X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;f=elopher.el;h=a9c4661287d825a133032687b25216f8730ad682;hb=0e1e7f59ced20971199418cbf1ad0725c7d27d6d;hp=4408d4db1fb4b679be254d467c3ca3751227ab1b;hpb=bb306d884b0ede3e729b93275b9dee926fac2d10;p=elpher.git

diff --git a/elopher.el b/elopher.el
index 4408d4d..a9c4661 100644
--- a/elopher.el
+++ b/elopher.el
@@ -15,7 +15,7 @@
 (defconst elopher-margin-width 6
   "Width of left-hand margin used when rendering indicies.")
 
-(defconst elopher-start-page
+(defconst elopher-start-index
   (string-join
    (list "i\tfake\tfake\t1"
          "i--------------------------------------------\tfake\tfake\t1"
@@ -28,6 +28,7 @@
          "i - RET/mouse-1: open directory entry\tfake\tfake\t1"
          "i - u: return to parent directory entry\tfake\tfake\t1"
          "i - g: go to a particular site\tfake\tfake\t1"
+         "i - r: reload current page\tfake\tfake\t1"
          "i\tfake\tfake\t1"
          "iPlaces to start exploring Gopherspace:\tfake\tfake\t1"
          "1Floodgap Systems Gopher Server\t\tgopher.floodgap.com\t70"
@@ -55,6 +56,8 @@
   "Face used for info records.")
 (defcustom elopher-image-face '(foreground-color . "green")
   "Face used for image records.")
+(defcustom elopher-search-face '(foreground-color . "orange")
+  "Face used for image records.")
 (defcustom elopher-unknown-face '(foreground-color . "red")
   "Face used for unknown record types.")
 
@@ -77,37 +80,58 @@
 
 ;; Node
 
-(defun elopher-make-node (parent address getter &optional content)
-  (list parent address getter content))
+(defun elopher-make-node (parent address getter &optional content pos)
+  (list parent address getter content pos))
 
 (defun elopher-node-parent (node)
-  (car node))
+  (elt node 0))
 
 (defun elopher-node-address (node)
-  (cadr node))
+  (elt node 1))
 
 (defun elopher-node-getter (node)
-  (caddr node))
+  (elt node 2))
 
 (defun elopher-node-content (node)
-  (cadddr node))
+  (elt node 3))
 
-(defvar elopher-start-node (elopher-make-node nil nil #'elopher-get-index-node))
-(defvar elopher-current-node)
+(defun elopher-node-pos (node)
+  (elt node 4))
 
 (defun elopher-set-node-content (node content)
-  (setcar (elopher-node-content node)
-          content))
+  (setcar (nthcdr 3 node) content))
+
+(defun elopher-set-node-pos (node pos)
+  (setcar (nthcdr 4 node) pos))
+
+(defun elopher-save-pos ()
+  (when elopher-current-node
+    (elopher-set-node-pos elopher-current-node (point))))
+
+(defun elopher-restore-pos ()
+  (let ((pos (elopher-node-pos elopher-current-node)))
+    (if pos
+        (goto-char pos)
+      (goto-char (point-min)))))
+
+;; Node graph traversal
+
+(defvar elopher-current-node)
 
 (defun elopher-visit-node (node)
+  (elopher-save-pos)
   (elopher-prepare-buffer)
   (setq elopher-current-node node)
   (funcall (elopher-node-getter node)))
 
+(defun elopher-visit-parent-node ()
+  (let ((parent-node (elopher-node-parent elopher-current-node)))
+    (when parent-node
+      (elopher-visit-node parent-node))))
+      
 (defun elopher-reload-current-node ()
-  (elopher-prepare-buffer)
   (elopher-set-node-content elopher-current-node nil)
-  (funcall (elopher-node-getter elopher-current-node)))
+  (elopher-visit-node elopher-current-node))
 
 
 ;;; Buffer preparation
@@ -130,6 +154,7 @@
       (elopher-insert-index-record line))))
 
 (defun elopher-insert-margin (&optional type-name)
+  "Insert index margin, optionally containing the TYPE-NAME, into the current buffer."
   (if type-name
       (progn
         (insert (format (concat "%" (number-to-string (- elopher-margin-width 1)) "s")
@@ -145,7 +170,11 @@
   (let* ((type (elt line 0))
          (fields (split-string (substring line 1) "\t"))
          (display-string (elt fields 0))
-         (address (elopher-make-address (elt fields 1) (elt fields 2) (elt fields 3))))
+         (address (elopher-make-address (elt fields 1) (elt fields 2) (elt fields 3)))
+         (help-string (format "mouse-1, RET: open %s on %s port %s"
+                              (elopher-address-selector address)
+                              (elopher-address-host address)
+                              (elopher-address-port address))))
     (pcase type
       (?i (elopher-insert-margin)
           (insert (propertize display-string
@@ -157,7 +186,8 @@
                                                                address
                                                                #'elopher-get-text-node)
                               'action #'elopher-click-link
-                              'follow-link t))
+                              'follow-link t
+                              'help-echo help-string))
       (?1 (elopher-insert-margin "/")
           (insert-text-button display-string
                               'face elopher-index-face
@@ -165,7 +195,26 @@
                                                                address
                                                                #'elopher-get-index-node)
                               'action #'elopher-click-link
-                              'follow-link t))
+                              'follow-link t
+                              'help-echo help-string))
+      ((or ?g ?p ?I) (elopher-insert-margin "im")
+          (insert-text-button display-string
+                              'face elopher-image-face
+                              'elopher-node (elopher-make-node elopher-current-node
+                                                               address
+                                                               #'elopher-get-image-node)
+                              'action #'elopher-click-link
+                              'follow-link t
+                              'help-echo help-string))
+      (?7 (elopher-insert-margin "?")
+          (insert-text-button display-string
+                              'face elopher-search-face
+                              'elopher-node (elopher-make-node elopher-current-node
+                                                              address
+                                                              #'elopher-get-search-node)
+                              'action #'elopher-click-link
+                              'follow-link t
+                              'help-echo help-string))
       (?.) ; Occurs at end of index, can safely ignore.
       (tp (elopher-insert-margin (concat (char-to-string tp) "?"))
           (insert (propertize display-string
@@ -178,7 +227,10 @@
 
 (defvar elopher-selector-string)
 
-(defun elopher-get-selector (address after)
+(defun elopher-get-selector (address after &optional binary)
+  "Retrieve selector specified by ADDRESS and store it in the
+string elopher-selector-string, then execute AFTER as the
+sentinal function."
   (setq elopher-selector-string "")
   (let ((p (get-process "elopher-process")))
     (if p (delete-process p)))
@@ -198,36 +250,103 @@
   (let ((content (elopher-node-content elopher-current-node))
         (address (elopher-node-address elopher-current-node)))
     (if content
-        (insert content)
+        (progn
+          (let ((inhibit-read-only t))
+            (insert content))
+          (elopher-restore-pos))
       (if address
-          (elopher-get-selector address
-                                (lambda (proc event)
-                                  (let ((inhibit-read-only t))
-                                    (erase-buffer)
-                                    (elopher-insert-index elopher-selector-string))
-                                  (elopher-set-node-content elopher-current-node
-                                                            (buffer-string))))
-        (let ((inhibit-read-only t))
-          (erase-buffer)
-          (elopher-insert-index elopher-start-page))))))
+          (progn
+            (let ((inhibit-read-only t))
+              (insert "LOADING DIRECTORY..."))
+            (elopher-get-selector address
+                                  (lambda (proc event)
+                                    (let ((inhibit-read-only t))
+                                      (erase-buffer)
+                                      (elopher-insert-index elopher-selector-string))
+                                    (elopher-restore-pos)
+                                    (elopher-set-node-content elopher-current-node
+                                                              (buffer-string)))))
+        (progn
+          (let ((inhibit-read-only t))
+            (elopher-insert-index elopher-start-index))
+          (elopher-restore-pos)
+          (elopher-set-node-content elopher-current-node
+                                    (buffer-string)))))))
 
 ;; Text retrieval
 
+(defun elopher-strip-CRs (string)
+  (replace-regexp-in-string "\r" "" string))
+
 (defun elopher-get-text-node ()
   (let ((content (elopher-node-content elopher-current-node))
         (address (elopher-node-address elopher-current-node)))
     (if content
+        (progn
+          (let ((inhibit-read-only t))
+            (insert content))
+          (elopher-restore-pos))
+      (progn
         (let ((inhibit-read-only t))
-          (insert content))
-      (elopher-get-selector address
-                            (lambda (proc event)
-                              (let ((inhibit-read-only t))
-                                (erase-buffer)
-                                (insert elopher-selector-string))
-                              (elopher-set-node-content elopher-current-node
-                                                        elopher-selector-string))))))
-
-;;; Navigation methods
+          (insert "LOADING TEXT..."))
+        (elopher-get-selector address
+                              (lambda (proc event)
+                                (let ((inhibit-read-only t))
+                                  (erase-buffer)
+                                  (insert (elopher-strip-CRs elopher-selector-string)))
+                                (elopher-restore-pos)
+                                (elopher-set-node-content elopher-current-node
+                                                          (buffer-string))))))))
+
+;; Image retrieval
+
+(defun elopher-get-image-node ()
+  (let ((content (elopher-node-content elopher-current-node))
+        (address (elopher-node-address elopher-current-node)))
+    (if content
+        (progn
+          (let ((inhibit-read-only t))
+            (insert-image content))
+          (setq cursor-type nil)
+          (elopher-restore-pos))
+      (progn
+        (let ((inhibit-read-only t))
+          (insert "LOADING IMAGE..."))
+        (elopher-get-selector address
+                              (lambda (proc event)
+                                (let ((image (create-image
+                                              (string-as-unibyte elopher-selector-string)
+                                              nil t))
+                                      (inhibit-read-only t))
+                                  (erase-buffer)
+                                  (insert-image image)
+                                  (setq cursor-type nil)
+                                  (elopher-restore-pos)
+                                  (elopher-set-node-content elopher-current-node image))))))))
+
+;; Search retrieval
+
+(defun elopher-get-search-node ()
+  (let* ((content (elopher-node-content elopher-current-node))
+         (address (elopher-node-address elopher-current-node))
+         (search-address (elopher-make-address (concat (elopher-address-selector address)
+                                                       "\t"
+                                                       (read-from-minibuffer "Query: "))
+                                               (elopher-address-host address)
+                                               (elopher-address-port address))))
+    (let ((inhibit-read-only t))
+      (insert "LOADING RESULTS..."))
+    (elopher-get-selector search-address
+                          (lambda (proc event)
+                            (let ((inhibit-read-only t))
+                              (erase-buffer)
+                              (elopher-insert-index elopher-selector-string))
+                            (elopher-restore-pos)
+                            (elopher-set-node-content elopher-current-node
+                                                      (buffer-string))))))
+
+
+;;; Navigation procedures
 ;;
 
 (defun elopher-next-link ()
@@ -263,37 +382,45 @@
   (interactive)
   (elopher-reload-current-node))
 
-
-;;; Main start procedure
-;;
-(defun elopher ()
-  "Start elopher with default landing page."
+(defun elopher-back ()
+  "Go to previous site."
   (interactive)
-  (elopher-visit-node elopher-start-node))
+  (if (elopher-node-parent elopher-current-node)
+      (elopher-visit-parent-node)
+    (message "No previous site.")))
 
 
 ;;; Mode and keymap
 ;;
 
-(setq elopher-mode-map
+(defvar elopher-mode-map
   (let ((map (make-sparse-keymap)))
     (define-key map (kbd "<tab>") 'elopher-next-link)
     (define-key map (kbd "<S-tab>") 'elopher-prev-link)
-    (define-key map (kbd "u") 'elopher-pop-history)
+    (define-key map (kbd "u") 'elopher-back)
     (define-key map (kbd "g") 'elopher-go)
     (define-key map (kbd "r") 'elopher-reload)
     (when (require 'evil nil t)
       (evil-define-key 'normal map
         (kbd "C-]") 'elopher-follow-closest-link
-        (kbd "C-t") 'elopher-pop-history
-        (kbd "u") 'elopher-pop-history
+        (kbd "C-t") 'elopher-back
+        (kbd "u") 'elopher-back
         (kbd "g") 'elopher-go
         (kbd "r") 'elopher-reload))
-    map))
-  ;; "Keymap for gopher client.")
+    map)
+  "Keymap for gopher client.")
 
 (define-derived-mode elopher-mode special-mode "elopher"
   "Major mode for elopher, an elisp gopher client.")
 
 
+;;; Main start procedure
+;;
+(defun elopher ()
+  "Start elopher with default landing page."
+  (interactive)
+  (setq elopher-current-node nil)
+  (let ((start-node (elopher-make-node nil nil #'elopher-get-index-node)))
+    (elopher-visit-node start-node)))
+
 ;;; elopher.el ends here