Incorporate some git information into NetHack

Incorporate some git information into NetHack so that it
is potentially visible to a player. That's useful when
collecting details about the version that they are
running and, if the gitinfo is present, it can tie the
code to a specific git commit in the repository.

This modifies 'makedefs -v' to check for the presence of a data file
called dat/gitinfo.txt and if it is there, parse out its
contents, then write additional lines to include/date.h beyond
what 'makedefs -v' was previously putting in there, similar to
this sample:

      #define NETHACK_GIT_SHA "0c84e564c78e2024e562d39539376ce2e21eec8e"
      #define NETHACK_GIT_BRANCH "NetHack-3.6.0"

The contents of an appropriate dat/gitinfo.txt are as follows,
and trailing/leading whitespace is not significant:

      githash = 0c84e564c78e2024e562d39539376ce2e21eec8e
      gitbranch = NetHack-3.6.0

It also adjusts the contents of the 'v' version information to
include the additional git info when available.

Also adds some hooks DEVEL/hooksdir and a perl file to DEVEL
for simplifying and automating the deposit of dat/gitinfo.txt
so that it generally reflects the most current git commit.

DEVEL/gitinfo.pl can be used to build dat/gitinfo.txt at any
time without doing a commit, merge, or checkout.
    	perl DEVEL/gitinfo.pl

command line --version and -version support

To complement the extra information being provided in the
version by the 'v' command, this also adds support for the
following new command line arguments:
    --version
     -version            Output the NetHack version string then exit.

    --version:paste      Output the NetHack version string and also copy it to
     -version:paste      the platform's paste buffer for insertion somewhere,
                         then exit.

If the paste variation of -version is requested on a platform that
hasn't incorporated any support for the capability, it will deliver
the version info then an error message, prior to exiting.

To support the extended -version:paste variation, a port needs to:
    - provide a port-specific routine to perform
      the paste buffer copy in a port code file.
    - #define RUNTIME_PASTEBUF_SUPPORT in the include/portconf.h header file.

    --skeleton--
    void port_insert_pastebuf(buf)
    char *buf;
    {
    	/* insert code to copy the version info from buf into
    	   platform's paste buffer in a supported way */
    }

macosx and Windows have both added support for RUNTIME_PASTEBUF_SUPPORT

include/decl.h

@@ -422,6 +422,15 @@ E struct plinemsg_type *plinemsg_types;
 E const char *ARGV0;
 #endif
 
+enum earlyarg {ARG_DEBUG, ARG_VERSION};
+
+struct early_opt {
+    enum earlyarg e;
+    const char *name;
+    int minlength;
+    boolean valallowed;
+};
+
 #undef E
 
 #endif /* DECL_H */

include/extern.h

@@ -26,6 +26,7 @@ E void NDECL(display_gamewindows);
 E void NDECL(newgame);
 E void FDECL(welcome, (BOOLEAN_P));
 E time_t NDECL(get_realtime);
+E boolean FDECL(argcheck, (int, char **, enum earlyarg));
 
 /* ### apply.c ### */
 
@@ -2567,10 +2568,14 @@ E void FDECL(store_version, (int));
 E unsigned long FDECL(get_feature_notice_ver, (char *));
 E unsigned long NDECL(get_current_feature_ver);
 E const char *FDECL(copyright_banner_line, (int));
+E void FDECL(early_version_info, (BOOLEAN_P));
 
 #ifdef RUNTIME_PORT_ID
 E char *FDECL(get_port_id, (char *));
 #endif
+#ifdef RUNTIME_PASTEBUF_SUPPORT
+E void FDECL(port_insert_pastebuf, (char *));
+#endif
 
 /* ### video.c ### */
 

include/ntconf.h

@@ -69,6 +69,12 @@
 #define PORT_DEBUG /* include ability to debug international keyboard issues \
                       */
 
+#define RUNTIME_PORT_ID /* trigger run-time port identification for \
+                         * identification of exe CPU architecture   \
+                         */
+#define RUNTIME_PASTEBUF_SUPPORT
+
+
 #define SAFERHANGUP /* Define SAFERHANGUP to delay hangup processing   \
                      * until the main command loop. 'safer' because it \
                      * avoids certain cheats and also avoids losing    \
@@ -117,11 +123,6 @@ extern void FDECL(interject, (int));
 #endif
 #endif /* _MSC_VER */
 
-
-#define RUNTIME_PORT_ID /* trigger run-time port identification for \
-                         * identification of exe CPU architecture   \
-                         */
-
 /* The following is needed for prototypes of certain functions */
 #if defined(_MSC_VER)
 #include <process.h> /* Provides prototypes of exit(), spawn()      */

include/unixconf.h

@@ -387,5 +387,9 @@
 #endif /* LINUX */
 #endif /* GNOME_GRAPHICS */
 
+#ifdef __APPLE__
+# define RUNTIME_PASTEBUF_SUPPORT
+#endif
+
 #endif /* UNIXCONF_H */
 #endif /* UNIX */