From b64509498d740f268c775164980a6cdf0d999e15 Mon Sep 17 00:00:00 2001
From: Thies Lennart Alff <lennart.alff@gmail.com>
Date: Mon, 30 Aug 2021 10:38:41 +0200
Subject: [PATCH] automatic creation of links

---
 .gitignore      |  1 +
 create_links.sh | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 create_links.sh

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e384660
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/backup
diff --git a/create_links.sh b/create_links.sh
new file mode 100755
index 0000000..c71e90f
--- /dev/null
+++ b/create_links.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+FILE_PATH=$(readlink -f "$0")
+REPO_DIR=$(dirname "$FILE_PATH")
+BACKUP_DIR="$REPO_DIR/backup"
+mkdir -p "$BACKUP_DIR"
+FILE_DST=("$HOME/.zshrc" "$HOME/.vimrc" "$HOME/.gitconfig")
+
+for f_out in "${FILE_DST[@]}"
+do
+	FNAME="$(basename -- $f_out)"
+	F_SRC="$REPO_DIR/$FNAME"
+	if [ -f $f_out ] && [ ! -L "$f_out" ]; then
+		echo "Replacing '$f_out' with symlink."
+		i=0
+		F_BACKUP_BASE="$BACKUP_DIR/$FNAME"
+		F_BACKUP=$F_BACKUP_BASE
+		while [ -e "$F_BACKUP" ]; do
+			printf -v F_BACKUP '%s.backup%04d' "$F_BACKUP_BASE" "$(( i++ ))"
+		done
+		echo "Moving '$f_out' to '$F_BACKUP'"
+		mv "$f_out" "$F_BACKUP"
+		ln -sv "$F_SRC" "$f_out"
+	else
+		echo "$f_out does not exist as regular file."
+		if [ -e "$f_out" ]; then
+			echo "There is already a symlink for $f_out. Skipping..."
+		else
+			ln -sv "$F_SRC" "$f_out"
+		fi
+	fi
+done