Executing fc-cache if necessary (to be tested further)

1 files changed, 35 insertions, 7 deletions

diff --git a/update-luatex-font-database.lua b/update-luatex-font-database.lua
index 2ba4849..6b68e68 100644
--- a/update-luatex-font-database.lua
+++ b/update-luatex-font-database.lua
@@ -36,6 +36,9 @@ Valid options:
   -vvv                       print all steps of directory searching
   -V --version               prints the version and exits
   -h --help                  prints this message
+  --fc-cache                 run fc-cache before updating database
+                             (default is to run it if available)
+  --no-fc-cache              do not run fc-cache
   --sys                      writes the database for the whole system
                              (default is only for the user)
 
@@ -55,20 +58,40 @@ end
 ]]
 
 local long_opts = {
-    dbdir   = "d",
-    quiet   = "q",
-    verbose = 1,
-    version = "V",
-    help    = "h",
-    sys     = 0,
+    dbdir    = "d",
+    quiet    = "q",
+    verbose  = 1,
+    version  = "V",
+    help     = "h",
+    sys      = 0,
+    ['fc-cache']    = 0,
+    ['no-fc-cache'] = 0,
 }
 
 local short_opts = "d:qvVh"
 
-local log_level = 1
+-- Function running fc-cache if needed.
+-- The argument is nil for default, 0 for no fc-cache and 1 for fc-cache.
+-- Default behaviour is to run fc-cache if available.
+local function do_run_fc_cache(c)
+    if c == 0 then return end
+    if not c then
+      -- TODO: detect if fc-cache is available
+    end
+    local toexec = 'fc-cache'
+    if system == 'windows' then
+        toexec = 'fc-cache.exe' -- TODO: to test on a non-cygwin Windows
+    end
+    luaotfload.fonts.log(1, 'Executing %s...\n', toexec)
+    os.execute(toexec)
+end
+
+-- a temporary variable, containing the command line option concerning fc-cache
+local run_fc_cache = nil
 
 local function process_cmdline()
     local opts, optind, optarg = alt_getopt.get_ordered_opts (arg, short_opts, long_opts)
+    local log_level = 1
     for i,v in ipairs(opts) do
         if     v == "q" then
             log_level = 0
@@ -86,6 +109,10 @@ local function process_cmdline()
             os.exit(0)
         elseif v == "d" then
             luaotfload.fonts.directory = optarg [i]
+        elseif v == "fc-cache" then
+            run_fc_cache = 1
+        elseif v == "no-fc-cache" then
+            run_fc_cache = 0
         elseif v == "sys" then
             luaotfload.fonts.directory = kpse.expand_var("$TEXMFSYSVAR") .. "/tex/"
         end
@@ -94,4 +121,5 @@ local function process_cmdline()
 end
 
 process_cmdline()
+do_run_fc_cache(run_fc_cache)
 luaotfload.fonts.generate()