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-- increment/decrement number in dec/hex/oct format
local lexer = vis.lexers
local lpeg = vis.lpeg
if not lexer.load or not lpeg then return end
local Cp = lpeg.Cp()
local dec_num = lpeg.S('+-')^-1 * lexer.dec_num
local pattern = lpeg.P{ Cp * (lexer.hex_num + lexer.oct_num + dec_num) * Cp + 1 * lpeg.V(1) }
local change = function(delta)
local win = vis.win
local file = win.file
local count = vis.count
if not count then count = 1 end
vis.count = nil -- reset count, otherwise it affects next motion
for selection in win:selections_iterator() do
local pos = selection.pos
if not pos then goto continue end
local word = file:text_object_word(pos);
if not word then goto continue end
local data = file:content(word.start, 1024)
if not data then goto continue end
local s, e = pattern:match(data)
if not s then goto continue end
data = string.sub(data, s, e-1)
if #data == 0 then goto continue end
-- align start and end for fileindex
s = word.start + s - 1
e = word.start + e - 1
local base, format, padding = 10, 'd', 0
if lexer.oct_num:match(data) then
base = 8
format = 'o'
padding = #data
elseif lexer.hex_num:match(data) then
base = 16
format = 'x'
padding = #data - #"0x"
end
local number = tonumber(data, base == 8 and 8 or nil)
if not number then goto continue end
number = number + delta * count
-- string.format does not support negative hex/oct values
if base ~= 10 and number < 0 then number = 0 end
number = string.format((base == 16 and "0x" or "") .. "%0"..padding..format, number)
if base == 8 and string.sub(number, 0, 1) ~= "0" then
number = '0' .. number
end
file:delete(s, e - s)
file:insert(s, number)
selection.pos = s
::continue::
end
end
vis:map(vis.modes.NORMAL, "<C-a>", function() change( 1) end, "Increment number")
vis:map(vis.modes.NORMAL, "<C-x>", function() change(-1) end, "Decrement number")
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