1 files changed, 64 insertions, 8 deletions
diff --git a/ext/wasm/version-info.c b/ext/wasm/version-info.c
index cb5083a40..96c8e2dbe 100644
--- a/ext/wasm/version-info.c
+++ b/ext/wasm/version-info.c
@@ -12,15 +12,71 @@
 ** This file simply outputs sqlite3 version information in JSON form,
 ** intended for embedding in the sqlite3 JS API build.
 */
-#include <stdio.h>
 #include "sqlite3.h"
+#include <stdio.h>
+#include <string.h>
+
+static void usage(const char *zAppName){
+  puts("Emits version info about the sqlite3 it is built against.");
+  printf("Usage: %s [--quote] --INFO-FLAG:\n\n", zAppName);
+  puts("  --version          Emit SQLITE_VERSION (3.X.Y)");
+  puts("  --version-number   Emit SQLITE_VERSION_NUMBER (30XXYYZZ)");
+  puts("  --source-id        Emit SQLITE_SOURCE_ID");
+  puts("  --json             Emit all info in JSON form");
+  puts("\nThe non-JSON formats may be modified by:\n");
+  puts("  --quote            Add double quotes around output.");
+}
+
 int main(int argc, char const * const * argv){
-  if(argc || argv){/*unused*/}
-  printf("{\"libVersion\": \"%s\", "
-         "\"libVersionNumber\": %d, "
-         "\"sourceId\": \"%s\"}"/*missing newline is intentional*/,
-         SQLITE_VERSION,
-         SQLITE_VERSION_NUMBER,
-         SQLITE_SOURCE_ID);
+  int fJson = 0;
+  int fVersion = 0;
+  int fVersionNumber = 0;
+  int fSourceInfo = 0;
+  int fQuote = 0;
+  int nFlags = 0;
+  int i;
+
+  for( i = 1; i < argc; ++i ){
+    const char * zArg = argv[i];
+    while('-'==*zArg) ++zArg;
+    if( 0==strcmp("version", zArg) ){
+      fVersion = 1;
+    }else if( 0==strcmp("version-number", zArg) ){
+      fVersionNumber = 1;
+    }else if( 0==strcmp("source-id", zArg) ){
+      fSourceInfo = 1;
+    }else if( 0==strcmp("json", zArg) ){
+      fJson = 1;
+    }else if( 0==strcmp("quote", zArg) ){
+      fQuote = 1;
+      --nFlags;
+    }else{
+      printf("Unhandled flag: %s\n", argv[i]);
+      usage(argv[0]);
+      return 1;
+    }
+    ++nFlags;
+  }
+
+  if( 0==nFlags ) fJson = 1;
+  if( fJson ){
+    printf("{\"libVersion\": \"%s\", "
+           "\"libVersionNumber\": %d, "
+           "\"sourceId\": \"%s\"}"/*missing newline is intentional*/,
+           SQLITE_VERSION,
+           SQLITE_VERSION_NUMBER,
+           SQLITE_SOURCE_ID);
+  }else{
+    if(fQuote) printf("%c", '"');
+    if( fVersion ){
+      printf("%s", SQLITE_VERSION);
+    }else if( fVersionNumber ){
+      printf("%d", SQLITE_VERSION_NUMBER);
+    }else if( fSourceInfo ){
+      printf("%s", SQLITE_SOURCE_ID);
+    }
+    if(fQuote) printf("%c", '"');
+    puts("");
+  }
   return 0;
 }