eshell/emacs: add find-library integration and window control

README.org

@@ -11,9 +11,22 @@ file organization suggests.
 *** Corfu
 **** clean up orderless
 **** integrate with yasnippets
-** eshell/emacs
+** eshell/emacs DWIM
+CONTROL FLOW
+#+begin_quote
+1. Check arguments
+   1. No args: run new Emacs instance, separate frame, windowed
+   2. existing file names: open each in new buffer (`find-file`?) ?(and window)?
+      1. non-existent file names
+	 1. if name of library, edit that library
+	    1. otherwise edit new file of that name in default-directory
+   3. dash options
+      1. =-nw=​: open in same window
+      2. =--client=​: use =emacsclient= instead of =emacs=
+      3. Pass rest of options to exe
+#+end_quote
 *** /usr/bin/emacs or emacsclient fallback for options
-*** find-library etc
+*** DONE find-library etc
 ** eshell/dat
 *** fix naming and loading
 *** "bcat"

lisp/mitch-packages.el

@@ -158,12 +158,28 @@
     "Basically you can edit ARGS and it will open in a new buffer.
 When your shell is Emacs, your Emacs is but an oyster...
 This is taken from a website that I can't remember at the moment."
-    (if (null args) (bury-buffer)
-      (let ((open-func (if (one-window-p)
-			   #'find-file-other-window
-			 #'find-file)))
-	(mapc open-func
-	      (mapcar #'expand-file-name (flatten-tree (reverse args)))))))
+    (let* ((exe (if (member "--client" args)
+		    (executable-find "emacsclient")
+		  (executable-find "emacs")))
+	   (args (remove "--client" args))
+	   (openfun (lambda (arg)
+		      (let ((arg-file-name (expand-file-name arg))
+			    (arg-lib-name (locate-library arg)))
+			(if (file-exists-p arg-file-name)
+			    (funcall find-fun arg-file-name)
+			  (if arg-lib-name
+			      (funcall lib-fun arg)
+			    (funcall find-fun arg-file-name)))))))
+      (if (and (one-window-p) (not (member "-nw" args)))
+	  (setq find-fun #'find-file-other-window
+		lib-fun #'find-library-other-window)
+	(setq find-fun #'find-file
+	      lib-fun #'find-library))
+      (setq args (remove "-nw" args))
+      (if (null args)
+	  (async-shell-command exe)
+	(mapcar openfun
+		(flatten-tree (reverse args))))))
   (defun mitch/eshell-setup-keys ()
     (evil-collection-define-key
       'normal