terminal.coffee: only console.log() if it exists

[watch-my-terminal.git] / terminal.coffee

diff --git a/terminal.coffee b/terminal.coffee
index 141165b..8e87bb6 100644 (file)
--- a/terminal.coffee
+++ b/terminal.coffee
@@ -7,6 +7,11 @@ else
        window.terminal = {}
        my_exports = window.terminal
 
+if console?.log?
+       log = -> console.log arguments...
+else
+       log = -> null
+
 class Terminal
        # public:
        constructor: (width, height) ->
@@ -202,7 +207,7 @@ class Terminal
                                                @text[row][i] = ' '
                                                @attributes[row][i] = @a
                        else
-                               console.log "confusing arg for csi_J: #{direction}"
+                               log "confusing arg for csi_J: #{direction}"
                return
 
        # clear (some or all of) current line
@@ -226,7 +231,7 @@ class Terminal
                                        @text[@y][i] = ' '
                                        @attributes[@y][i] = @a
                        else
-                               console.log "confusing arg for csi_K: #{direction}"
+                               log "confusing arg for csi_K: #{direction}"
                return
        
        # move lines downwards (arg is how far)
@@ -249,6 +254,27 @@ class Terminal
                                @text[y][x] = ' '
                                @attributes[y][x] = 0x07
 
+       # move lines upwards (arg is how far)
+       # this obliterates the line under the cursor and arg-1 following it
+       csi_M: (lines) ->
+               lines = parseInt @fix_esc_arg lines, '1'
+
+               rearrange = (a) =>
+                       return [
+                               a[0 ... @y]..., # keep everything above cursor
+                               a[@y + lines .. @scroll_bottom]..., # lines we're moving up
+                               a[@y ... @y + lines]..., # recycle these
+                               a[@scroll_bottom + 1 ... @height]... # keep the rest
+                       ]
+               @text = rearrange @text
+               @attributes = rearrange @attributes
+
+               # clear the lines we're recycling
+               for y in [@scroll_bottom - lines + 1 .. @scroll_bottom]
+                       for x in [0...@width]
+                               @text[y][x] = ' '
+                               @attributes[y][x] = 0x07
+
        # misc
        csiq_h: ->
                args = []
@@ -259,7 +285,7 @@ class Terminal
                                        @cursor_visible = true
                                when '1049'
                                        if @saved_normal_screen?
-                                               console.log "ignoring request to switch to the alt screen because we're already on the alt screen"
+                                               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 = []
@@ -271,7 +297,7 @@ class Terminal
                                                        @text[y].push ' '
                                                        @attributes[y].push 0x07
                                else
-                                       console.log "confusing arg for csiq_h: #{arg}"
+                                       log "confusing arg for csiq_h: #{arg}"
                return
 
        # unmisc
@@ -284,7 +310,7 @@ class Terminal
                                        @cursor_visible = false
                                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"
+                                               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]
@@ -292,7 +318,7 @@ class Terminal
                                        @attributes = @saved_normal_screen[3]
                                        @saved_normal_screen = null
                                else
-                                       console.log "confusing arg for csiq_l: #{arg}"
+                                       log "confusing arg for csiq_l: #{arg}"
                return
 
        # set color, bold, underline, etc
@@ -431,7 +457,7 @@ class Terminal
 
                                else
                                        # if we don't recognize the style, go back to default
-                                       console.log "unrecognized csi_m arg: \"#{arg}\""
+                                       log "unrecognized csi_m arg: \"#{arg}\""
                                        @a = 0
                return
 
@@ -455,7 +481,7 @@ class Terminal
                        str = str.substr 1
                command = @[prefix + str.substr(str.length - 1)]
                if not command?
-                       console.log "Unrecognized sequence: ESC[#{str}"
+                       log "Unrecognized sequence: ESC[#{str}"
                        return
                args = str.substr(0, str.length - 1).split ';'
                command.call this, args...
@@ -463,7 +489,7 @@ class Terminal
        update_sequence_then_text: (str) ->
                len = @escape_sequence_length str
                if len is -1
-                       console.log "couldn't find escape sequence here: #{str.substr 0, 25}"
+                       log "couldn't find escape sequence here: #{str.substr 0, 25}"
                        @update_text "ESC[" + str
                else
                        @update_sequence str.substr 0, len