1 files changed, 180 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/syst-lua.lua b/tex/context/base/mkiv/syst-lua.lua
new file mode 100644
index 000000000..422f57a00
--- /dev/null
+++ b/tex/context/base/mkiv/syst-lua.lua
@@ -0,0 +1,180 @@
+if not modules then modules = { } end modules ['syst-lua'] = {
+    version   = 1.001,
+    comment   = "companion to syst-lua.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local find, match = string.find, string.match
+local tonumber = tonumber
+local S, C, P, lpegmatch, lpegtsplitat = lpeg.S, lpeg.C, lpeg.P, lpeg.match, lpeg.tsplitat
+
+
+commands          = commands or { }
+local commands    = commands
+
+local implement   = interfaces.implement
+
+local two_strings = interfaces.strings[2]
+
+local context     = context
+local csprint     = context.sprint
+
+local prtcatcodes = tex.prtcatcodes
+
+implement { -- will b eoverloaded later
+    name      = "writestatus",
+    arguments = two_strings,
+    actions   = logs.status,
+}
+
+local ctx_firstoftwoarguments  = context.firstoftwoarguments  -- context.constructcsonly("firstoftwoarguments" )
+local ctx_secondoftwoarguments = context.secondoftwoarguments -- context.constructcsonly("secondoftwoarguments")
+local ctx_firstofoneargument   = context.firstofoneargument   -- context.constructcsonly("firstofoneargument"  )
+local ctx_gobbleoneargument    = context.gobbleoneargument    -- context.constructcsonly("gobbleoneargument"   )
+
+-- contextsprint(prtcatcodes,[[\ui_fo]]) -- ctx_firstofonearguments
+-- contextsprint(prtcatcodes,[[\ui_go]]) -- ctx_gobbleonearguments
+-- contextsprint(prtcatcodes,[[\ui_ft]]) -- ctx_firstoftwoarguments
+-- contextsprint(prtcatcodes,[[\ui_st]]) -- ctx_secondoftwoarguments
+
+function commands.doifelse(b)
+    if b then
+        ctx_firstoftwoarguments()
+-- csprint(prtcatcodes,[[\ui_ft]]) -- ctx_firstoftwoarguments
+    else
+        ctx_secondoftwoarguments()
+-- csprint(prtcatcodes,[[\ui_st]]) -- ctx_secondoftwoarguments
+    end
+end
+
+function commands.doifelsesomething(b)
+    if b and b ~= "" then
+        ctx_firstoftwoarguments()
+-- csprint(prtcatcodes,[[\ui_ft]]) -- ctx_firstoftwoarguments
+    else
+        ctx_secondoftwoarguments()
+-- csprint(prtcatcodes,[[\ui_st]]) -- ctx_secondoftwoarguments
+    end
+end
+
+function commands.doif(b)
+    if b then
+        ctx_firstofoneargument()
+-- context.__flushdirect(prtcatcodes,[[\ui_fo]]) -- ctx_firstofonearguments
+    else
+        ctx_gobbleoneargument()
+-- context.__flushdirect(prtcatcodes,[[\ui_go]]) -- ctx_gobbleonearguments
+    end
+end
+
+function commands.doifsomething(b)
+    if b and b ~= "" then
+        ctx_firstofoneargument()
+-- context.__flushdirect(prtcatcodes,[[\ui_fo]]) -- ctx_firstofonearguments
+    else
+        ctx_gobbleoneargument()
+-- context.__flushdirect(prtcatcodes,[[\ui_go]]) -- ctx_gobbleonearguments
+    end
+end
+
+function commands.doifnot(b)
+    if b then
+        ctx_gobbleoneargument()
+-- csprint(prtcatcodes,[[\ui_go]]) -- ctx_gobbleonearguments
+    else
+        ctx_firstofoneargument()
+-- csprint(prtcatcodes,[[\ui_fo]]) -- ctx_firstofonearguments
+    end
+end
+
+function commands.doifnotthing(b)
+    if b and b ~= "" then
+        ctx_gobbleoneargument()
+-- csprint(prtcatcodes,[[\ui_go]]) -- ctx_gobbleonearguments
+    else
+        ctx_firstofoneargument()
+-- csprint(prtcatcodes,[[\ui_fo]]) -- ctx_firstofonearguments
+    end
+end
+
+commands.testcase = commands.doifelse -- obsolete
+
+function commands.boolcase(b)
+    context(b and 1 or 0)
+end
+
+function commands.doifelsespaces(str)
+    if find(str,"^ +$") then
+        ctx_firstoftwoarguments()
+    else
+        ctx_secondoftwoarguments()
+    end
+end
+
+local pattern = lpeg.patterns.validdimen
+
+function commands.doifelsedimenstring(str)
+    if lpegmatch(pattern,str) then
+        ctx_firstoftwoarguments()
+    else
+        ctx_secondoftwoarguments()
+    end
+end
+
+local p_first = C((1-P(",")-P(-1))^0)
+
+implement {
+    name      = "firstinset",
+    arguments = "string",
+    actions   = function(str) context(lpegmatch(p_first,str or "")) end
+}
+
+implement {
+    name      = "ntimes",
+    arguments = { "string", "integer" },
+    actions   = { string.rep, context }
+}
+
+implement {
+    name      = "execute",
+    arguments = "string",
+    actions   = os.execute -- wrapped in sandbox
+}
+
+implement {
+    name      = "doifelsesame",
+    arguments = two_strings,
+    actions   = function(a,b)
+        if a == b then
+            ctx_firstoftwoarguments()
+        else
+            ctx_secondoftwoarguments()
+        end
+    end
+}
+
+implement {
+    name      = "doifsame",
+    arguments = two_strings,
+    actions   = function(a,b)
+        if a == b then
+            ctx_firstofoneargument()
+        else
+            ctx_gobbleoneargument()
+        end
+    end
+}
+
+implement {
+    name      = "doifnotsame",
+    arguments = two_strings,
+    actions   = function(a,b)
+        if a == b then
+            ctx_gobbleoneargument()
+        else
+            ctx_firstofoneargument()
+        end
+    end
+}