feat: add install script

README.md

@@ -8,3 +8,10 @@ Clone:
 ```
 git clone https://git.nanikore.de/compaqdisc/dotfiles.git ~/.dotfiles
 ```
+
+Install:
+```
+~/.dotfiles/install.sh
+```
+
+The install script symlinks to the shared directory and backs up original files.

install.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+DOTFILES="${DOTFILES:-$HOME/.dotfiles}"
+
+link_file() {
+    local src="$1"
+    local dst="$2"
+
+    if [[ ! -e "$src" ]]; then
+        echo "missing source: $src"
+        return 1
+    fi
+
+    if [[ -L "$dst" && "$(readlink "$dst")" == "$src" ]]; then
+        echo "ok: $dst -> $src"
+        return 0
+    fi
+
+    if [[ -e "$dst" || -L "$dst" ]]; then
+        printf "replace %s? [y/N] " "$dst"
+        read -r answer
+
+        case "$answer" in
+            y|Y|yes|YES)
+                mv "$dst" "$dst.bak.$(date +%Y%m%d%H%M%S)"
+                ;;
+            *)
+                echo "skip: $dst"
+                return 0
+                ;;
+        esac
+    fi
+
+    mkdir -p "$(dirname "$dst")"
+    ln -s "$src" "$dst"
+    echo "linked: $dst -> $src"
+}