Hilbish/nature/greenhouse/init.lua

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-- Greenhouse is a simple text scrolling handler for terminal programs.
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-- The idea is that it can be set a region to do its scrolling and paging
-- job and then the user can draw whatever outside it.
-- This reduces code duplication for the message viewer
-- and flowerbook.
local ansikit = require 'ansikit'
local lunacolors = require 'lunacolors'
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local terminal = require 'terminal'
local Page = require 'nature.greenhouse.page'
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local Object = require 'nature.object'
local Greenhouse = Object:extend()
function Greenhouse:new(sink)
local size = terminal.size()
self.region = size
self.start = 1
self.offset = 1 -- vertical text offset
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self.sink = sink
self.pages = {}
self.curPage = 1
self.keybinds = {
['Up'] = function(self) self:scroll 'up' end,
['Down'] = function(self) self:scroll 'down' end,
['Ctrl-Left'] = self.previous,
['Ctrl-Right'] = self.next,
['Ctrl-N'] = function(self) self:toc(true) end,
}
self.isToc = false
self.tocPage = nil
self.tocPageIdx = 1
self.tocOffset = 1
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return self
end
function Greenhouse:addPage(page)
table.insert(self.pages, page)
end
function Greenhouse:updateCurrentPage(text)
local page = self.pages[self.curPage]
page:setText(text)
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end
function Greenhouse:draw()
local workingPage = self.pages[self.curPage]
local offset = self.offset
if self.isToc then
offset = self.tocOffset
workingPage = self.tocPage
end
local lines = workingPage.lines
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self.sink:write(ansikit.getCSI(self.start .. ';1', 'H'))
self.sink:write(ansikit.getCSI(2, 'J'))
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-- the -2 negate is for the command and status line
for i = offset, offset + (self.region.height - self.start) do
if i > #lines then break end
self.sink:writeln('\r' .. lines[i]:gsub('\t', ' '):sub(0, self.region.width - 2))
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end
self.sink:write '\r'
self:render()
end
function Greenhouse:render()
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end
function Greenhouse:scroll(direction)
if self.isToc then
if direction == 'down' then
self:next(true)
elseif direction == 'up' then
self:previous(true)
end
return
end
local lines = self.pages[self.curPage].lines
local oldOffset = self.offset
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if direction == 'down' then
self.offset = math.min(self.offset + 1, #lines)
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elseif direction == 'up' then
self.offset = math.max(self.offset - 1, 1)
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end
if self.offset ~= oldOffset then self:draw() end
end
function Greenhouse:update()
self:resize()
if self.isToc then
self:toc()
end
self:draw()
end
function Greenhouse:resize()
local size = terminal.size()
self.region = size
end
function Greenhouse:next(toc)
local oldCurrent = toc and self.tocPageIdx or self.curPage
local pageIdx = math.min(oldCurrent + 1, #self.pages)
if toc then
self.tocPageIdx = pageIdx
else
self.curPage = pageIdx
end
if pageIdx ~= oldCurrent then
self.offset = 1
self:update()
end
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end
function Greenhouse:previous(toc)
local oldCurrent = toc and self.tocPageIdx or self.curPage
local pageIdx = math.max(self.curPage - 1, 1)
if toc then
self.tocPageIdx = pageIdx
else
self.curPage = pageIdx
end
if pageIdx ~= oldCurrent then
self.offset = 1
self:update()
end
end
function Greenhouse:jump(idx)
if idx ~= self.curPage then
self.offset = 1
end
self.curPage = idx
self:update()
end
function Greenhouse:keybind(key, callback)
self.keybinds[key] = callback
end
function Greenhouse:toc(toggle)
if not self.isToc then
self.tocPageIdx = self.curPage
end
if toggle then self.isToc = not self.isToc end
-- Generate a special page for our table of contents
local tocText = string.format([[
%s
]], lunacolors.cyan(lunacolors.bold '―― Table of Contents ――'))
local genericPageCount = 1
for i, page in ipairs(self.pages) do
local title = page.title
if title == 'Page' then
title = 'Page #' .. genericPageCount
genericPageCount = genericPageCount + 1
end
if i == self.tocPageIdx then
title = lunacolors.invert(title)
end
tocText = tocText .. title .. '\n'
end
self.tocPage = Page('TOC', tocText)
self:draw()
end
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function Greenhouse:initUi()
local ansikit = require 'ansikit'
local bait = require 'bait'
local commander = require 'commander'
local hilbish = require 'hilbish'
local terminal = require 'terminal'
local Page = require 'nature.greenhouse.page'
local done = false
bait.catch('signal.sigint', function()
ansikit.clear()
done = true
end)
bait.catch('signal.resize', function()
self:update()
end)
ansikit.screenAlt()
ansikit.clear(true)
self:draw()
hilbish.goro(function()
while not done do
local c = read()
if c == 'Ctrl-D' then
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done = true
end
if self.keybinds[c] then
self.keybinds[c](self)
end
--[[
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if c == 27 then
local c1 = read()
if c1 == 91 then
local c2 = read()
if c2 == 66 then -- arrow down
self:scroll 'down'
elseif c2 == 65 then -- arrow up
self: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
self:next()
elseif c5 == 68 then
self:previous()
end
end
end
end
end
goto continue
end
]]--
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::continue::
end
end)
while not done do
--
end
ansikit.screenMain()
end
function read()
terminal.saveState()
terminal.setRaw()
local c = hilbish.editor.readChar()
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terminal.restoreState()
return c
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end
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return Greenhouse