2 files changed, 39 insertions, 1 deletions
diff --git a/src/luaotfload-database.lua b/src/luaotfload-database.lua
index a369d8e..e4188dc 100644
--- a/src/luaotfload-database.lua
+++ b/src/luaotfload-database.lua
@@ -2953,7 +2953,7 @@ end
 
 --- int -> string
 local nth_font_filename = function (n)
-    report ("info", 4, "db", "Picking the %d font file.", n)
+    report ("info", 4, "db", "Picking font file no. %d.", n)
     if not p_blacklist then
         read_blacklist ()
     end
@@ -2961,6 +2961,25 @@ local nth_font_filename = function (n)
     return filenames[n] and filenames[n][1] or "<error>"
 end
 
+--[[doc--
+
+    font_slice -- Return the fonts in the range from lo to hi.
+
+--doc]]--
+
+local font_slice = function (lo, hi)
+    report ("info", 4, "db", "Retrieving font files nos. %d--%d.", lo, hi)
+    if not p_blacklist then
+        read_blacklist ()
+    end
+    local filenames = collect_font_filenames ()
+    local result    = { }
+    for i = lo, hi do
+        result[#result + 1] = filenames[i][1]
+    end
+    return result
+end
+
 --[[doc
 
     count_font_files -- Return the number of files found by
@@ -3507,6 +3526,7 @@ names.getfilename                 = resolve_fullpath
 names.set_location_precedence     = set_location_precedence
 names.count_font_files            = count_font_files
 names.nth_font_filename           = nth_font_filename
+names.font_slice                  = font_slice
 
 --- font cache
 names.purge_cache    = purge_cache
diff --git a/src/luaotfload-tool.lua b/src/luaotfload-tool.lua
index 2301636..60d2c2c 100755
--- a/src/luaotfload-tool.lua
+++ b/src/luaotfload-tool.lua
@@ -906,6 +906,21 @@ end
 
 --[[doc--
 
+    list_remainder -- Show remaining fonts in bisect slice.
+
+--doc]]--
+
+local list_remainder = function (lo, hi)
+    local fonts = names.font_slice (lo, hi)
+    report ("info", 0, "bisect", "%d fonts left.", hi - lo)
+    for i = 1, #fonts do
+        report ("info", 1, "bisect", "   · %2d: %s", lo, fonts[i])
+        lo = lo + 1
+    end
+end
+
+--[[doc--
+
     bisect_set -- Prepare the next bisection step by setting high, low,
     and pivot to new values.
 
@@ -950,6 +965,9 @@ local bisect_set = function (outcome)
 
     status[nsteps + 1] = { lo, hi, pivot }
     write_bisect_status (status)
+    if hi - lo <= 10 then
+        list_remainder (lo, hi)
+    end
     return true, false
 end