[fontloader] reorganize under the new import scheme

For better orientation, the fontloader tree now contains two
subdirectories into which files have been reorganized:

The two files required at runtime for the fontloader and luaotfload-tool
are:

      × ``fontloader-basics-gen.lua``
      × ``fontloader-fontloader.lua``

They are now kept in the ``src/fontloader/runtime/`` subdirectory.

All other files from upstream are now located in
``src/fontloader/misc``. This includes a number of files that have not
yet been part of Luaotfload. Currently, the *misc* set of files is not
packaged along with Luaotfload. This may change in the future when there
is an option to switch the merged fontloader for its constituent files,
or even for upstream.

1 files changed, 62 insertions, 0 deletions

diff --git a/src/fontloader/misc/fontloader-swiglib.lua b/src/fontloader/misc/fontloader-swiglib.lua
new file mode 100644
index 0000000..7ffcdc3
--- /dev/null
+++ b/src/fontloader/misc/fontloader-swiglib.lua
@@ -0,0 +1,62 @@
+if not modules then modules = { } end modules ['luatex-swiglib'] = {
+    version   = 1.001,
+    comment   = "companion to luatex-swiglib.tex",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local savedrequire = require
+
+local libsuffix = os.type == "windows" and ".dll" or ".so"
+
+function requireswiglib(required,version)
+    local library = package.loaded[required]
+    if library then
+        return library
+    else
+        local name = string.gsub(required,"%.","/") .. libsuffix
+        local list = kpse.show_path("clua")
+        for root in string.gmatch(list,"([^;]+)") do
+            local full = false
+            if type(version) == "string" and version ~= "" then
+                full = root .. "/" .. version .. "/" .. name
+                full = lfs.isfile(full) and full
+            end
+            if not full then
+                full = root .. "/" .. name
+                full = lfs.isfile(full) and full
+            end
+            if full then
+                local path, base = string.match(full,"^(.-)([^\\/]+)" .. libsuffix .."$")
+                local savedlibrary = package.loaded[base]
+                package.loaded[base] = nil
+                local savedpath = lfs.currentdir()
+                lfs.chdir(path)
+                library = package.loadlib(full,"luaopen_" .. base)
+                if type(library) == "function" then
+                    library = library()
+                    texio.write("<swiglib: '",required,"' is loaded>")
+                end
+                lfs.chdir(savedpath)
+                package.loaded[base] = savedlibrary
+                package.loaded[required] = library
+                return library
+            end
+        end
+        texio.write("<swiglib: '",name,"'is not found on '",list,"'")
+    end
+    texio.write("<swiglib: '",required,"' is not found>")
+end
+
+function require(name)
+    if string.find(name,"^swiglib%.") then
+        return requireswiglib(name)
+    else
+        return savedrequire(name)
+    end
+end
+
+function swiglib(name,version)
+    return requireswiglib("swiglib." .. name,version)
+end