@a = 0x000007 # cursor attributes
@partial = ''
@saved_normal_screen = null
+ @cursor_visible = true
+ @scroll_top = 0
+ @scroll_bottom = height - 1
@resize width, height
resize: (width, height) ->
# FIXME: write a version that retains some of the data
+ # FIXME: clamp variables (eg x, y, saved.*, scrolling region) if getting smaller
@width = width
@height = height
@text = []
@attributes[y] = []
for x in [0...width]
@text[y].push ' '
- @attributes[y].push 0
+ @attributes[y].push 0x07
# pass data from stdout
update: (data) ->
return
add_new_line: ->
- # clear top line
+ # clear the line at the top of the scrolling region
for i in [0...@width]
- @text[0][i] = ' '
- @attributes[0][i] = 0
- # move (newly cleared) top line to the bottom
- tmp = @text.shift()
- @text.push(tmp)
- tmp = @attributes.shift()
- @attributes.push(tmp)
+ @text[@scroll_top][i] = ' '
+ @attributes[@scroll_top][i] = 0x07
+
+ # move (newly cleared) top line to the bottom of the scrolling region
+ @text = [
+ @text[0...@scroll_top]..., # up to but not including scroll top
+ @text[@scroll_top + 1 .. @scroll_bottom]..., # scroll region except top line of it
+ @text[@scroll_top], # top line of scroll region (already cleared)
+ @text[@scroll_bottom + 1 ... @height]... # rest of screen
+ ]
+ @attributes = [
+ @attributes[0...@scroll_top]..., # up to but not including scroll top
+ @attributes[@scroll_top + 1 .. @scroll_bottom]..., # scroll region except top line of it
+ @attributes[@scroll_top], # top line of scroll region (already cleared)
+ @attributes[@scroll_bottom + 1 ... @height]... # rest of screen
+ ]
+
# slide cursor up with rest of text
@y -= 1
wrap_to_next_line: ->
- if @y is @height - 1
+ if @y is @scroll_bottom
@add_new_line()
@y += 1
@x = 0
else
return deef_alt
+ # csi_@: rxvt does nothing I can detect
+
+ # move cursor up
+ csi_A: (lines) ->
+ lines = parseInt @fix_esc_arg lines, '1'
+ @y -= lines
+ if @y < 0
+ @y = 0
+ return
+
+ # move cursor down
+ csi_B: (lines) ->
+ lines = parseInt @fix_esc_arg lines, '1'
+ @y += lines
+ if @y >= @height
+ @y = @height - 1
+ return
+
+ # move cursor right
+ csi_C: (cols) ->
+ cols = parseInt @fix_esc_arg cols, '1'
+ @x += cols
+ if @x >= @width
+ @x = @width - 1
+ return
+
+ # move cursor left
+ csi_D: (cols) ->
+ cols = parseInt @fix_esc_arg cols, '1'
+ @x -= cols
+ if @x < 0
+ @x = 0
+ return
+
# set cursor position (one based)
csi_H: (row, column) ->
# handle blank/missing args and convert to 0 base
- row = @fix_esc_arg(row, 1) - 1
- column = @fix_esc_arg(column, 1) - 1
+ row = -1 + parseInt @fix_esc_arg row, '1'
+ column = -1 + parseInt @fix_esc_arg column, '1'
#clamp values
if column < 0
#move the cursor
@x = column
@y = row
+ return
# clear to screen edge(es)
csi_J: (direction) ->
csiq_h: ->
args = []
for i in arguments
- switch @fix_esc_arg i, ''
+ arg = @fix_esc_arg i, ''
+ switch arg
+ when '25'
+ @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"
@attributes[y] = []
for x in [0...@width]
@text[y].push ' '
- @attributes[y].push 0
+ @attributes[y].push 0x07
+ else
+ console.log "confusing arg for csiq_h: #{arg}"
+ return
+
# unmisc
csiq_l: ->
args = []
for i in arguments
- switch @fix_esc_arg i, ''
+ arg = @fix_esc_arg i, ''
+ switch arg
+ when '25'
+ @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"
@text = @saved_normal_screen[2]
@attributes = @saved_normal_screen[3]
@saved_normal_screen = null
+ else
+ console.log "confusing arg for csiq_l: #{arg}"
+ return
# set color, bold, underline, etc
csi_m: ->
switch arg
# remove all style/color
when '0'
- @a = 0
+ @a = 0x07
# style attributes
when '1' # bold
@set_attribute_bits 0x010000, 0x010000
- # FIXME add '3' for italic ('23' to turn it off)
+ when '3' # italic (rare)
+ @set_attribute_bits 0x200000, 0x200000
when '4' # underline
@set_attribute_bits 0x020000, 0x020000
when '5' # blink
@set_attribute_bits 0x040000, 0x040000
when '7' # inverse
@set_attribute_bits 0x080000, 0x080000
- when '8' # invisible
+ when '8' # invisible. urivt ignores this
@set_attribute_bits 0x100000, 0x100000
# disable style attributes
- when '22' # not bold... according to a page
+ when '21' # not bold (rare)
@set_attribute_bits 0x010000, 0
- when '21' # ... though this would make more sense for "not bold"
+ when '22' # not bold
@set_attribute_bits 0x010000, 0
+ when '23' # not italic (rare)
+ @set_attribute_bits 0x200000, 0
when '24' # not underline
@set_attribute_bits 0x020000, 0
when '25' # not blink
@a = 0
return
+ # set scrolling region
+ csi_r: (top, bottom) ->
+ top = -1 + parseInt @fix_esc_arg top, '1'
+ bottom = -1 + parseInt @fix_esc_arg bottom, '10000'
+ if top < 0
+ top = 0
+ if bottom >= @height
+ bottom = @height - 1
+ @scroll_top = top
+ @scroll_bottom = bottom
+ return
+
# str is the whole escape sequence (minus the esc[ prefix)
update_sequence: (str) ->
prefix = 'csi_'
Got questions, comments, patches, etc.? Contact Jason Woofenden