From ccf868537987ced29aea0d5c6fb6d45c94ee025a Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 8 Aug 2021 20:45:55 -0400
Subject: Factor out serd_choose_input_syntax()

---
 test/test_stdin.py |  2 ++
 tools/console.c    | 22 ++++++++++++++++++++++
 tools/console.h    |  5 +++++
 tools/serdi.c      | 24 +++++++++++-------------
 4 files changed, 40 insertions(+), 13 deletions(-)

diff --git a/test/test_stdin.py b/test/test_stdin.py
index 461f6d50..11b1ca21 100755
--- a/test/test_stdin.py
+++ b/test/test_stdin.py
@@ -18,6 +18,8 @@ command = shlex.split(args.wrapper) + [
     args.serdi,
     "-I",
     "http://example.org",
+    "-i",
+    "ntriples",
     "-",
 ]
 
diff --git a/tools/console.c b/tools/console.c
index 235d15d0..e13bf8a5 100644
--- a/tools/console.c
+++ b/tools/console.c
@@ -127,6 +127,28 @@ serd_set_output_option(const SerdStringView   name,
   return SERD_FAILURE;
 }
 
+SerdSyntax
+serd_choose_input_syntax(SerdWorld* const  world,
+                         const SerdSyntax  requested,
+                         const char* const filename)
+{
+  if (requested) {
+    return requested;
+  }
+
+  const SerdSyntax guessed = serd_guess_syntax(filename);
+  if (guessed != SERD_SYNTAX_EMPTY) {
+    return guessed;
+  }
+
+  serd_logf(world,
+            SERD_LOG_LEVEL_WARNING,
+            "unable to determine syntax of \"%s\", trying TriG",
+            filename);
+
+  return SERD_TRIG;
+}
+
 /// Wrapper for getc that is compatible with SerdReadFunc but faster than fread
 static size_t
 serd_file_read_byte(void* buf, size_t size, size_t nmemb, void* stream)
diff --git a/tools/console.h b/tools/console.h
index 5d174f1e..16f6fd14 100644
--- a/tools/console.h
+++ b/tools/console.h
@@ -34,6 +34,11 @@ serd_set_output_option(SerdStringView   name,
                        SerdSyntax*      syntax,
                        SerdWriterFlags* flags);
 
+SerdSyntax
+serd_choose_input_syntax(SerdWorld*  world,
+                         SerdSyntax  requested,
+                         const char* filename);
+
 SerdByteSource*
 serd_open_input(const char* filename, size_t block_size);
 
diff --git a/tools/serdi.c b/tools/serdi.c
index db4a016f..1e21fe19 100644
--- a/tools/serdi.c
+++ b/tools/serdi.c
@@ -134,7 +134,7 @@ parse_filter(SerdWorld* const      world,
 
 static SerdStatus
 read_file(SerdWorld* const      world,
-          SerdSyntax            syntax,
+          const SerdSyntax      syntax,
           const SerdReaderFlags flags,
           SerdEnv* const        env,
           const SerdSink* const sink,
@@ -143,9 +143,6 @@ read_file(SerdWorld* const      world,
           const char* const     add_prefix,
           const size_t          block_size)
 {
-  syntax = syntax ? syntax : serd_guess_syntax(filename);
-  syntax = syntax ? syntax : SERD_TRIG;
-
   SerdByteSource* byte_source = serd_open_input(filename, block_size);
 
   if (!byte_source) {
@@ -486,15 +483,16 @@ main(int argc, char** argv)
       snprintf(prefix, prefix_len, "f%d%s", i, add_prefix);
     }
 
-    if ((st = read_file(world,
-                        input_syntax,
-                        reader_flags,
-                        env,
-                        sink,
-                        stack_size,
-                        inputs[i],
-                        n_inputs > 1 ? prefix : add_prefix,
-                        block_size))) {
+    if ((st =
+           read_file(world,
+                     serd_choose_input_syntax(world, input_syntax, inputs[i]),
+                     reader_flags,
+                     env,
+                     sink,
+                     stack_size,
+                     inputs[i],
+                     n_inputs > 1 ? prefix : add_prefix,
+                     block_size))) {
       break;
     }
   }
-- 
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