add FONTDIR env variable

to support custom font directory for EPUB documents

Now Koreader could find fonts in the "fonts" directory in the USB root
directory of kindle, Kobo and PocketBook devices, thus no need to copy
fonts to "koreader/fonts" directory.

frontend/document/credocument.lua

@@ -58,8 +58,8 @@ function CreDocument:engineInit()
         -- we need to initialize the CRE font list
         local fonts = Font:getFontList()
         for _k, _v in ipairs(fonts) do
-            if _v:sub(1, 4) ~= "urw/" then
+            if not _v:find("/urw/") then
-                local ok, err = pcall(cre.registerFont, Font.fontdir..'/'.._v)
+                local ok, err = pcall(cre.registerFont, _v)
                 if not ok then
                     DEBUG(err)
                 end

frontend/ui/font.lua

@@ -41,7 +41,7 @@ local Font = {
         [4] = "freefont/FreeSans.ttf",
     },
 
-    fontdir = os.getenv("FONTDIR") or "./fonts",
+    fontdir = "./fonts",
 
     -- face table
     faces = {},
@@ -77,23 +77,27 @@ function Font:getFace(font, size)
     return { size = size, orig_size = orig_size, ftface = face, hash = font..size }
 end
 
-function Font:_readList(target, dir, effective_dir)
+function Font:_readList(target, dir)
     for f in lfs.dir(dir) do
         if lfs.attributes(dir.."/"..f, "mode") == "directory" and f ~= "." and f ~= ".." then
-            self:_readList(target, dir.."/"..f, effective_dir..f.."/")
+            self:_readList(target, dir.."/"..f)
         else
             local file_type = string.lower(string.match(f, ".+%.([^.]+)") or "")
             if file_type == "ttf" or file_type == "ttc"
                 or file_type == "cff" or file_type == "otf" then
-                table.insert(target, effective_dir..f)
+                table.insert(target, dir.."/"..f)
             end
         end
     end
 end
 
 function Font:getFontList()
-    fontlist = {}
+    local fontlist = {}
-    self:_readList(fontlist, self.fontdir, "")
+    self:_readList(fontlist, self.fontdir)
+    -- multiple path should be joined with semicolon in FONTDIR env variable
+    for dir in string.gmatch(os.getenv("FONTDIR") or "", "([^;]+)") do
+        self:_readList(fontlist, dir)
+    end
     table.sort(fontlist)
     return fontlist
 end

platform/kindle/koreader.sh

@@ -115,6 +115,9 @@ export TESSDATA_PREFIX="data"
 # export dict directory
 export STARDICT_DATA_DIR="data/dict"
 
+# export font directory
+export FONTDIR="/mnt/us/fonts"
+
 logmsg "Setting up IPTables rules . . ."
 # accept input ports for zsync plugin
 iptables -A INPUT -i wlan0 -p udp --dport 5670 -j ACCEPT

platform/kobo/koreader.sh

@@ -21,6 +21,9 @@ export TESSDATA_PREFIX="data"
 # export dict directory
 export STARDICT_DATA_DIR="data/dict"
 
+# export font directory
+export FONTDIR="/mnt/onboard/fonts"
+
 # fast and dirty way of check if we are called from nickel
 # through fmon, or from another launcher (KSM or advboot)
 from_nickel=`pidof nickel | wc -c`

platform/pocketbook/koreader.app

@@ -21,6 +21,9 @@ export TESSDATA_PREFIX="data"
 # export dict directory
 export STARDICT_DATA_DIR="data/dict"
 
+# export font directory
+export FONTDIR="/mnt/ext1/fonts"
+
 if [ `echo $@ | wc -c` -eq 1 ]; then
     args="/mnt/ext1/"
 else