(CHOOSE_NEWEST_EXE): New parameter macro.

Not defined by default.
(WinMain): Add conditional testing CHOOSE_NEWEST_EXE.
(WinMain): Convert backslashes to slashes in env var values.

1 files changed, 63 insertions, 13 deletions

diff --git a/nt/runemacs.c b/nt/runemacs.c
index 720c6ca7241..fe10021e98f 100644
--- a/nt/runemacs.c
+++ b/nt/runemacs.c
@@ -5,6 +5,21 @@
   use Emacs in windowing (GUI) mode, and will not want to have an extra
   console window lying around.  */
 
+/*
+   You may want to define this if you want to be able to install updated
+   emacs binaries even when other users are using the current version.
+   The problem with some file servers (notably Novell) is that an open
+   file cannot be overwritten, deleted, or even renamed.  So if someone
+   is running emacs.exe already, you cannot install a newer version.
+   By defining CHOOSE_NEWEST_EXE, you can name your new emacs.exe
+   something else which matches "emacs*.exe", and runemacs will
+   automatically select the newest emacs executeable in the bin directory.
+   (So you'll probably be able to delete the old version some hours/days
+   later).
+*/
+
+/* #define CHOOSE_NEWEST_EXE */
+
 #define WIN32
 
 #include <windows.h>
@@ -20,8 +35,8 @@ WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
   PROCESS_INFORMATION child;
   int wait_for_child = FALSE;
   DWORD ret_code = 0;
-  char * new_cmdline;
-  char * p;
+  char *new_cmdline;
+  char *p;
   char modname[MAX_PATH];
 
   if (!GetModuleFileName (NULL, modname, MAX_PATH))
@@ -32,23 +47,58 @@ WinMain (HINSTANCE hSelf, HINSTANCE hPrev, LPSTR cmdline, int nShow)
 
   new_cmdline = alloca (MAX_PATH + strlen (cmdline) + 1);
   strcpy (new_cmdline, modname);
-  strcat (new_cmdline, "\\emacs.exe ");
 
-  /* append original arguments if any; first look for -wait as first
-     argument, and apply that ourselves */
-  if (strncmp (cmdline, "-wait", 5) == 0)
+#ifdef CHOOSE_NEWEST_EXE
   {
-    wait_for_child = TRUE;
-    cmdline += 5;
+    /* Silly hack to allow new versions to be installed on
+       server even when current version is in use. */
+
+    char * best_name = alloca (MAX_PATH + 1);
+    FILETIME best_time = {0,0};
+    WIN32_FIND_DATA wfd;
+    HANDLE fh;
+    p = new_cmdline + strlen (new_cmdline);
+    strcpy (p, "\\emacs*.exe");
+    fh = FindFirstFile (new_cmdline, &wfd);
+    if (fh == INVALID_HANDLE_VALUE)
+      goto error;
+    do
+      {
+        if (wfd.ftLastWriteTime.dwHighDateTime > best_time.dwHighDateTime
+            || (wfd.ftLastWriteTime.dwHighDateTime == best_time.dwHighDateTime
+                && wfd.ftLastWriteTime.dwLowDateTime > best_time.dwLowDateTime))
+          {
+            best_time = wfd.ftLastWriteTime;
+            strcpy (best_name, wfd.cFileName);
+          }
+      }
+    while (FindNextFile (fh, &wfd));
+    FindClose (fh);
+    *p++ = '\\';
+    strcpy (p, best_name);
+    strcat (p, " ");
   }
+#else
+  strcat (new_cmdline, "\\emacs.exe");
+#endif
+
+  /* Append original arguments if any; first look for -wait as first
+     argument, and apply that ourselves.  */
+  if (strncmp (cmdline, "-wait", 5) == 0)
+    {
+      wait_for_child = TRUE;
+      cmdline += 5;
+    }
   strcat (new_cmdline, cmdline);
 
-  /* set emacs_dir variable if runemacs was in "%emacs_dir%\bin" */
+  /* Set emacs_dir variable if runemacs was in "%emacs_dir%\bin".  */
   if ((p = strrchr (modname, '\\')) && stricmp (p, "\\bin") == 0)
-  {
-    *p = 0;
-    SetEnvironmentVariable ("emacs_dir", modname);
-  }
+    {
+      *p = 0;
+      for (p = modname; *p; p++)
+        if (*p == '\\') *p = '/';
+      SetEnvironmentVariable ("emacs_dir", modname);
+    }
 
   memset (&start, 0, sizeof (start));
   start.cb = sizeof (start);