmp
+
+echo "Installing to ${INSTALL_DIR}..."
+sudo mv "/tmp/${BINARY_NAME}" "${INSTALL_DIR}/${BINARY_NAME}"
+sudo chmod +x "${INSTALL_DIR}/${BINARY_NAME}"
+
+echo "Cleaning up..."
+rm -f "/tmp/${TARBALL}"
+
+echo "difftastic installed successfully!"
+difft --version