Fix DYM and add aliases

Fixed the use-package! declaration for eshell-did-you-mean since it
needed a different mode in the :after than I thought.
I also put together a quick hack to try and fix an issue with
did-you-mean, but it doesn't seem to work reliably right now. More
testing required.

Also added two aliases, one `gg` for to open magit-status and one `ff`
as an additional alias to find-file that follows the Doom keybindings
better.

modules/term/eshell/README.org

@@ -8,6 +8,7 @@
   - [[#maintainers][Maintainers]]
   - [[#module-flags][Module Flags]]
   - [[#plugins][Plugins]]
+  - [[#hacks][Hacks]]
 - [[#prerequisites][Prerequisites]]
 - [[#features][Features]]
 - [[#configuration][Configuration]]
@@ -37,6 +38,12 @@ company= is enabled.
   + [[https://gitlab.com/ambrevar/emacs-fish-completion][fish-completion]]
   + [[https://github.com/szermatt/emacs-bash-completion][bash-completion]]
 
+** Hacks
++ Even with =fish-completion-fallback-on-bash-p= non-nil, fish must be installed
+  for bash completion to work. Workaround in =config.el=.
++ =eshell-did-you-mean= does not work on first invocation, so we manually invoke
+  it once.
+
 * Prerequisites
 [[https://fishshell.com/][=fish= shell]] for completions, falling back to [[https://www.gnu.org/software/bash/][=bash= shell]] if =fish= is not
 found. If neither shell is found, completions may not be available.

modules/term/eshell/config.el

@@ -12,6 +12,10 @@
   "Where to store eshell configuration files, as opposed to
 `eshell-directory-name', which is where Doom will store temporary/data files.")
 
+(defvar eshell-directory-name (concat doom-etc-dir "eshell")
+  "Where to store temporary/data files, as opposed to `eshell-config-dir',
+which is where Doom will store eshell configuration files.")
+
 (defvar +eshell-enable-new-shell-on-split t
   "If non-nil, spawn a new eshell session after splitting from an eshell
 buffer.")
@@ -22,11 +26,13 @@ buffer.")
 (defvar +eshell-aliases
   '(("q"  "exit")           ; built-in
     ("f"  "find-file $1")
+    ("ff" "find-file $1")
     ("d"  "dired $1")
     ("bd" "eshell-up $1")
     ("rg" "rg --color=always $*")
     ("l"  "ls -lh $*")
     ("ll" "ls -lah $*")
+    ("gg" "magit-status")
     ("clear" "clear-scrollback")) ; more sensible than default
   "An alist of default eshell aliases, meant to emulate useful shell utilities,
 like fasd and bd. Note that you may overwrite these in your
@@ -35,15 +41,11 @@ to define your aliases.
 
 You should use `set-eshell-alias!' to change this.")
 
-;;
-(defvar eshell-directory-name (concat doom-etc-dir "eshell"))
-
 ;; These files are exceptions, because they may contain configuration
 (defvar eshell-aliases-file (concat +eshell-config-dir "aliases"))
 (defvar eshell-rc-script    (concat +eshell-config-dir "profile"))
 (defvar eshell-login-script (concat +eshell-config-dir "login"))
 
-
 (defvar +eshell--default-aliases nil)
 
 
@@ -188,8 +190,14 @@ You should use `set-eshell-alias!' to change this.")
     :before-while #'fish-completion--list-completions-with-desc
     (executable-find "fish")))
 
-;; Active eshell-did-you-mean using its setup function which provides
+
-;; its own hooks.
+;; Activate eshell-did-you-mean using its setup function (lazily)
 (use-package! eshell-did-you-mean
-  :after eshell
+  :after esh-mode ; Specifically esh-mode, not eshell
-  :config (eshell-did-you-mean-setup))
+  :config
+  (eshell-did-you-mean-setup)
+  ;; HACK There is a known issue with `eshell-did-you-mean' where it does not
+  ;;      work on first invocation, so we invoke it once manually by setting
+  ;;      the last command and then calling the output filter.
+  (setq eshell-last-command-name "catt")
+  (eshell-did-you-mean-output-filter "catt: command not found"))