1 files changed, 63 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/data-aux.lua b/tex/context/base/mkiv/data-aux.lua
new file mode 100644
index 000000000..dae96ce62
--- /dev/null
+++ b/tex/context/base/mkiv/data-aux.lua
@@ -0,0 +1,63 @@
+if not modules then modules = { } end modules ['data-aux'] = {
+    version   = 1.001,
+    comment   = "companion to luat-lib.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local find = string.find
+local type, next = type, next
+
+local trace_locating = false  trackers.register("resolvers.locating", function(v) trace_locating = v end)
+
+local resolvers = resolvers
+
+local report_scripts = logs.reporter("resolvers","scripts")
+
+function resolvers.updatescript(oldname,newname) -- oldname -> own.name, not per se a suffix
+ -- local scriptpath = "scripts/context/lua"
+    local scriptpath = "context/lua"
+    newname = file.addsuffix(newname,"lua")
+    local oldscript = resolvers.cleanpath(oldname)
+    if trace_locating then
+        report_scripts("to be replaced old script %a", oldscript)
+    end
+    local newscripts = resolvers.findfiles(newname) or { }
+    if #newscripts == 0 then
+        if trace_locating then
+            report_scripts("unable to locate new script")
+        end
+    else
+        for i=1,#newscripts do
+            local newscript = resolvers.cleanpath(newscripts[i])
+            if trace_locating then
+                report_scripts("checking new script %a", newscript)
+            end
+            if oldscript == newscript then
+                if trace_locating then
+                    report_scripts("old and new script are the same")
+                end
+            elseif not find(newscript,scriptpath) then
+                if trace_locating then
+                    report_scripts("new script should come from %a",scriptpath)
+                end
+            elseif not (find(oldscript,file.removesuffix(newname).."$") or find(oldscript,newname.."$")) then
+                if trace_locating then
+                    report_scripts("invalid new script name")
+                end
+            else
+                local newdata = io.loaddata(newscript)
+                if newdata then
+                    if trace_locating then
+                        report_scripts("old script content replaced by new content")
+                    end
+                    io.savedata(oldscript,newdata)
+                    break
+                elseif trace_locating then
+                    report_scripts("unable to load new script")
+                end
+            end
+        end
+    end
+end