um-next takes a list of tags, as a comma separated string

remove the '+' logic from the shell component.

i'm getting closer to just moving all logic into elisp. but that awk is so great.

README.md

@@ -145,6 +145,22 @@ Yields:
 + foo
 ```
 
+Or send a list of tags separated by commas. `+` still works:
+
+```sh
+um next foo +,bar,baz
+```
+
+Yields:
+
+```markdown
+# 05.foo.md
+: 2024.01.14
++ foo
++ bar
++ baz
+```
+
 ## last
 
 `um last` will print the name of the last numbered file. This can be useful on its own, or like this:

elisp/um.el

@@ -201,18 +201,23 @@ NOTE: this searches in the current project root only.
 ;; shell integration
 
 ;;;###autoload
-(defun um-next (next-file &optional tag skip-header)
+(defun um-next (next-file &optional tags skip-header)
   "Takes the next-file generated by the shell script and opens it.
 
-With the optional tag generated by the script.
+Optional TAGS string may contain more than one tag separated by a comma.
-And the option not to insert the um-journal-header.
+The SKIP-HEADER option says not to insert the um-journal-header at all,
+in which case TAGS is also ignored.
 "
   (find-file next-file)
   (unless skip-header
     (um-journal-header)
-      (if tag
+    (if tags
         (progn (forward-line -1)
-                 (insert (format "+ %s\n" tag))
+               (dolist (tag (split-string tags ","))
+                 (insert (format "+ %s\n"
+                                 (if (equal "+" tag)
+                                     (cadr (split-string next-file "\\."))
+                                   tag))))
                (forward-line))))
   (message (format "creating %s" next-file))
   )

shell/next.sh

@@ -31,13 +31,7 @@ NEXTFILE=`echo $LASTFILE | awk -f $UMBASEPATH/next.awk -v arg=$1`
 
 # tag is optional second arg to this script
 if [ $2 ]; then
-    # + means insert the string descriptor as tag
+    UMELISP=$(printf '(um-next "%s" "%s")' "$NEXTFILE" "$2")
-    if [ $2 = '+' ]; then
-        UMTAG="$1"
-    else
-        UMTAG="$2"
-    fi
-    UMELISP=$(printf '(um-next "%s" "%s")' "$NEXTFILE" "$UMTAG")
 else
     UMELISP=$(printf '(um-next "%s")' "$NEXTFILE")
 fi