From 51457299a9aca3673f9a6f8355aa7895409a74ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Pankowski?= <lukpank@o2.pl>
Date: Sun, 21 Sep 2025 21:51:19 +0200
Subject: [PATCH] vis: implement fast jump

---
 vis/.config/vis/fast-jump.lua | 110 ++++++++++++++++++++++++++++++++++
 vis/.config/vis/visrc.lua     |   1 +
 2 files changed, 111 insertions(+)
 create mode 100644 vis/.config/vis/fast-jump.lua

diff --git a/vis/.config/vis/fast-jump.lua b/vis/.config/vis/fast-jump.lua
new file mode 100644
index 0000000..7834b41
--- /dev/null
+++ b/vis/.config/vis/fast-jump.lua
@@ -0,0 +1,110 @@
+local lpeg = vis.lpeg
+
+P = lpeg.P
+R = lpeg.R
+S = lpeg.S
+Cp = lpeg.Cp
+Ct = lpeg.Ct
+space = S(' \t\n\r')
+alnum = R('az', 'AZ', '09')
+
+local function search(p)
+	return Ct(((1 - p)^0 * Cp() * p * Cp())^0)
+end
+
+vis:map(vis.modes.NORMAL, '\\', function(keys)
+	if #keys > 1 then
+		vis.win:draw()
+	end
+	local _, esc = keys:find('<Escape>')
+	if esc then
+		return esc
+	end
+	local _, enter = keys:find('<Enter>')
+	if enter then
+		keys = keys:gsub('<Enter>', '')
+	end
+	keys = keys:gsub('<Tab>', 'J')
+	keys = keys:gsub('<S[-]Tab>', 'K')
+	vis:info(keys)
+	local n = 0
+	keys = keys:gsub('[KJ]', function(s)
+		if s == 'K' then
+			n = n - 1
+		elseif s == 'J' then
+			n = n + 1
+		end
+		return ''
+	end)
+	keys = keys:gsub('.<Backspace>', '')
+	if #keys < 1 then
+		return -1
+	end
+	local up = n < 0
+	local v = vis.win.viewport.bytes
+	local data = vis.win.file:content(v)
+	local p = P(false)
+	local prefix = nil
+	for i = 1, #keys do
+		local x = keys:sub(i, i)
+		if x == 'A' then
+			prefix = alnum
+		elseif x == 'F' then
+			prefix = P(1) - space
+		else
+			local y = S(x:lower() .. x:upper())
+			if i == 1 then
+				p = y
+			elseif prefix then
+				p = p * (prefix - y)^0 * y
+			elseif x == ' ' then
+				p = p * space^1
+			else
+				p = p * y
+			end
+			prefix = false
+		end
+	end
+	p = search(p)
+	local lst = p:match(data)
+	if not lst then
+		vis:info('not found')
+		return
+	end
+	local pos = vis.win.selection.pos
+	local prev = 0
+	local next = 0
+	for i = 2, #lst, 2 do
+		local a = lst[i-1] + v.start - 1
+		if a < pos then
+			prev = i
+		end
+		if a > pos then
+			next = i
+			break
+		end
+	end
+	local j = 0
+	if up then
+		j = prev + 1 + 2 * n
+	else
+		j = next - 1 + 2 * n
+	end
+	if j > 0 and j < #lst then
+		pos = lst[j] + v.start - 1
+	end
+	if enter then
+		vis.win.selection.pos = pos
+		return enter
+	end
+	for i = 2, #lst, 2 do
+		local a = lst[i-1] + v.start - 1
+		local b = lst[i] + v.start - 2
+		if a == pos then
+			vis.win:style(vis.win.STYLE_COLOR_COLUMN, a, b)
+		else
+			vis.win:style(vis.win.STYLE_SELECTION, a, b)
+		end
+	end
+	return -1
+end, 'colorize token')
diff --git a/vis/.config/vis/visrc.lua b/vis/.config/vis/visrc.lua
index ba3e35d..aa394f6 100644
--- a/vis/.config/vis/visrc.lua
+++ b/vis/.config/vis/visrc.lua
@@ -1,4 +1,5 @@
 require('vis')
+require('fast-jump')
 
 local plug = (function()
 	if not pcall(require, 'plugins/vis-plug') then