add gtk stuff to show completions as user types

buffer.fnl

@@ -34,4 +34,9 @@
             (tset buffers name b)
             b))
    :find (fn [term] (. buffers term))
+   ;; will rename this to "find" once we've got rid of the
+   ;; only remaining call to the existing Buffer.find
+   :match (fn [s] (collect [name buffer (pairs buffers)]
+                    (if (string.find name s)
+                        (values name buffer))))
    })

command.fnl

@@ -23,8 +23,10 @@
 
 (define-command
  "visit-location"
- [[:buffer #[$1] (fn [f] f.buffer.name)]
-  [:url  #[$1] #(do "http://www.example.com")]
+ [[:buffer
+   Buffer.match
+   #"main"]
+  [:url  #(doto {} (tset $1 $1)) #(do "http://www.example.com")]
   ]
  (fn [{:url url :buffer buffer}]
    (let [b (Buffer.find buffer)] (: b :visit url))))
@@ -98,11 +100,30 @@
      :default (and param (param.default self.frame))
      }))
 
-(fn update-widget-state [{ : entry : prompt} result]
+(fn update-widget-state [{ : entry : completions-widget : prompt} result]
   (set prompt.label (or result.prompt ""))
   (set entry.sensitive result.active)
+  (if (not result.active)
+      (completions-widget:hide))
   (set entry.text (or result.default result.error "")))
 
+(fn on-input [self str]
+  (match self.state
+    {:command c :this-param param-name}
+    (let [parent self.completions-widget
+          { : completer}  (. c.params param-name)
+          completions (completer str)]
+      (parent:foreach #(parent:remove $1))
+      (each [text _w (pairs completions)]
+        (parent:add (Gtk.Button {
+                                 :label text
+                                 :on_clicked
+                                 #(update-widget-state self (self:on-activate text))
+                                 })))
+      (parent:show_all)
+      )))
+
+
 (fn activate [{: state : entry : prompt}]
   (tset state :active true)
   (set entry.sensitive true)
@@ -130,21 +151,32 @@
   (let [entry (Gtk.Entry {:sensitive false })
         prompt (Gtk.Label { :label ""})
         box (Gtk.Box {
+                      :orientation Gtk.Orientation.VERTICAL
+                      })
+        hbox (Gtk.Box {
                       :orientation Gtk.Orientation.HORIZONTAL
                       })
+        completions (Gtk.FlowBox)
         self {
               :state default-state
               : activate
               :active? (fn [self] self.state.active)
+              : on-input
               : on-activate
               : invoke-interactively
               : entry
               :widget box
               : prompt
               : frame
+              :completions-widget completions
               }]
-    (box:pack_start prompt false false 15)
-    (box:pack_start entry true true 5)
+    (hbox:pack_start prompt false false 15)
+    (hbox:pack_start entry true true 5)
+    (box:pack_start hbox true false 0)
+    (box:pack_start completions true true 0)
+    (tset entry :on_changed
+          (fn [event]
+            (self:on-input event.text)))
     (tset entry :on_activate
           (fn [event]
             (let [result  (self:on-activate event.text)]

test/command.fnl

@@ -12,8 +12,8 @@
 
 (Command.define-command
  "multiply"
- [[:a #[$1] #(do "3")]
-  [:b #[$1] #(do "2")]]
+ [[:a #{$1 $1} #"3"]
+  [:b #{$1 $1} #"2"]]
  (fn [{: a : b }] (set happened (* (tonumber a) (tonumber b)))))
 
 (before)