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1if not modules then modules = { } end modules ['strc-itm'] = {
2    version   = 1.001,
3    comment   = "companion to strc-itm.mkiv",
4    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
5    copyright = "PRAGMA ADE / ConTeXt Development Team",
6    license   = "see context related readme files"
7}
8
9local structures  = structures
10local itemgroups  = structures.itemgroups
11local jobpasses   = job.passes
12
13local implement   = interfaces.implement
14
15local setvariable = jobpasses.save
16local getvariable = jobpasses.getfield
17
18local texsetcount = tex.setcount
19local texsetdimen = tex.setdimen
20
21local f_stamp     = string.formatters["itemgroup:%s:%s"]
22local counts      = table.setmetatableindex("number")
23
24-- We keep the counter at the Lua end so we can group the items within
25-- an itemgroup which in turn makes for less passes when one itemgroup
26-- entry is added or removed.
27
28local trialtypesetting = context.trialtypesetting
29
30local function analyzeitemgroup(name,level)
31    local n = counts[name]
32    if level == 1 then
33        n = n + 1
34        counts[name] = n
35    end
36    local stamp = f_stamp(name,n)
37    local n = getvariable(stamp,level,1,0)
38    local w = getvariable(stamp,level,2,0)
39    texsetcount("c_strc_itemgroups_max_items",n)
40    texsetdimen("d_strc_itemgroups_max_width",w)
41end
42
43local function registeritemgroup(name,level,nofitems,maxwidth)
44    local n = counts[name]
45    if not trialtypesetting() then
46        -- no trialtypsetting
47        setvariable(f_stamp(name,n), { nofitems, maxwidth }, level)
48    elseif level == 1 then
49        counts[name] = n - 1
50    end
51end
52
53implement {
54    name      = "analyzeitemgroup",
55    actions   = analyzeitemgroup,
56    arguments = { "string", "integer" }
57}
58
59implement {
60    name      = "registeritemgroup",
61    actions   = registeritemgroup,
62    arguments = { "string", "integer", "integer", "dimen" }
63}
64