feat(nature/greenhouse): support setting multiple pages

nature/commands/greenhouse.lua

@@ -4,17 +4,21 @@ local commander = require 'commander'
 local hilbish = require 'hilbish'
 local terminal = require 'terminal'
 local Greenhouse = require 'nature.greenhouse'
+local Page = require 'nature.greenhouse.page'
 
 commander.register('greenhouse', function(args, sinks)
-	local fname = args[1]
+	local gh = Greenhouse(sinks.out)
 	local done = false
-	local f <close> = io.open(fname, 'r')
+
+	for _, name in ipairs(args) do
+		local f <close> = io.open(name, 'r')
 		if not f then
-		sinks.err:writeln(string.format('could not open file %s', fname))
+			sinks.err:writeln(string.format('could not open file %s', name))
 		end
 
-	local gh = Greenhouse(sinks.out)
-	gh:setText(f:read '*a')
+		local page = Page(f:read '*a')
+		gh:addPage(page)
+	end
 
 	bait.catch('signal.sigint', function()
 		done = true
@@ -44,6 +48,21 @@ commander.register('greenhouse', function(args, sinks)
 					elseif c2 == 65 then -- arrow up
 						gh:scroll 'up'
 					end
+
+					if c2 == 49 then
+						local c3 = read()
+						if c3 == 59 then
+							local c4 = read()
+							if c4 == 53 then
+								local c5 = read()
+								if c5 == 67 then
+									gh:next()
+								elseif c5 == 68 then
+									gh:previous()
+								end
+							end
+						end
+					end
 				end
 				goto continue
 			end

nature/greenhouse/init.lua

@@ -16,28 +16,43 @@ function Greenhouse:new(sink)
 	self.start = 1
 	self.offset = 1
 	self.sink = sink
+	self.pages = {}
+	self.curPage = 1
 
 	return self
 end
 
-function Greenhouse:setText(text)
-	self.lines = string.split(text, '\n')
+function Greenhouse:addPage(page)
+	table.insert(self.pages, page)
+end
+
+function Greenhouse:updateCurrentPage(text)
+	local page = self.pages[self.curPage]
+	page:setText(text)
 end
 
 function Greenhouse:draw()
+	local lines = self.pages[self.curPage].lines
 	self.sink:write(ansikit.getCSI(self.start .. ';1', 'H'))
+	self.sink:write(ansikit.getCSI(2, 'J'))
 
-	for i = self.offset, self.offset + (self.region.height - self.start) - 1 do
-		self.sink:write(ansikit.getCSI(2, 'K'))
-		self.sink:writeln('\r' .. self.lines[i]:gsub('\t', '        '):sub(0, self.region.width - 2))
+	-- the -2 negate is for the command and status line
+	for i = self.offset, self.offset + (self.region.height - self.start) - 2 do
+		if i > #lines then break end
+		self.sink:writeln('\r' .. lines[i]:gsub('\t', '        '):sub(0, self.region.width - 2))
 	end
 	self.sink:write '\r'
+
+	self.sink:write(ansikit.getCSI(self.region.height - self.start.. ';1', 'H'))
+	self.sink:writeln(string.format('Page %d', self.curPage))
 end
 
 function Greenhouse:scroll(direction)
+	local lines = self.pages[self.curPage].lines
+
 	local oldOffset = self.offset
 	if direction == 'down' then
-		self.offset = math.min(self.offset + 1, #self.lines)
+		self.offset = math.min(self.offset + 1, #lines)
 	elseif direction == 'up' then
 		self.offset = math.max(self.offset - 1, 1)
 	end
@@ -52,4 +67,15 @@ function Greenhouse:update()
 	self:draw()
 end
 
+function Greenhouse:next()
+	self.curPage = math.min(self.curPage + 1, #self.pages)
+	self.sink:write(ansikit.getCSI(2, 'J'))
+	self:draw()
+end
+
+function Greenhouse:previous()
+	self.curPage = math.max(self.curPage - 1, 1)
+	self:draw()
+end
+
 return Greenhouse

nature/greenhouse/page.lua

@@ -0,0 +1,13 @@
+local Object = require 'nature.object'
+
+local Page = Object:extend()
+
+function Page:new(text)
+	self:setText(text)
+end
+
+function Page:setText(text)
+	self.lines = string.split(text, '\n')
+end
+
+return Page