Add a slides type to new_tex_document

Extraction now takes the whole tree and copies the template out with
tar -h, so symlinks into resources/ arrive as real files rather than as
links pointing outside the new document.

new_beamer_presentation is superseded; cdsc_tex_aliases.sh keeps the name
as an alias.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

new_tex_document

@@ -10,7 +10,7 @@ CURDIR=$(pwd)
 
 usage() {
     echo "Usage: $(basename "$0") <type> <directory>"
-    echo "Types: paper, memo, knitr, letter"
+    echo "Types: paper, memo, knitr, letter, slides"
     exit 1
 }
 
@@ -44,6 +44,12 @@ case "$TYPE" in
         TEMPLATE="letter_template"
         EXT="tex"
         ;;
+    slides)
+        REPO="$HOME/tex/cdsc_tex"
+        BRANCH="master"
+        TEMPLATE="slides_template"
+        EXT="tex"
+        ;;
     *)
         echo "error: unknown type '$TYPE'"
         usage
@@ -56,8 +62,14 @@ if [ -e "$DEST" ]; then
 fi
 
 WORK_DIR=$(mktemp -d)
+TREE_DIR=$(mktemp -d)
+trap 'rm -rf "$TREE_DIR"' EXIT
+
+# Extract the whole tree, then copy the template out with tar -h, so that
+# symlinks into resources/ become real files in the new document.
 cd "$REPO"
-git archive --format=tar "$BRANCH" "$TEMPLATE" | tar x --strip=1 -C "$WORK_DIR"
+git archive --format=tar "$BRANCH" | tar x -C "$TREE_DIR"
+tar -chf - -C "$TREE_DIR/$TEMPLATE" . | tar x -C "$WORK_DIR"
 cd "$CURDIR"
 mv "$WORK_DIR" "$DEST"
 cd "$DEST"