-- This file:
--   https://anggtwu.net/LUA/DiagTeX1.lua.html
--   https://anggtwu.net/LUA/DiagTeX1.lua
--           (find-angg "LUA/DiagTeX1.lua")
-- Author: Eduardo Ochs <eduardoochs@gmail.com>
-- Version: 2026may24
-- Used by:
--
-- A partial replacement for:
--   (find-dn6 "diagtex.lua")
--   (find-dn6 "diagtex.lua" "arrow_to_TeX")
--   (find-dn6 "diagtex.lua" "DxyArrow" "arrow_to_TeX")
--   (find-dn6 "diagforth.lua")

-- This file overrides some functions from diagtex.lua and defines a
-- new word in forths[].

-- New:
diag_wrap = function (fmt,body)
    return format(fmt or "%s", body)
  end

-- Overrides for functions from:
-- (find-dn6 "diagtex.lua" "DxyArrow" "arrow_to_TeX")
--
node_to_TeX = function (node)
    local tex = node.tex or node.tag
    local TeX = node.TeX or (tex and unabbrev(tex))
    return (TeX and "{"..TeX.."}") or ""
  end
arrow_to_TeX = function (arrow)
    local node1 = nodes[arrow.from]
    local node2 = nodes[arrow.to]
    local x1, y1 = realxy(node1.x, node1.y)
    local x2, y2 = realxy(node2.x, node2.y)
    local dx, dy = x2 - x1, y2 - y1
    local N1 = node_to_TeX(node1)
    local N2 = node_to_TeX(node2)
    --
    -- 2026may24:
    N1 = diag_wrap(arrow.wrap_from, N1)
    N2 = diag_wrap(arrow.wrap_to,   N2)
    --
    -- Calculate p, sh, L.
    -- In several complex cases the "placement" p and the "label" L
    -- are moved into the "shape" parameter sh; see:
    --   (find-es "diagxy" "shape")
    local p, sh, L = arrow_to_TeX_pshL(arrow)  -- defined below
    local morphism = dformat("\\morphism(%d,%d)%s%s<%d,%d>[%s`%s;%s]",
                             x1, y1, p, sh, dx, dy, N1, N2, L)
    return diag_wrap(arrow.wrap_morphism, morphism)
  end

arrow_to_TeX_pshL = function (arrow)
    local Label = arrow.Label or (arrow.label and unabbrev(arrow.label))
    local L = Label and "{"..Label.."}" or ""
    local p = arrow.placement and "|"..arrow.placement.."|" or ""
    local lplace = arrow.lplacement and arrow.lplacement.."{"..Label.."}"
    --
    -- 2026may24:
    L = diag_wrap(arrow.wrap_label, L)
    --
    local shape = arrow.shape or "->"
    local slide = arrow.slide and "@<"..arrow.slide..">"
    local curve = arrow.curve and "@/"..arrow.curve.."/"
    local modifier
    if slide or curve or lplace then
      modifier = (lplace or "")..(slide or "")..(curve or "")
    end
    if arrow.modifier then modifier = arrow.modifier end -- temp hack
    if modifier then
      sh = format("/{@{%s}%s}/", shape, modifier)
    else
      sh = "/"..shape.."/"
    end
    if lplace then p = "||"; L = "" end
    return p, sh, L
  end


-- New, based on:
-- (find-dn6 "diagforth.lua" "arrow-modifiers")
forths = forths or {}  -- for tests
forths[".arrowColor="] = function ()
    local Color = getword() or error()
    ds:pick(0).wrap_morphism = "\\Color"..Color.."{%s}%%"
    ds:pick(0).wrap_label    = "\\ColorBlack{%s}"
    ds:pick(0).wrap_from     = "\\ColorBlack{%s}"
    ds:pick(0).wrap_to       = "\\ColorBlack{%s}"
  end




--[[
 (eepitch-lua51)
 (eepitch-kill)
 (eepitch-lua51)
dofile "DiagTeX1.lua"

--]]



-- (defun e () (interactive) (find-angg "LUA/DiagTeX1.lua"))



-- Local Variables:
-- coding:  utf-8-unix
-- End: