csiq_ prefix, alt screen flipping, clamp csi_H

diff --git a/terminal.coffee b/terminal.coffee
index f3ed817..abc006a 100644 (file)
--- a/terminal.coffee
+++ b/terminal.coffee
@@ -18,6 +18,7 @@ class Terminal
                @y = 0
                @a = 0x000007 # cursor attributes
                @partial = ''
                @y = 0
                @a = 0x000007 # cursor attributes
                @partial = ''

+               @saved_normal_screen = null

                @resize width, height
 
        resize: (width, height) ->
                @resize width, height
 
        resize: (width, height) ->

@@ -113,17 +114,23 @@ class Terminal
        csi_H: (row, column) ->
                row = 0 + @fix_esc_arg row, 1
                column = 0 + @fix_esc_arg column, 1
        csi_H: (row, column) ->
                row = 0 + @fix_esc_arg row, 1
                column = 0 + @fix_esc_arg column, 1

+

                # convert to 0 base
                column -= 1
                # convert to 0 base
                column -= 1

-               if 0 <= column < @width
-                       @x = column
-               else
-                       console.log "tried to move cursor to invalid column: #{column}"
-               row -= 1
-               if 0 <= row < @height
-                       @y = row
-               else
-                       console.log "tried to move cursor to invalid row: #{row}"
+
+               #clamp values
+               if column < 0
+                       column = 0
+               else if column >= @width
+                       column = @width - 1
+               if row < 0
+                       row = 0
+               if row >= @height
+                       row = @height - 1
+
+               #move the cursor
+               @x = column
+               @y = row

 
        # clear lines (implemented inclusive of the current line)
        csi_J: (direction) ->
 
        # clear lines (implemented inclusive of the current line)
        csi_J: (direction) ->

@@ -163,6 +170,39 @@ class Terminal
                                        @attributes[@y][i] = @a
                        else
                                console.log "confusing arg for csi_K: #{direction}"
                                        @attributes[@y][i] = @a
                        else
                                console.log "confusing arg for csi_K: #{direction}"

+       
+       # misc
+       csiq_h: ->
+               args = []
+               for i in arguments
+                       switch @fix_esc_arg i, ''
+                               when '1049'
+                                       if @saved_normal_screen?
+                                               console.log "ignoring request to switch to the alt screen because we're already on the alt screen"
+                                               return
+                                       @saved_normal_screen = [@x, @y, @text, @attributes]
+                                       @text = []
+                                       @attributes = []
+                                       for y in [0...@height]
+                                               @text[y] = []
+                                               @attributes[y] = []
+                                               for x in [0...@width]
+                                                       @text[y].push ' '
+                                                       @attributes[y].push 0
+       # unmisc
+       csiq_l: ->
+               args = []
+               for i in arguments
+                       switch @fix_esc_arg i, ''
+                               when '1049'
+                                       if not @saved_normal_screen?
+                                               console.log "ignoring request to switch to the normal screen because we're already on the normal screen"
+                                               return
+                                       @x = @saved_normal_screen[0]
+                                       @y = @saved_normal_screen[1]
+                                       @text = @saved_normal_screen[2]
+                                       @attributes = @saved_normal_screen[3]
+                                       @saved_normal_screen = null

 
        # set color, bold, underline, etc
        csi_m: ->
 
        # set color, bold, underline, etc
        csi_m: ->

@@ -298,7 +338,11 @@ class Terminal
 
        # str is the whole escape sequence (minus the esc[ prefix)
        update_sequence: (str) ->
 
        # str is the whole escape sequence (minus the esc[ prefix)
        update_sequence: (str) ->

-               command = @["csi_#{str.substr str.length - 1}"]
+               prefix = 'csi_'
+               if str[0] is '?'
+                       prefix = 'csiq_'
+                       str = str.substr 1
+               command = @[prefix + str.substr(str.length - 1)]

                if not command?
                        console.log "Unrecognized sequence: ESC[#{str}"
                        return
                if not command?
                        console.log "Unrecognized sequence: ESC[#{str}"
                        return