refactor(common): Use symlinks to state, which files should be replaced

Every symlink in the `./templates` directory is now replaced with
the file it points to, making it obvious that this file should not be
edited.

1 files changed, 43 insertions, 0 deletions

diff --git a/instantiate_templates.sh b/instantiate_templates.sh
new file mode 100755
index 0000000..eaffcb2
--- /dev/null
+++ b/instantiate_templates.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env sh
+
+#! Copies the templates from `templates/*` to `build/*` and replaces every symlink with a
+#! copy.
+
+# Source: https://stackoverflow.com/a/20460402
+# Checks if the string (arg2) starts with the substring (arg1)
+#
+# arg1: substring
+# arg2: string
+stringContain() { case $2 in $1*) return 0 ;; *) return 1 ;; esac }
+
+ROOT="$(git rev-parse --show-toplevel)"
+
+DRY_RUN_CMD=""
+
+$DRY_RUN_CMD mkdir --parents "$ROOT/build"
+
+fd . "$ROOT/templates" --max-depth 1 --type directory | while read -r template; do
+    echo "Instantiating template: '.${template#"$ROOT"}'.."
+    template_new_path="$ROOT/build/$(basename "$template")"
+    $DRY_RUN_CMD cp --no-target-directory --recursive "${template%/}" "$template_new_path"
+
+    {
+        # Show directories
+        fd . "$template_new_path" --type symlink --follow --hidden
+
+        # Show simple files
+        fd . "$template_new_path" --type symlink --hidden
+    } | while read -r symlink; do
+        symlink_path="$(readlink --canonicalize "$symlink")"
+
+        if stringContain "$ROOT" "$symlink_path"; then
+            echo "Instantiating symlink: '.${symlink#"$ROOT"}'.."
+            $DRY_RUN_CMD rm "$symlink"
+            $DRY_RUN_CMD cp "$symlink_path" "$symlink"
+        else
+            echo "Not instantiating symlink '.${symlink#"$ROOT"}', as it points outside the repo!"
+        fi
+    done
+done
+
+# vim: ft=sh