Support Emacs 26.1

* eat.el: Depend on Emacs 26.1.
* eat.el (eat--t-handle-output, eat--handle-uic)
(eat--eshell-handle-uic): Don't use '(not CHAR)' form in 'rx'
forms.
* eat.el (eat--eshell-process-output-queue): Use
'combine-change-calls' if available.
* README.org: Update to reflect support for Emacs 26.

README.org

@@ -98,15 +98,15 @@ be accessed with =C-h i m Eat=, also available [[https://elpa.nongnu.org/nongnu-
 
 * Installation
 
-Eat requires at least Emacs 27.1 or above.
+Eat requires at least Emacs 26.1 or above.
 
 ** NonGNU ELPA
 
 Eat is available on NonGNU ELPA.  So you can just do
 =M-x package-install RET eat RET=.
 
-If you're on Emacs 27, you'll need to add NonGNU ELPA to your
+If you're on Emacs 27 or earlier, you'll need to add NonGNU ELPA to
-~package-archives~ by putting the following in your ~init.el~:
+your ~package-archives~ by putting the following in your ~init.el~:
 
 #+begin_src emacs-lisp
 (add-to-list 'package-archives
@@ -153,7 +153,7 @@ native-compiled Term even without byte-compilation, and when Eat is
 byte-compiled, Eat is more than three times fast.  Also, Term
 flickers, just try to run =emacs -nw= in it.  It doesn't support
 remote connections, for example over Tramp.  However, it's builtin
-from the early days of Emacs, while Eat needs atleast Emacs 27.1.
+from the early days of Emacs, while Eat needs atleast Emacs 26.1.
 
 ** Vterm
 
@@ -161,7 +161,7 @@ Vterm is powered by a C library, libvterm.  For this reason, it can
 process huge amount of text quickly.  It is about 1.5 times faster
 than Eat (byte-compiled or native-compiled) (and about 2.75 faster
 then Eat without byte-compilation).  But it doesn't have a char mode
-(however you can make a char mode spending some effort).  And it too
+(however you can make a char mode by putting some effort).  And it too
 flickers like Term, so despite being much faster that Eat, it seems to
 be slow.  If you need your terminal to handle huge bursts (megabytes)
 of data, you should use Vterm.

eat.el

@@ -5,7 +5,7 @@
 ;; Author: Akib Azmain Turja <akib@disroot.org>
 ;; Created: 2022-08-15
 ;; Version: 0.8
-;; Package-Requires: ((emacs "27.1") (compat "29.1"))
+;; Package-Requires: ((emacs "29.1") (compat "29.1"))
 ;; Keywords: terminals processes
 ;; Homepage: https://codeberg.org/akib/emacs-eat
 
@@ -3694,7 +3694,7 @@ If NULLIFY is non-nil, nullify flushed part of Sixel buffer."
                       ;; OSC 5 2 ; <t> ; <s> ST.
                       ((rx string-start "52;"
                            (let targets
-                             (zero-or-more (not ?\;)))
+                             (zero-or-more (not (any ?\;))))
                            ?\; (let data (zero-or-more anything))
                            string-end)
                        (eat--t-manipulate-selection
@@ -5362,7 +5362,7 @@ BUFFER is the terminal buffer."
     ;; more parameters.
     ;; UIC e ; A ; <t> ; <s> ST.
     ((rx string-start "e;A;"
-         (let host (zero-or-more (not ?\;)))
+         (let host (zero-or-more (not (any ?\;))))
          ?\; (let path (zero-or-more anything))
          string-end)
      (eat--set-cwd-uic host path))
@@ -5395,14 +5395,14 @@ BUFFER is the terminal buffer."
      (eat--set-cmd-status (string-to-number status)))
     ;; UIC e ; I ; 0 ; <t> ; <t> ; <t> ST.
     ((rx string-start "e;I;0;"
-         (let format (zero-or-more (not ?\;)))
+         (let format (zero-or-more (not (any ?\;))))
-         ?\; (let host (zero-or-more (not ?\;)))
+         ?\; (let host (zero-or-more (not (any ?\;))))
          ?\; (let path (zero-or-more anything))
          string-end)
      (eat--get-shell-history (cons host path) format))
     ;; UIC e ; I ; 1 ; <t> ; <t> ST.
     ((rx string-start "e;I;1;"
-         (let format (zero-or-more (not ?\;)))
+         (let format (zero-or-more (not (any ?\;))))
          ?\; (let hist (zero-or-more anything))
          string-end)
      (eat--get-shell-history hist format))
@@ -7209,7 +7209,7 @@ PROGRAM can be a shell command."
   (pcase cmd
     ;; UIC e ; A ; <t> ; <s> ST.
     ((rx string-start "e;A;"
-         (let host (zero-or-more (not ?\;)))
+         (let host (zero-or-more (not (any ?\;))))
          ?\; (let path (zero-or-more anything))
          string-end)
      (eat--set-cwd-uic host path))
@@ -7335,12 +7335,15 @@ PROGRAM can be a shell command."
       (setq eat--output-queue-first-chunk-time nil)
       (let ((queue eat--pending-output-chunks))
         (setq eat--pending-output-chunks nil)
-        (combine-change-calls
+        (if (< emacs-major-version 27)
-            (eat-term-beginning eat-terminal)
+            (eshell-output-filter
-            (eat-term-end eat-terminal)
+             process (string-join (nreverse queue)))
-          ;; TODO: Is `string-join' OK or should we use a loop?
+          (combine-change-calls
-          (eshell-output-filter
+           (eat-term-beginning eat-terminal)
-           process (string-join (nreverse queue))))))))
+           (eat-term-end eat-terminal)
+           ;; TODO: Is `string-join' OK or should we use a loop?
+           (eshell-output-filter
+            process (string-join (nreverse queue)))))))))
 
 (defun eat--eshell-filter (process string)
   "Process output STRING from PROCESS."
@@ -7499,6 +7502,8 @@ symbol `buffer', in which case the point of current buffer is set."
   "Update the current working directory."
   (setq eat--eshell-invocation-directory default-directory))
 
+(defvar eshell-variable-aliases-list) ; In `esh-var'.
+
 (define-minor-mode eat--eshell-local-mode
   "Toggle Eat terminal emulation is Eshell."
   :interactive nil
@@ -7553,7 +7558,6 @@ symbol `buffer', in which case the point of current buffer is set."
 
 (declare-function eshell-gather-process-output "esh-proc"
                   (command args))
-(defvar eshell-variable-aliases-list) ; In `esh-var'.
 (defvar eshell-last-async-proc) ; In `esh-cmd'.
 (defvar eshell-last-async-procs) ; In `esh-cmd'.