From 05e014ba69d57c18c460e0d0e12a7802d9c58225 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg42.2a@gmail.com>
Date: Fri, 26 Apr 2013 18:21:06 +0200
Subject: add ``flush-cache`` option to fontdbutil

---
 fontdbutil.lua          | 21 +++++++++++++++++++--
 luaotfload-database.lua | 33 +++++++++++++++++++--------------
 2 files changed, 38 insertions(+), 16 deletions(-)

diff --git a/fontdbutil.lua b/fontdbutil.lua
index 3c60eec..1aa99d0 100755
--- a/fontdbutil.lua
+++ b/fontdbutil.lua
@@ -126,6 +126,7 @@ This tool is part of the luaotfload package. Valid options are:
 
   -u --update                  update the database
   -f --force                   force re-indexing all fonts
+  -c --flush-cache             empty cache of font requests
 
   --find="font name"           query the database for a font name
   -F --fuzzy                   look for approximate matches if --find fails
@@ -214,7 +215,7 @@ set.
 --]]--
 
 local action_sequence = {
-    "loglevel", "help", "version", "generate", "query"
+    "loglevel", "help", "version", "flush", "generate", "query"
 }
 local action_pending  = table.tohash(action_sequence, false)
 
@@ -252,6 +253,19 @@ actions.generate = function (job)
     return false, false
 end
 
+actions.flush = function (job)
+    local success, fontnames = names.flush_cache()
+    if success then
+        local savedname = names.save(fontnames)
+        logs.names_report("info", 2, "cache",
+            "Cache emptied", #fontnames.mappings)
+        if savedname then
+            return true, true
+        end
+    end
+    return false, false
+end
+
 actions.query = function (job)
 
     local query = job.query
@@ -304,6 +318,7 @@ local process_cmdline = function ( ) -- unit -> jobspec
 
     local long_options = {
         alias            = 1,
+        ["flush-cache"]  = "c",
         find             = 1,
         force            = "f",
         fuzzy            = "F",
@@ -317,7 +332,7 @@ local process_cmdline = function ( ) -- unit -> jobspec
         version          = "V",
     }
 
-    local short_options = "fFiquvVh"
+    local short_options = "cfFiquvVh"
 
     local options, _, optarg =
         alt_getopt.get_ordered_opts (arg, short_options, long_options)
@@ -366,6 +381,8 @@ local process_cmdline = function ( ) -- unit -> jobspec
             result.show_info = true
         elseif v == "alias" then
             config.luaotfload.self = optarg[n]
+        elseif v == "c" then
+            action_pending["flush"] = true
         end
     end
 
diff --git a/luaotfload-database.lua b/luaotfload-database.lua
index 0c47bfd..7c6e657 100644
--- a/luaotfload-database.lua
+++ b/luaotfload-database.lua
@@ -69,7 +69,7 @@ fonts.definers       = fonts.definers or { }
 
 local names          = fonts.names
 
-names.version        = 2.201
+names.version        = 2.202
 names.data           = nil
 names.path           = {
     basename = "luaotfload-names.lua",
@@ -231,6 +231,7 @@ end
 
 --- define locals in scope
 local find_closest
+local flush_cache
 local font_fullinfo
 local load_names
 local read_fonts_conf
@@ -367,9 +368,10 @@ TODO:
  ×  3) make caching optional (via the config table) for debugging
  ×  4) make names_update() cache aware (nil if “force”)
  ×  5) add logging
-    6) add cache control to fontdbutil
-    7) incr db version
-    8) ???
+ ×  6) add cache control to fontdbutil
+ ×  7) incr db version
+    8) wishlist: save cache only at the end of a run
+    9) ???
     n) PROFIT!!!
 
 --doc]]--
@@ -508,12 +510,7 @@ font database created by the mkluatexfontdb script.
 ---
 
 resolve = function (_,_,specification) -- the 1st two parameters are used by ConTeXt
-    if not fonts_loaded then
-        print("=============")
-        print(names.data)
-        names.data   = load_names()
-        --os.exit()
-    end
+    if not fonts_loaded then names.data = load_names() end
     local data = names.data
 
     if specification.lookup == "file" then
@@ -1291,6 +1288,13 @@ local function scan_os_fonts(fontnames, newfontnames)
     return n_scanned, n_new
 end
 
+flush_cache = function (fontnames)
+    if not fontnames then fontnames = load_names() end
+    fontnames.request_cache = { }
+    collectgarbage"collect"
+    return true, fontnames
+end
+
 --- dbobj -> bool -> dbobj
 update_names = function (fontnames, force)
     local starttime = os.gettimeofday()
@@ -1376,10 +1380,11 @@ scan_external_dir = function (dir)
 end
 
 --- export functionality to the namespace “fonts.names”
-names.scan   = scan_external_dir
-names.load   = load_names
-names.update = update_names
-names.save   = save_names
+names.flush_cache   = flush_cache
+names.load          = load_names
+names.save          = save_names
+names.scan          = scan_external_dir
+names.update        = update_names
 
 names.resolve      = resolve --- replace the resolver from luatex-fonts
 names.resolvespec  = resolve
-- 
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