[db] use tput to determine the terminal size if appropriate

1 files changed, 36 insertions, 4 deletions

diff --git a/luaotfload-database.lua b/luaotfload-database.lua
index bccfd7b..714c37c 100644
--- a/luaotfload-database.lua
+++ b/luaotfload-database.lua
@@ -47,7 +47,6 @@ local C, Cc, Cf, Cg, Cs, Ct
 --- Luatex builtins
 local load                     = load
 local next                     = next
-local pcall                    = pcall
 local require                  = require
 local tonumber                 = tonumber
 local unpack                   = table.unpack
@@ -59,6 +58,7 @@ local fontloaderopen           = fontloader.open
 local gzipopen                 = gzip.open
 local iolines                  = io.lines
 local ioopen                   = io.open
+local iopopen                  = io.popen
 local kpseexpand_path          = kpse.expand_path
 local kpseexpand_var           = kpse.expand_var
 local kpsefind_file            = kpse.find_file
@@ -123,6 +123,26 @@ local luaotfloadconfig         = config.luaotfload --- always present
 luaotfloadconfig.resolver      = luaotfloadconfig.resolver or "normal"
 luaotfloadconfig.formats       = luaotfloadconfig.formats  or "otf,ttf,ttc,dfont"
 luaotfloadconfig.strip         = luaotfloadconfig.strip == true
+--- The “termwidth” value is only considered when printing
+--- short status messages, e.g. when building the database
+--- online.
+if not luaotfloadconfig.termwidth then
+    local tw = 79
+    if not (    os.type == "windows" --- Assume broken terminal.
+            or os.getenv "TERM" == "dumb")
+        and iopopen
+    then
+        local p = iopopen "tput cols"
+        if p then
+            result = p:read "*all"
+            p:close ()
+            if result then
+                tw = tonumber (result) or tw
+            end
+        end
+    end
+    luaotfloadconfig.termwidth = tw
+end
 
 --- this option allows for disabling updates
 --- during a TeX run
@@ -1349,7 +1369,7 @@ local get_english_names = function (names, basename)
     local english_names
 
     if names then
-        inspect(names)
+        --inspect(names)
         for _, raw_namedata in next, names do
             if raw_namedata.lang == "English (US)" then
                 english_names = raw_namedata.names
@@ -2086,6 +2106,16 @@ local find_font_files = function (root, recurse)
     end
 end
 
+--- truncate_string -- Cut the first part of a string to fit it
+--- into a given terminal width. The parameter “restrict” (int)
+--- indicates the number of characters already consumed on the
+--- line.
+local ellipsis = ".."
+local truncate_string = function (str, restrict)
+    local wd  = luaotfloadconfig.termwidth - restrict - 2
+    return ellipsis .. stringsub(str, #str - wd)
+end
+
 --[[doc--
 
     scan_dir() scans a directory and populates the list of fonts
@@ -2131,10 +2161,12 @@ local scan_dir = function (dirname, currentnames, targetnames,
         local new
 
         if dry_run == true then
+            local truncated = truncate_string (fullname, 43)
             report_status ("both", "db",
-                        "Would have been loading %q", fullname)
+                        "Would have been loading %s", truncated)
         else
-            report_status ("both", "db", "Loading font %q", fullname)
+            local truncated = truncate_string (fullname, 32)
+            report_status ("both", "db", "Loading font %s", truncated)
             local new = read_font_names (fullname, currentnames,
                                         targetnames, texmf)
             if new == true then