From fe0fde65f066d5e9a107a26eaec8fdbfe195f92e Mon Sep 17 00:00:00 2001
From: Khaled Hosny <khaledhosny@eglug.org>
Date: Fri, 26 Feb 2010 15:04:49 +0200
Subject: Checksum loaded fonts

Store checksums of already loaded fonts in the database to avoids
reloading them, this isn't much faster but it avoids reloading the fonts
and the huge memory consumption. Is there a faster way to hash a file?
---
 luaotfload-fonts.lua | 41 ++++++++++++++++++++++++++++++++---------
 otfl-font-dum.lua    |  2 +-
 2 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/luaotfload-fonts.lua b/luaotfload-fonts.lua
index a24b6c2..cca4f28 100644
--- a/luaotfload-fonts.lua
+++ b/luaotfload-fonts.lua
@@ -30,6 +30,10 @@ dofile(luaextra_file)
 local splitpath, expandpath, glob, basename = file.split_path, kpse.expand_path, dir.glob, file.basename
 local upper, format, rep = string.upper, string.format, string.rep
 
+function kpse.do_file(name)
+    return dofile(kpse.find_file(name))
+end
+
 -- the file name of the font database
 luaotfload.fonts.basename   = "otfl-names.lua"
 
@@ -42,7 +46,7 @@ luaotfload.fonts.directory = kpse.expand_var("$TEXMFVAR") .. luaotfload.fonts.su
 
 -- the version of the database, to be checked by the lookup function of
 -- luaotfload
-luaotfload.fonts.version    = 2.002
+luaotfload.fonts.version    = 2.003
 
 -- Log facilities:
 -- - level 0 is quiet
@@ -126,10 +130,17 @@ function fontloader.fullinfo(...)
 end
 
 local function load_font(filename, names, texmf)
-    log(3, "Loading font %s", filename)
-    local mappings = names.mappings
-    local families = names.families
+    log(3, "Loading font: %s", filename)
+    local mappings  = names.mappings  or { }
+    local families  = names.families  or { }
+    local checksums = names.checksums or { }
     if filename then
+        local checksum = file.checksum(filename)
+        if checksums[checksum] then
+            log(3, "Font already indexed: %s", filename)
+            return
+        end
+        checksums[checksum] = 1
         local info = fontloader.info(filename)
         if info then
             if type(info) == "table" and #info > 1 then
@@ -166,6 +177,9 @@ local function load_font(filename, names, texmf)
         else
             log(1, "Failed to load %s", filename)
         end
+    names.mappings  = names.mappings  or mappings
+    names.families  = names.families  or families
+    names.checksums = names.checksums or checksums
     end
 end
 
@@ -307,14 +321,23 @@ local function scan_os_fonts(names, scanned_fonts)
     end
 end
 
+local function fontnames_init()
+    return {
+        mappings  = { },
+        families  = { },
+        checksums = { },
+        version   = luaotfload.fonts.version,
+    }
+end
+
 -- The main function, scans everything and writes the file.
 local function generate()
     texio.write("luaotfload | Generating font names database.")
-    local fnames = {
-        mappings = { },
-        families = { },
-        version  = luaotfload.fonts.version,
-    }
+    local fnames = kpse.do_file(luaotfload.fonts.basename) or fontnames_init()
+    if fnames.version ~= luaotfload.fonts.version then
+        log(2, "Old font names database version, generating new one")
+        fnames = fontnames_init()
+    end
     local savepath = luaotfload.fonts.directory
     savepath = path_normalize(savepath)
     if not lfs.isdir(savepath) then
diff --git a/otfl-font-dum.lua b/otfl-font-dum.lua
index 5b83b3b..5c0d1ed 100644
--- a/otfl-font-dum.lua
+++ b/otfl-font-dum.lua
@@ -48,7 +48,7 @@ end
 
 fonts.names = fonts.names or { }
 
-fonts.names.version    = 2.002 -- not the same as in context
+fonts.names.version    = 2.003 -- not the same as in context
 fonts.names.basename   = "otfl-names.lua"
 fonts.names.new_to_old = { }
 fonts.names.old_to_new = { }
-- 
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