WIP: Get base URI from single input path if possible

1 files changed, 43 insertions, 2 deletions

diff --git a/src/serdi.c b/src/serdi.c
index de422092..1e9ceb88 100644
--- a/src/serdi.c
+++ b/src/serdi.c
@@ -14,13 +14,17 @@
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
+#define _XOPEN_SOURCE 600 /* for realpath */
+
 #include "system.h"
 
 #include "serd/serd.h"
 
 #ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN 1
 #include <fcntl.h>
 #include <io.h>
+#include <windows.h>
 #endif
 
 #include <limits.h>
@@ -39,6 +43,32 @@ typedef struct {
 	SerdNode* g;
 } FilterPattern;
 
+static char*
+serd_realpath(const char* const path)
+{
+	if (!path) {
+		return NULL;
+	}
+
+#ifdef _WIN32
+	const DWORD size = GetFullPathName(path, 0, NULL, NULL);
+	if (size == 0) {
+		return NULL;
+	}
+
+	char* const out = (char*)calloc(size, 1);
+	const DWORD ret = GetFullPathName(path, MAX_PATH, out, NULL);
+	if (ret == 0 || ret >= size) {
+		free(out);
+		return NULL;
+	}
+
+	return out;
+#else
+	return realpath(path, NULL);
+#endif
+}
+
 static int
 print_version(void)
 {
@@ -311,6 +341,9 @@ main(int argc, char** argv)
 	_setmode(_fileno(stdout), _O_BINARY);
 #endif
 
+	char** inputs   = argv + a;
+	int    n_inputs = argc - a;
+
 	bool input_has_graphs = serd_syntax_has_graphs(input_syntax);
 	for (int i = a; i < argc; ++i) {
 		if (serd_syntax_has_graphs(serd_guess_syntax(argv[i]))) {
@@ -323,6 +356,16 @@ main(int argc, char** argv)
 		output_syntax = input_has_graphs ? SERD_NQUADS : SERD_NTRIPLES;
 	}
 
+	if (!base && n_inputs == 1 &&
+	    (output_syntax == SERD_NQUADS || output_syntax == SERD_NTRIPLES)) {
+		// Choose base URI from the single input path
+		char* const abs_path = serd_realpath(inputs[0]);
+		if (abs_path) {
+			base = serd_new_file_uri(abs_path, NULL);
+			free(abs_path);
+		}
+	}
+
 	FILE*      out_fd = stdout;
 	SerdWorld* world  = serd_world_new();
 	SerdEnv*   env    = serd_env_new(base);
@@ -397,8 +440,6 @@ main(int argc, char** argv)
 		serd_reader_free(reader);
 	}
 
-	char** inputs     = argv + a;
-	int    n_inputs   = argc - a;
 	size_t prefix_len = 0;
 	char*  prefix     = NULL;
 	if (n_inputs > 1) {