X-Git-Url: https://jasonwoof.com/gitweb/?p=watch-my-terminal.git;a=blobdiff_plain;f=terminal.coffee;h=721ed80dc4b9b3af49cc6bb423229023a71566a6;hp=d371476211fea5315282b427a82bebcb9b64769b;hb=f864b5a4731e5ab5148b5fe20533e71691cf6955;hpb=469415c385464dc424c37f4602bf59233bbaa738

diff --git a/terminal.coffee b/terminal.coffee
index d371476..721ed80 100644
--- a/terminal.coffee
+++ b/terminal.coffee
@@ -20,10 +20,13 @@ class Terminal
 		@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 = []
@@ -54,20 +57,30 @@ class Terminal
 		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] = 0x07
-		# 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
@@ -121,6 +134,7 @@ class Terminal
 		@y -= lines
 		if @y < 0
 			@y = 0
+		return
 
 	# move cursor down
 	csi_B: (lines) ->
@@ -128,6 +142,7 @@ class Terminal
 		@y += lines
 		if @y >= @height
 			@y = @height - 1
+		return
 
 	# move cursor right
 	csi_C: (cols) ->
@@ -135,6 +150,7 @@ class Terminal
 		@x += cols
 		if @x >= @width
 			@x = @width - 1
+		return
 
 	# move cursor left
 	csi_D: (cols) ->
@@ -142,6 +158,7 @@ class Terminal
 		@x -= cols
 		if @x < 0
 			@x = 0
+		return
 
 	# set cursor position (one based)
 	csi_H: (row, column) ->
@@ -162,6 +179,7 @@ class Terminal
 		#move the cursor
 		@x = column
 		@y = row
+		return
 
 	# clear to screen edge(es)
 	csi_J: (direction) ->
@@ -238,6 +256,8 @@ class Terminal
 							@attributes[y].push 0x07
 				else
 					console.log "confusing arg for csiq_h: #{arg}"
+		return
+
 	# unmisc
 	csiq_l: ->
 		args = []
@@ -257,6 +277,7 @@ class Terminal
 					@saved_normal_screen = null
 				else
 					console.log "confusing arg for csiq_l: #{arg}"
+		return
 
 	# set color, bold, underline, etc
 	csi_m: ->
@@ -398,6 +419,18 @@ class Terminal
 					@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_'