"beelines" solution -- texlive 2017

Question

This beelines text gradient solution worked until I updated to texlive 2017. Sadly it no longer seems to work.

Beelines Solution

The MWE below depends on two LuaTex files:

Files created by Philipp Gesang

I tried the fix for texlive 2016, beelines 2016 fix but that did not work. Instead of the marvelously colored text I get the following:

MWE:

 \RequirePackage{luatex85}
\documentclass {scrartcl}
\usepackage {fontspec} %% this loads luaotfload as well
\setmainfont {Antykwa Poltawskiego}
\usepackage{luatexbase}
\input beegradients.tex

\definegradientgroup [red-green-blue][255*0*0, 0*255*0, 0*0*255]

\begin {document}
  \startbeegradients [red-green-blue]
     A large rose-tree stood near the entrance of the garden: the roses growing on it were white, but there were three gardeners at it, busily painting them red. Alice thought this a very curious thing, and she went nearer to watch them, and just as she came up to them she heard one of them say, `Look out now, Five! Don't go splashing paint over me like that!'
  \stopbeegradients
\end {document}

Log file:

This is LuaTeX, Version 1.0.4 (TeX Live 2017)  (format=lualatex 2017.12.17)  23 DEC 2017 09:57
 restricted system commands enabled.
**beelinestesting.tex
(./beelinestesting.tex
LaTeX2e <2017-04-15>
Lua module: luaotfload-main 2017/01/29 2.80001 OpenType layout system.
Lua module: lualibs 2017-02-01 2.5 ConTeXt Lua standard libraries.
Lua module: lualibs-extended 2017-02-01 2.5 ConTeXt Lua libraries -- extended co
llection.(using write cache: /home/aaron/.texlive2017/texmf-var/luatex-cache/gen
eric)(using read cache: /usr/local/texlive/2017/texmf-var/luatex-cache/generic /
home/aaron/.texlive2017/texmf-var/luatex-cache/generic)
luaotfload | conf : Root cache directory is /home/aaron/.texlive2017/texmf-var/l
uatex-cache/generic/names.
luaotfload | init : Loading fontloader “fontloader-2017-02-11.lua” from kpse
-resolved path “/usr/local/texlive/2017/texmf-dist/tex/luatex/luaotfload/fontl
oader-2017-02-11.lua”.
Lua-only attribute luaotfload@state = 1
Lua-only attribute luaotfload@noligature = 2
Lua-only attribute luaotfload@syllabe = 3
luaotfload | init : Context OpenType loader version “3.027”
Inserting `luaotfload.node_processor' at position 1 in `pre_linebreak_filter'.
Inserting `luaotfload.node_processor' at position 1 in `hpack_filter'.
Inserting `luaotfload.define_font' at position 1 in `define_font'.
Lua-only attribute luaotfload_color_attribute = 4
luaotfload | conf : Root cache directory is /home/aaron/.texlive2017/texmf-var/l
uatex-cache/generic/names.
Inserting `luaotfload.aux.set_sscale_dimens' at position 1 in `luaotfload.patch_
font'.
Inserting `luaotfload.aux.patch_cambria_domh' at position 2 in `luaotfload.patch
_font'.
Inserting `luaotfload.aux.fixup_fontdata' at position 1 in `luaotfload.patch_fon
t_unsafe'.
Inserting `luaotfload.aux.set_capheight' at position 3 in `luaotfload.patch_font
'.
Inserting `luaotfload.rewrite_fontname' at position 4 in `luaotfload.patch_font'
.
luaotfload | main : initialization completed in 0.090 seconds
Babel <3.15> and hyphenation patterns for 1 language(s) loaded.
(/usr/local/texlive/2017/texmf-dist/tex/generic/luatex85/luatex85.sty
Package: luatex85 2016/06/15 v1.4 pdftex aliases for luatex
)
(/usr/local/texlive/2017/texmf-dist/tex/latex/koma-script/scrartcl.cls
Document Class: scrartcl 2017/09/07 v3.24 KOMA-Script document class (article)
(/usr/local/texlive/2017/texmf-dist/tex/latex/koma-script/scrkbase.sty
Package: scrkbase 2017/09/07 v3.24 KOMA-Script package (KOMA-Script-dependent ba
sics and keyval usage)

(/usr/local/texlive/2017/texmf-dist/tex/latex/koma-script/scrbase.sty
Package: scrbase 2017/09/07 v3.24 KOMA-Script package (KOMA-Script-independent b
asics and keyval usage)

(/usr/local/texlive/2017/texmf-dist/tex/latex/graphics/keyval.sty
Package: keyval 2014/10/28 v1.15 key=value parser (DPC)
\KV@toks@=\toks14
)
(/usr/local/texlive/2017/texmf-dist/tex/latex/koma-script/scrlfile.sty
Package: scrlfile 2017/09/07 v3.24 KOMA-Script package (loading files)
)))
(/usr/local/texlive/2017/texmf-dist/tex/latex/koma-script/tocbasic.sty
Package: tocbasic 2017/09/07 v3.24 KOMA-Script package (handling toc-files)
\scr@dte@tocline@numberwidth=\skip41
\scr@dte@tocline@numbox=\box26
)
Package tocbasic Info: omitting babel extension for `toc'
(tocbasic)             because of feature `nobabel' available
(tocbasic)             for `toc' on input line 133.
Package tocbasic Info: omitting babel extension for `lof'
(tocbasic)             because of feature `nobabel' available
(tocbasic)             for `lof' on input line 135.
Package tocbasic Info: omitting babel extension for `lot'
(tocbasic)             because of feature `nobabel' available
(tocbasic)             for `lot' on input line 136.
Class scrartcl Info: File `scrsize11pt.clo' used instead of
(scrartcl)           file `scrsize11.clo' to setup font sizes on input line 2080
.

(/usr/local/texlive/2017/texmf-dist/tex/latex/koma-script/scrsize11pt.clo
File: scrsize11pt.clo 2017/09/07 v3.24 KOMA-Script font size class option (11pt)

luaotfload | db : Font names database loaded from /home/aaron/.texlive2017/texmf
-var/luatex-cache/generic/names/luaotfload-names.luc(load luc: /home/aaron/.texl
ive2017/texmf-var/luatex-cache/generic/fonts/otl/lmroman10-regular.luc))
(/usr/local/texlive/2017/texmf-dist/tex/latex/koma-script/typearea.sty
Package: typearea 2017/09/07 v3.24 KOMA-Script package (type area)
\ta@bcor=\skip42
\ta@div=\count79
\ta@hblk=\skip43
\ta@vblk=\skip44
\ta@temp=\skip45
\footheight=\skip46
Package typearea Info: These are the values describing the layout:
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(typearea)             BCOR = 0.0pt
(typearea)             \paperwidth      = 597.50793pt
(typearea)              \textwidth      = 418.25555pt
(typearea)              DIV departure   = -6%
(typearea)              \evensidemargin = 17.3562pt
(typearea)              \oddsidemargin  = 17.3562pt
(typearea)             \paperheight     = 845.04694pt
(typearea)              \textheight     = 595.80026pt
(typearea)              \topmargin      = -25.16531pt
(typearea)              \headheight     = 17.0pt
(typearea)              \headsep        = 20.40001pt
(typearea)              \topskip        = 11.0pt
(typearea)              \footskip       = 47.6pt
(typearea)              \baselineskip   = 13.6pt
(typearea)              on input line 1686.
)
\c@part=\count80
\c@section=\count81
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\c@paragraph=\count84
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\scr@dte@section@maxnumwidth=\skip48
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\scr@dte@subsubsection@maxnumwidth=\skip50
\scr@dte@paragraph@maxnumwidth=\skip51
\scr@dte@subparagraph@maxnumwidth=\skip52
LaTeX Info: Redefining \textsubscript on input line 4161.
\abovecaptionskip=\skip53
\belowcaptionskip=\skip54
\c@pti@nb@sid@b@x=\box27
\c@figure=\count86
\c@table=\count87
Class scrartcl Info: Redefining `\numberline' on input line 5319.
\bibindent=\dimen102
)
(/usr/local/texlive/2017/texmf-dist/tex/latex/fontspec/fontspec.sty
(/usr/local/texlive/2017/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
(/usr/local/texlive/2017/texmf-dist/tex/latex/l3kernel/expl3.sty
Package: expl3 2017/12/16 L3 programming layer (loader) 

(/usr/local/texlive/2017/texmf-dist/tex/latex/l3kernel/expl3-code.tex
Package: expl3 2017/12/16 L3 programming layer (code)
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(/usr/local/texlive/2017/texmf-dist/tex/latex/l3kernel/l3pdfmode.def
File: l3pdfmode.def 2017/03/18 v L3 Experimental driver: PDF mode
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))
Package: xparse 2017/12/16 L3 Experimental document command parser
\l__xparse_current_arg_int=\count170
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\l__xparse_v_nesting_int=\count174
)
Package: fontspec 2017/11/09 v2.6g Font selection for XeLaTeX and LuaLaTeX
Lua module: fontspec 2017/11/09 2.6g Font selection for XeLaTeX and LuaLaTeX
(/usr/local/texlive/2017/texmf-dist/tex/latex/fontspec/fontspec-luatex.sty
Package: fontspec-luatex 2017/11/09 v2.6g Font selection for XeLaTeX and LuaLaTe
X
\l__fontspec_script_int=\count175
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\g__file_internal_ior=\read1

Had to cut the log some because of character limits.

(/usr/local/texlive/2017/texmf-dist/tex/latex/base/fontenc.sty
Package: fontenc 2017/04/05 v2.0i Standard LaTeX package

(/usr/local/texlive/2017/texmf-dist/tex/latex/base/tuenc.def
File: tuenc.def 2017/04/05 v2.0i Standard LaTeX file
LaTeX Font Info:    Redeclaring font encoding TU on input line 82.
))
.................................................
 >"AntykwaPoltawskiego/I:mode=node;script=latn;language=DFLT;+tlig;"
    . - 'italic small caps'  (m/itsc) with NFSS spec.:
    . <->"AntykwaPoltawskiego/I:mode=node;script=latn;language=DFLT;+tlig;+smcp;"
    . - 'bold italic' (bx/it) with NFSS spec.:
    . <->"AntykwaPoltawskiego/BI:mode=node;script=latn;language=DFLT;+tlig;"
    . - 'bold italic small caps'  (bx/itsc) with NFSS spec.:
    . <->"AntykwaPoltawskiego/BI:mode=node;script=latn;language=DFLT;+tlig;+smcp;"
    .................................................
    LaTeX Info: Redefining \rmfamily on input line 4.

(/usr/local/texlive/2017/texmf-dist/tex/luatex/luatexbase/luatexbase.sty
Package: luatexbase 2015/10/04 v1.3 luatexbase interface to LuaTeX 

(/usr/local/texlive/2017/texmf-dist/tex/luatex/ctablestack/ctablestack.sty
Package: ctablestack 2015/10/01 v1.0 Catcode table stable support
\@catcodetablestackcnt=\count184
)
\CatcodeTableOther=\catcodetable6
\CatcodeTableExpl=\catcodetable7
)
(/usr/local/texlive/2017/texmf-dist/tex/generic/beegradients/beegradients.tex
Lua module: beegradients 2013-09-07 17:03:42+0200 42)
(./beelinestesting.aux)
\openout1 = beelinestesting.aux

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 10.
LaTeX Font Info:    ... okay on input line 10.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 10.
LaTeX Font Info:    ... okay on input line 10.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 10.
LaTeX Font Info:    ... okay on input line 10.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 10.
LaTeX Font Info:    ... okay on input line 10.
LaTeX Font Info:    Checking defaults for TU/lmr/m/n on input line 10.
LaTeX Font Info:    ... okay on input line 10.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 10.
LaTeX Font Info:    ... okay on input line 10.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 10.
LaTeX Font Info:    ... okay on input line 10.
.................................................
. fontspec info: "setup-math"
. 
. Adjusting the maths setup (use [no-math] to avoid this).
.................................................
\symlegacymaths=\mathgroup4
LaTeX Font Info:    Overwriting symbol font `legacymaths' in version `bold'
(Font)                  OT1/cmr/m/n --> OT1/cmr/bx/n on input line 10.
LaTeX Font Info:    Redeclaring math accent \acute on input line 10.
LaTeX Font Info:    Redeclaring math accent \grave on input line 10.
LaTeX Font Info:    Redeclaring math accent \ddot on input line 10.
LaTeX Font Info:    Redeclaring math accent \tilde on input line 10.
LaTeX Font Info:    Redeclaring math accent \bar on input line 10.
LaTeX Font Info:    Redeclaring math accent \breve on input line 10.
LaTeX Font Info:    Redeclaring math accent \check on input line 10.
LaTeX Font Info:    Redeclaring math accent \hat on input line 10.
LaTeX Font Info:    Redeclaring math accent \dot on input line 10.
LaTeX Font Info:    Redeclaring math accent \mathring on input line 10.
LaTeX Font Info:    Redeclaring math symbol \colon on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Gamma on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Delta on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Theta on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Lambda on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Xi on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Pi on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Sigma on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Upsilon on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Phi on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Psi on input line 10.
LaTeX Font Info:    Redeclaring math symbol \Omega on input line 10.
LaTeX Font Info:    Redeclaring math symbol \mathdollar on input line 10.
LaTeX Font Info:    Redeclaring symbol font `operators' on input line 10.
LaTeX Font Info:    Encoding `OT1' has changed to `TU' for symbol font
(Font)              `operators' in the math version `normal' on input line 10.
LaTeX Font Info:    Overwriting symbol font `operators' in version `normal'
(Font)                  OT1/cmr/m/n --> TU/AntykwaPoltawskiego(0)/m/n on input l
ine 10.
LaTeX Font Info:    Encoding `OT1' has changed to `TU' for symbol font
(Font)              `operators' in the math version `bold' on input line 10.
LaTeX Font Info:    Overwriting symbol font `operators' in version `bold'
(Font)                  OT1/cmr/bx/n --> TU/AntykwaPoltawskiego(0)/m/n on input 
line 10.
LaTeX Font Info:    Overwriting symbol font `operators' in version `normal'
(Font)                  TU/AntykwaPoltawskiego(0)/m/n --> TU/AntykwaPoltawskiego
(0)/m/n on input line 10.
LaTeX Font Info:    Overwriting math alphabet `\mathit' in version `normal'
(Font)                  OT1/cmr/m/it --> TU/AntykwaPoltawskiego(0)/m/it on input
 line 10.
LaTeX Font Info:    Overwriting math alphabet `\mathbf' in version `normal'
(Font)                  OT1/cmr/bx/n --> TU/AntykwaPoltawskiego(0)/bx/n on input
 line 10.
LaTeX Font Info:    Overwriting math alphabet `\mathsf' in version `normal'
(Font)                  OT1/cmss/m/n --> TU/lmss/m/n on input line 10.
LaTeX Font Info:    Overwriting math alphabet `\mathtt' in version `normal'
(Font)                  OT1/cmtt/m/n --> TU/lmtt/m/n on input line 10.
LaTeX Font Info:    Overwriting symbol font `operators' in version `bold'
(Font)                  TU/AntykwaPoltawskiego(0)/m/n --> TU/AntykwaPoltawskiego
(0)/bx/n on input line 10.
LaTeX Font Info:    Overwriting math alphabet `\mathit' in version `bold'
(Font)                  OT1/cmr/bx/it --> TU/AntykwaPoltawskiego(0)/bx/it on inp
ut line 10.
LaTeX Font Info:    Overwriting math alphabet `\mathsf' in version `bold'
(Font)                  OT1/cmss/bx/n --> TU/lmss/bx/n on input line 10.
LaTeX Font Info:    Overwriting math alphabet `\mathtt' in version `bold'
(Font)                  OT1/cmtt/m/n --> TU/lmtt/bx/n on input line 10.

! Undefined control sequence.
\startbeegradients ->\lltxb@ifnextchar 
                                       [\startbeegradientsindeed {\startbeeg...
l.11   \startbeegradients
                        [red-green-blue]
? 
! Use of \startbeegradientsindeed doesn't match its definition.
\startbeegradients ... [\startbeegradientsindeed {
                                                  \startbeegradientsindeed []}
l.11   \startbeegradients
                        [red-green-blue]
? 
Module beegradients Warning: Cannot inject node processor: no gradient group def
ined. on input line 11
! Too many }'s.
\startbeegradients ...\startbeegradientsindeed []}

l.11   \startbeegradients
                        [red-green-blue]
? 
[1

{/usr/local/texlive/2017/texmf-var/fonts/map/pdftex/updmap/pdftex.map}]
(./beelinestesting.aux))

Here is how much of LuaTeX's memory you used:
 11971 strings out of 494483
 100000,552014 words of node,token memory allocated
 413 words of node memory still in use:
   3 hlist, 1 vlist, 1 rule, 2 glue, 5 attribute, 53 glue_spec, 5 attribute_list
, 1 write, 1 pdf_literal nodes
   avail lists: 2:21,3:4,4:4,5:25,6:319,7:84,8:1,9:12,10:3,11:13
 15973 multiletter control sequences out of 65536+600000
 30 fonts using 6586047 bytes
 46i,6n,67p,8880b,238s stack positions out of 5000i,500n,10000p,200000b,100000s
</usr/local/texlive/2017/texmf-dist/fonts/opentype/gust/poltawski/antpolt-regula
r.otf>
Output written on beelinestesting.pdf (1 page, 5565 bytes).

PDF statistics: 15 PDF objects out of 1000 (max. 8388607)
 8 compressed objects within 1 object stream
 0 named destinations out of 1000 (max. 131072)
 1 words of extra memory for PDF output out of 10000 (max. 100000000)

Any help in getting this to work would be greatly appreciated. Thanks!!

Answer 1

The node subtype for pdf literal is 16 not 8 these days. (Probably it ought to get the number by name, rather than rely on the internal numbers, but here I just changed 8 to 16.)

your test file

\RequirePackage{luatex85}
\documentclass {scrartcl}
\usepackage {fontspec} %% this loads luaotfload as well
\setmainfont {Antykwa Poltawskiego}
\usepackage{luatexbase}

\makeatletter
%\def\RequireLuaModule#1{\directlua{require("#1")}}
\let\lltxb@ifnextchar\@ifnextchar
\makeatother

\input beegradients.tex

\definegradientgroup [red-green-blue][255*0*0, 0*255*0, 0*0*255]

\begin {document}
  \startbeegradients [red-green-blue]
     A large rose-tree stood near the entrance of the garden: the roses growing on it were white, but there were three gardeners at it, busily painting them red. Alice thought this a very curious thing, and she went nearer to watch them, and just as she came up to them she heard one of them say, `Look out now, Five! Don't go splashing paint over me like that!'
  \stopbeegradients
\end {document}

lua code

packagedata               = packagedata or { }
packagedata.beegradients  = { }
local beegradients        = packagedata.beegradients

local processorid         = "beegradients" --- name of callback

local err, warn, info
if luatexbase then
  err, warn, info = luatexbase.provides_module {
    name          = "beegradients",
    version       = 42,
    date          = "2013-09-07 17:03:42+0200",
    descriptions  = "http://tex.stackexchange.com/q/131883/14066",
    author        = "Philipp Gesang",
    copyright     = "Philipp Gesang",
    license       = "BSD 2 clause",
  }
end

local lpeg                = require "lpeg"
local C, Cf, Cg, Ct       = lpeg.C, lpeg.Cf, lpeg.Cg, lpeg.Ct
local P, R, S             = lpeg.P, lpeg.R, lpeg.S
local lpegmatch           = lpeg.match

local unpack              = unpack or table.unpack

local stringformat        = string.format
local stringis_empty      = string.is_empty
local tableswapped        = table.swapped

local nodes               = nodes
local nodecodes           = nodes.nodecodes or tableswapped (node.types ())
local hlist_t             = nodecodes.hlist
local vlist_t             = nodecodes.vlist
local glyph_t             = nodecodes.glyph
local disc_t              = nodecodes.disc
local whatsit_t           = nodecodes.whatsit
local pdf_literal_t       = 16

local traversenodes       = node.traverse
local traversenodetype    = node.traverse_id
local countnodes          = node.count
local newnode             = node.new
local copynode            = node.copy
local insertnodebefore    = node.insert_before
local insertnodeafter     = node.insert_after

require "lualibs" --- requires extended set including util-prs.lua

local settingstoarray     = utilities and utilities.parsers.settings_to_array

if not settingstoarray then --- old Lualibs

  local comma      = P","
  local spacechar  = S" \f\n\r\t\v"
  local separator  = comma * spacechar^0
  local item       = C((1 - comma - spacechar)^1)
  local p_settings = spacechar^0
                   * item
                   * (separator * item)^0
                   * (separator + spacechar^0)

  settingstoarray = function (settings)
    return lpegmatch (Ct (p_settings), settings)
  end

end

local practically_zero = 0.003921568627451
local practically_one  = 0.99607843137255

local parse_gradient do

  local tonumber16 = function (n) return tonumber (n, 16) end

  local digit       = R"09"
  local hexdigit    = R("09", "af", "AF")
  local dash        = P"-"
  local colon       = P":"
  local asterisk    = P"*"
  --- values:
  --- hexcolor    -> 0xf00ba7         (triplet of hex octets, r->g->b)
  --- deccolor    -> 123*44*111       (triplet of decimal octets: r->g->b)
  --- speccolor   -> r:210*g:32*b:145 (prefixed octets, any order)
  local hexcolor    = Ct (P"0x" * Cg (hexdigit * hexdigit / tonumber16, "r")
                                * Cg (hexdigit * hexdigit / tonumber16, "g")
                                * Cg (hexdigit * hexdigit / tonumber16, "b"))
  local decexp      = digit * digit^-1 * digit^-1
  local deccolor    = Ct (Cg (decexp / tonumber, "r") * asterisk
                        * Cg (decexp / tonumber, "g") * asterisk
                        * Cg (decexp / tonumber, "b"))
  local specexp     = C(S"rgb") * colon * (C(decexp) / tonumber)
  local speccolor   = Cf (Ct ""
                        * Cg (specexp) * asterisk
                        * Cg (specexp) * asterisk
                        * Cg (specexp),
                        rawset)
  local colexp      = hexcolor + deccolor + speccolor

  local zero        = { 0, 0, 0 } --- fallback

  --- string -> float * float * float

  parse_color = function (raw)
    local color = lpegmatch (colexp, raw)

    local r = color.r / 255
    local g = color.g / 255
    local b = color.b / 255

    if r < practically_zero then r = 0 end
    if r > practically_one  then r = 1 end

    if g < practically_zero then g = 0 end
    if g > practically_one  then g = 1 end

    if b < practically_zero then b = 0 end
    if b > practically_one  then b = 1 end

    return { r, g, b }
  end

end



local gradients = { } --- (float * float * float) list

--- string -> unit

local definegradients = function (groupid, raw)

  local group         = gradients [groupid]
  if group then
    warn (stringformat ("Gradient group %q already defined, redefining.",
                        groupid))
  else
    group = { }
  end

  local definitions   = settingstoarray (raw)

  if #definitions < 1 then
    warn (stringformat ("Need at least one definition in gradient group %q, skipping.",
                        groupid))
    return nil
  end

  for i = 1, #definitions do
    local definition = definitions [i]
    if definition and not stringis_empty (definition) then
      group [#group + 1] = parse_color (definition)
    end
  end

  gradients [groupid] = group
end

beegradients.define = definegradients



local pdf_literal = newnode(whatsit_t, pdf_literal_t)

local get_colornode = function (r, g, b)
  local push, pop = copynode (pdf_literal), copynode (pdf_literal)
  local pushcolor = stringformat ("%.3g %.3g %.3g rg", r, g, b)
  local popcolor  = "0 g"
  push.mode, push.data = 1, pushcolor
  pop.mode,  pop.data  = 1, popcolor
  return push, pop
end

--- more accurate, recursive glyph counter than node.count;
--- this includes, for instance, the lowered -Y´E¡ in \TeX
--- node_t -> int? -> int

local countglyphs countglyphs = function (hd, cnt)
  cnt = cnt or 0
  for n in traversenodes (hd) do
    local nid = n.id
    if nid == glyph_t or nid == disc_t then
      cnt = cnt + 1
    elseif nid == hlist_t or nid == vlist_t then
      cnt = countglyphs (n.list, cnt)
    end
  end

  return cnt
end

--- node_t -> float -> float -> float ->
--         -> float -> float -> float -> node_t

local colorize_glyphs colorize_glyphs = function (hd, done,
                                                  r, g, b,
                                                  rstep, gstep, bstep)

  local cur = hd

  while cur do
    local id = cur.id

    if id == glyph_t or id == disc_t then

      local before, after       = get_colornode (r, g, b)
      local curprev, curnext    = cur.prev, cur.next

      before.next, cur.prev     = cur, before
      after.prev, cur.next      = cur, after

      if not curprev then --- first
        hd = before
      else
        before.prev, curprev.next = curprev, before
      end

      if curnext then
        after.next, curnext.prev  = curnext, after
      end -- else last node

      done = done + 1
      cur  = curnext

      if cur then
        r = r + rstep
        g = g + gstep
        b = b + bstep

        --- safeguard against rounding

        if r < practically_zero then r = 0 end
        if r > practically_one  then r = 1 end

        if g < practically_zero then g = 0 end
        if g > practically_one  then g = 1 end

        if b < practically_zero then b = 0 end
        if b > practically_one  then b = 1 end
      end

    elseif id == hlist_t or id == vlist_t then

      local list = cur.list
      if list then
        cur.list, done = colorize_glyphs (cur.list, done,
                                          r, g, b,
                                          rstep, gstep, bstep)
      end

      cur   = cur.next

    else

      cur   = cur.next

    end

  end

  --print (stringformat ("final>  %.3f %.3f %.3f -A× %d", r, g, b, done))

  return hd, done
end

local lineprocessor = function (hd, from, to)

  local list    = hd.list
  local nglyphs = countglyphs (list)
  local nsteps  = nglyphs - 1

  local rstart, gstart, bstart = unpack (from)

  local rstep = (to [1] - rstart) / nsteps
  local gstep = (to [2] - gstart) / nsteps
  local bstep = (to [3] - bstart) / nsteps

  --print (stringformat ("from>   %.3f %.3f %.3f", rstart, gstart, bstart))
  --print (stringformat ("to>     %.3f %.3f %.3f", to [1], to [2], to [3]))
  --print (stringformat ("step>   %.3f %.3f %.3f × %d", rstep,  gstep,  bstep, nglyphs))
  --print (">>", nglyphs, countnodes (glyph_t, list), from, to)

  local glyphs_done
  hd.list, glyphs_done = colorize_glyphs  (list, 0,
                                           rstart, gstart, bstart,
                                           rstep,  gstep,  bstep)
  --print (">>", nglyphs, glyphs_done, from, to)
end

local currentgroup
local currentgradient = 1

local processor = function (hd)
  local group       = gradients [currentgroup]
  local ngradients  = #group

  if not group then
    warn (stringformat ("No such gradient group: %q, bailing out.",
                        currentgroup))
    return hd
  end

  for line in traversenodetype (hlist_t, hd) do

    local fromcolor = group [currentgradient]

    currentgradient = currentgradient + 1
    if currentgradient > ngradients then
      currentgradient = 1
    end

    local tocolor   = group [currentgradient]

    lineprocessor (line, fromcolor, tocolor)

  end

  return hd
end

local active = false

local enable = function (groupid)

  if not stringis_empty (groupid) then
    if currentgroup ~= groupid then -- reset gradient pointer
      currentgradient = 1
    end
    currentgroup = groupid
  end

  if currentgroup == nil then
    warn "Cannot inject node processor: no gradient group defined."
    return
  end

  if active == false then

    info (stringformat ("Injecting node processor, active group %q.",
                        currentgroup))
    luatexbase.add_to_callback ("post_linebreak_filter",
                                processor,
                                processorid)
    active = true
  end

end

local disable = function ()

  if active == true then
    info "Removing node processor."
    luatexbase.remove_from_callback ("post_linebreak_filter",
                                     processorid)
    active = false
  end

end

beegradients.enable     = enable
beegradients.disable    = disable