Hilbish/nature/greenhouse/init.lua

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-- Greenhouse is a simple text scrolling handler for terminal programs.
-- 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'
local terminal = require 'terminal'
local Page = require 'nature.greenhouse.page'
local Object = require 'nature.object'
local Greenhouse = Object:extend()
function Greenhouse:new(sink)
local size = terminal.size()
self.region = size
self.contents = nil -- or can be a table
self.start = 1 -- where to start drawing from (should replace with self.region.y)
self.offset = 1 -- vertical text offset
self.horizOffset = 1
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self.sink = sink
self.pages = {}
self.curPage = 1
self.step = {
horizontal = 5,
vertical = 1
}
self.separator = ''
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self.keybinds = {
['Up'] = function(self) self:scroll 'up' end,
['Down'] = function(self) self:scroll 'down' end,
['Left'] = function(self) self:scroll 'left' end,
['Right'] = function(self) self:scroll 'right' end,
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['Ctrl-Left'] = self.previous,
['Ctrl-Right'] = self.next,
['Ctrl-N'] = function(self) self:toc(true) end,
['Enter'] = function(self)
if self.isSpecial then
self:jump(self.specialPageIdx)
self:special(false)
end
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end,
['Page-Down'] = function(self) self:scroll('down', {page = true}) end,
['Page-Up'] = function(self) self:scroll('up', {page = true}) end
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}
self.isSpecial = false
self.specialPage = nil
self.specialPageIdx = 1
self.specialOffset = 1
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)
end
function Greenhouse:sub(str, offset, limit)
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local overhead = 0
local function addOverhead(s)
overhead = overhead + string.len(s)
end
local s = str:gsub('\x1b%[%d+;%d+;%d+;%d+;%d+%w', addOverhead)
:gsub('\x1b%[%d+;%d+;%d+;%d+%w', addOverhead)
:gsub('\x1b%[%d+;%d+;%d+%w',addOverhead)
:gsub('\x1b%[%d+;%d+%w', addOverhead)
:gsub('\x1b%[%d+%w', addOverhead)
return s:sub(offset, utf8.offset(str, limit + overhead) or limit + overhead)
--return s:sub(offset, limit + overhead)
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end
function Greenhouse:draw()
local workingPage = self.pages[self.curPage]
local offset = self.offset
if self.isSpecial then
offset = self.specialOffset
workingPage = self.specialPage
end
if workingPage.lazy and not workingPage.loaded then
workingPage.initialize()
end
local lines = workingPage.lines
self.sink:write(ansikit.getCSI(self.start .. ';1', 'H'))
self.sink:write(ansikit.getCSI(2, 'J'))
local writer = self.sink.writeln
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for i = offset, offset + self.region.height - 1 do
if i > #lines then break end
if i == offset + self.region.height - 1 then writer = self.sink.write end
self.sink:write(ansikit.getCSI(self.start + i - offset .. ';1', 'H'))
local line = lines[i]:gsub('{separator}', function() return self.separator:rep(self.region.width - 1) end)
writer(self.sink, self:sub(line:gsub('\t', ' '), self.horizOffset, self.region.width))
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end
writer(self.sink, '\27[0m')
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self:render()
end
function Greenhouse:render()
end
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function Greenhouse:scroll(direction, opts)
opts = opts or {}
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if self.isSpecial 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
local oldHorizOffset = self.horizOffset
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local amount = self.step.vertical
if opts.page then
amount = self.region.height
end
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if direction == 'down' then
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self.offset = math.min(self.offset + amount, math.max(1, #lines - self.region.height))
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elseif direction == 'up' then
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self.offset = math.max(self.offset - amount, 1)
end
--[[
if direction == 'left' then
self.horizOffset = math.max(self.horizOffset - self.step.horizontal, 1)
elseif direction == 'right' then
self.horizOffset = self.horizOffset + self.step.horizontal
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end
]]--
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if self.offset ~= oldOffset then self:draw() end
if self.horizOffset ~= oldHorizOffset then self:draw() end
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end
function Greenhouse:update()
self:resize()
if self.isSpecial then
self:updateSpecial()
end
self:draw()
end
function Greenhouse:special(val)
self.isSpecial = val
self:update()
end
function Greenhouse:toggleSpecial()
self:special(not self.isSpecial)
end
--- This function will be called when the special page
--- is on and needs to be updated.
function Greenhouse:updateSpecial()
end
function Greenhouse:contents()
end
function Greenhouse:toc(toggle)
if not self.isSpecial then
self.specialPageIdx = self.curPage
end
if toggle then self.isSpecial = not self.isSpecial 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
local contents = self:contents()
if contents then
for i, c in ipairs(contents) do
local title = c.title
if c.active then
title = lunacolors.invert(title)
end
tocText = tocText .. title .. '\n'
end
else
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.specialPageIdx then
title = lunacolors.invert(title)
end
tocText = tocText .. title .. '\n'
end
end
self.specialPage = Page('TOC', tocText)
function self:updateSpecial()
self:toc()
end
self:draw()
end
function Greenhouse:resize()
local size = terminal.size()
self.region = size
end
function Greenhouse:next(special)
local oldCurrent = special and self.specialPageIdx or self.curPage
local pageIdx = math.min(oldCurrent + 1, #self.pages)
if special then
self.specialPageIdx = pageIdx
else
self.curPage = pageIdx
end
if pageIdx ~= oldCurrent then
self.offset = 1
self:update()
end
end
function Greenhouse:previous(special)
local oldCurrent = special and self.specialPageIdx or self.curPage
local pageIdx = math.max(self.curPage - 1, 1)
if special then
self.specialPageIdx = 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:input(char)
end
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()
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while not done do
local c = read()
self:keybind('Ctrl-Q', function()
done = true
end)
self:keybind('Ctrl-D', function()
done = true
end)
if self.keybinds[c] then
self.keybinds[c](self)
else
self:input(c)
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end
end
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ansikit.showCursor()
ansikit.screenMain()
end
function read()
terminal.saveState()
terminal.setRaw()
local c = hilbish.editor.readChar()
terminal.restoreState()
return c
end
return Greenhouse