From 3b3817823c155eb2c9f7bc73b313052f0f441416 Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko <sev@scummvm.org>
Date: Wed, 18 May 2022 22:43:01 +0200
Subject: [PATCH] DEVTOOLS: Make create_engine run from scummvm root as well

---
 devtools/create_engine/create_engine.cpp | 50 +++++++++++++++++-------
 1 file changed, 36 insertions(+), 14 deletions(-)

diff --git a/devtools/create_engine/create_engine.cpp b/devtools/create_engine/create_engine.cpp
index 0507cee0201..13f29c60ab9 100644
--- a/devtools/create_engine/create_engine.cpp
+++ b/devtools/create_engine/create_engine.cpp
@@ -25,6 +25,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <sys/stat.h>
+#include <unistd.h>
 
 // Specified engine name with different cases
 #define MAX_LINE_LENGTH 256
@@ -85,15 +86,15 @@ void process_file(FILE *in, FILE *out) {
 }
 
 // Copies and processes the specified file
-void process_file(const char *filename) {
+void process_file(const char *filename, const char *prefix, const char *prefix2) {
 	char srcFilename[128], destFilename[128];
-	sprintf(srcFilename, "files/%s", filename);
+	sprintf(srcFilename, "%s/files/%s", prefix2, filename);
 	if (!strncmp(filename, "xyzzy.", 6))
-		sprintf(destFilename, "../../engines/%s/%s.%s",
-			engineLowercase, engineLowercase, filename + 6);
+		sprintf(destFilename, "%s/engines/%s/%s.%s",
+			prefix, engineLowercase, engineLowercase, filename + 6);
 	else
-		sprintf(destFilename, "../../engines/%s/%s",
-			engineLowercase, filename);
+		sprintf(destFilename, "%s/engines/%s/%s",
+			prefix, engineLowercase, filename);
 
 	printf("Creating file %s...", destFilename);
 	fflush(stdout);
@@ -120,17 +121,22 @@ void process_file(const char *filename) {
 // For Visual Studio convenience, creates a copy of the
 // create_msvc.bat to <engine>.bat that allows creating
 // the ScummVM solution with just that engine enabled
-void create_batch_file() {
+void create_batch_file(const char *prefix) {
 	FILE *in, *out;
 	char line[MAX_LINE_LENGTH];
+	char destFilename[MAX_LINE_LENGTH];
 
-	if (!(in = fopen("../../dists/msvc/create_msvc.bat", "r"))) {
+	sprintf(destFilename, "%s/dists/msvc/create_msvc.bat", prefix);
+	if (!(in = fopen(destFilename, "r"))) {
 		printf("Could not open create_msvc.bat\n");
 		exit(0);
 	}
 
-	char destFilename[MAX_LINE_LENGTH];
-	sprintf(destFilename, "../../dists/msvc/%s.bat", engineLowercase);
+	sprintf(destFilename, "%s/dists/msvc/%s.bat", prefix, engineLowercase);
+
+	printf("Creating file %s...", destFilename);
+	fflush(stdout);
+
 	if (!(out = fopen(destFilename, "w"))) {
 		printf("Could not create %s.bat\n", engineLowercase);
 		exit(0);
@@ -148,6 +154,8 @@ void create_batch_file() {
 		fputs(line, out);
 	}
 
+	printf("done\n");
+
 	fclose(in);
 	fclose(out);
 }
@@ -166,11 +174,25 @@ int main(int argc, char *argv[]) {
 			engineUppercase[i] : engineLowercase[i];
 	}
 
+	char prefix[100];
+	char prefix2[100];
+	if (!access("../../engines", F_OK)) {
+		strcpy(prefix, "../..");
+		strcpy(prefix2, ".");
+	} else if (!access("engines", F_OK)) {
+		strcpy(prefix, ".");
+		strcpy(prefix2, "devtools/create_engine");
+	} else {
+		printf("Cound not locate engines directory. Run from the scummvm source root directory\n");
+		return 0;
+	}
+
+
 	// Create a directory for the new engine
 	char folder[MAX_LINE_LENGTH];
-	sprintf(folder, "../../engines/%s", engineLowercase);
+	sprintf(folder, "%s/engines/%s", prefix, engineLowercase);
 
-	printf("Creating directory ../../engines/%s...", engineLowercase);
+	printf("Creating directory %s...", folder);
 	fflush(stdout);
 
 	if (mkdir(folder, 0755)) {
@@ -181,9 +203,9 @@ int main(int argc, char *argv[]) {
 
 	// Process the files
 	for (const char *const *filename = FILENAMES; *filename; ++filename)
-		process_file(*filename);
+		process_file(*filename, prefix, prefix2);
 
-	create_batch_file();
+	create_batch_file(prefix);
 
 	printf("Engine generation complete.\n");
 	return 0;