doc: Get rid of version.texi

* configure.ac (CC_FOR_BUILD): New.
* doc/mkdefsinc.c: New.  Taken from GnuPG and modified for gpgme.
* doc/Makefile.am (EXTRA_DIST): Add defsincdate and mkdefsinc.c
(BUILT_SOURCES): new.
(gpgme.texi): New dependency.
(mkdefsinc, defsincdate, defs.inc): New rules.
(dist-hook): New.
* doc/gpgme.texi: Include defs.inc.  Remove version.texi.
--

GnuPG-bug-id: 2352

That new system should also yield more approriate date infos for the
manual.

configure.ac

@@ -127,6 +127,22 @@ VERSION_NUMBER=m4_esyscmd(printf "0x%02x%02x%02x" mym4_version_major \
                           mym4_version_minor mym4_version_micro)
 AC_SUBST(VERSION_NUMBER)
 
+# We need to compile and run a program on the build machine.  A
+# comment in libgpg-error says that the AC_PROG_CC_FOR_BUILD macro in
+# the AC archive is broken for autoconf 2.57.  Given that there is no
+# newer version of that macro, we assume that it is also broken for
+# autoconf 2.61 and thus we use a simple but usually sufficient
+# approach.
+AC_MSG_CHECKING(for cc for build)
+if test "$cross_compiling" = "yes"; then
+  CC_FOR_BUILD="${CC_FOR_BUILD-cc}"
+else
+  CC_FOR_BUILD="${CC_FOR_BUILD-$CC}"
+fi
+AC_MSG_RESULT($CC_FOR_BUILD)
+AC_ARG_VAR(CC_FOR_BUILD,[build system C compiler])
+
+
 # Don't default to build static libs.
 LT_PREREQ([2.2.6])
 LT_INIT([win32-dll disable-static])

doc/Makefile.am

@@ -20,12 +20,38 @@
 ## Process this file with automake to produce Makefile.in
 
 DISTCLEANFILES = gpgme.tmp
+CLEANFILES = mkdefsinc defs.inc
+
+EXTRA_DIST = module-overview.sk HACKING DCO ChangeLog-2011 \
+             mkdefsinc.c defsincdate
+
+BUILT_SOURCES = defsincdate defs.inc
 
-EXTRA_DIST = module-overview.sk HACKING DCO ChangeLog-2011
 
 info_TEXINFOS = gpgme.texi
 gpgme_TEXINFOS = uiserver.texi lesser.texi gpl.texi
 
+gpgme.texi : defs.inc
+
+mkdefsinc: mkdefsinc.c Makefile ../config.h
+	$(CC_FOR_BUILD) -I. -I.. -I$(srcdir) $(AM_CPPFLAGS) \
+	   -o $@ $(srcdir)/mkdefsinc.c
+
+dist-hook: defsincdate
+
+defsincdate: $(gpgme_TEXINFOS)
+	: >defsincdate ; \
+	if test -e $(top_srcdir)/.git; then \
+	  (cd $(srcdir) && git log -1 --format='%ct' -- \
+             $(info_TEXINFOS) $(gpgme_TEXINFOS) 2>/dev/null) >>defsincdate; \
+	fi
+
+defs.inc: defsincdate Makefile mkdefsinc
+	incd="`test -f defsincdate || echo '$(srcdir)/'`defsincdate"; \
+	./mkdefsinc -C $(srcdir) --date "`cat $$incd 2>/dev/null`" \
+	    $(info_TEXINFOS) $(gpgme_TEXINFOS) >$@
+
+
 online: gpgme.html gpgme.pdf
 	set -e; \
 	echo "Uploading current manuals to www.gnupg.org ..."; \

doc/gpgme.texi

@@ -1,6 +1,7 @@
 \input texinfo                   @c -*- mode: texinfo; coding: utf-8; -*-
 @documentencoding UTF-8
 @setfilename gpgme.info
+@include defs.inc
 @settitle The `GnuPG Made Easy' Reference Manual
 
 @dircategory GNU Libraries
@@ -30,8 +31,6 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.
 @end copying
 
-@include version.texi
-
 @c Macros used by the description of the UI server protocol
 @macro clnt
   @sc{c:} @c

doc/mkdefsinc.c

@@ -0,0 +1,310 @@
+/* mkdefsinc.c - Tool to create defs.inc
+ * Copyright (C) 2015 g10 Code GmbH
+ *
+ * This file is free software; as a special exception the author gives
+ * unlimited permission to copy and/or distribute it, with or without
+ * modifications, as long as this notice is preserved.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/* This tool needs to be build with command line supplied -D options
+   for the various directory variables.  It is easier to do this in
+   build file than to use fragile make rules and a template file.  */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define PGM "mkdefsinc"
+
+/* We include config.h after all include files because the config.h
+   values are not valid for the build platform but we need some values
+   nevertheless.  */
+#include "config.h"
+
+
+static int verbose;
+
+
+/* The usual free wrapper.  */
+static void
+xfree (void *a)
+{
+  if (a)
+    free (a);
+}
+
+
+static char *
+xmalloc (size_t n)
+{
+  char *p;
+
+  p = malloc (n);
+  if (!p)
+    {
+      fputs (PGM ": out of core\n", stderr);
+      exit (1);
+    }
+  return p;
+}
+
+
+static char *
+xstrdup (const char *string)
+{
+  char *p;
+
+  p = xmalloc (strlen (string)+1);
+  strcpy (p, string);
+  return p;
+}
+
+
+/* Return a malloced string with the last modification date of the
+   FILES.  Returns NULL on error.  */
+static char *
+get_date_from_files (char **files)
+{
+  const char *file;
+  const char *usedfile = NULL;
+  struct stat sb;
+  struct tm *tp;
+  int errors = 0;
+  time_t stamp = 0;
+  char *result;
+
+  for (; (file = *files); files++)
+    {
+      if (!*file || !strcmp (file, ".") || !strcmp (file, ".."))
+        continue;
+      if (stat (file, &sb))
+        {
+          fprintf (stderr, PGM ": stat failed for '%s': %s\n",
+                   file, strerror (errno));
+          errors = 1;
+          continue;
+        }
+      if (sb.st_mtime > stamp)
+        {
+          stamp = sb.st_mtime;
+          usedfile = file;
+        }
+    }
+  if (errors)
+    exit (1);
+
+  if (usedfile)
+    fprintf (stderr, PGM ": taking date from '%s'\n", usedfile);
+
+  tp = gmtime (&stamp);
+  if (!tp)
+    return NULL;
+  result = xmalloc (4+1+2+1+2+1);
+  snprintf (result, 4+1+2+1+2+1, "%04d-%02d-%02d",
+            tp->tm_year + 1900, tp->tm_mon+1, tp->tm_mday);
+  return result;
+}
+
+
+/* We need to escape file names for Texinfo.  */
+static void
+print_filename (const char *prefix, const char *name)
+{
+  const char *s;
+
+  fputs (prefix, stdout);
+  for (s=name; *s; s++)
+    switch (*s)
+      {
+      case '@': fputs ("@atchar{}",        stdout); break;
+      case '{': fputs ("@lbracechar{}",    stdout); break;
+      case '}': fputs ("@rbracechar{}",    stdout); break;
+      case ',': fputs ("@comma{}",         stdout); break;
+      case '\\':fputs ("@backslashchar{}", stdout); break;
+      case '#': fputs ("@hashchar{}",      stdout); break;
+      default: putchar (*s); break;
+      }
+  putchar('\n');
+}
+
+
+int
+main (int argc, char **argv)
+{
+  int last_argc = -1;
+  char *opt_date = NULL;
+  int monthoff;
+  char *p, *pend;
+  size_t n;
+
+  /* Option parsing.  */
+  if (argc)
+    {
+      argc--; argv++;
+    }
+  while (argc && last_argc != argc )
+    {
+      last_argc = argc;
+      if (!strcmp (*argv, "--"))
+        {
+          argc--; argv++;
+          break;
+        }
+      else if (!strcmp (*argv, "--help"))
+        {
+          fputs ("Usage: " PGM " [OPTION] [FILES]\n"
+                 "Create defs.inc file.\nOptions:\n"
+                 "  -C DIR         Change to DIR before doing anything\n"
+                 "  --date STRING  Take publication date from STRING\n"
+                 "  --verbose      Enable extra informational output\n"
+                 "  --help         Display this help and exit\n"
+                 , stdout);
+          exit (0);
+        }
+      else if (!strcmp (*argv, "--verbose"))
+        {
+          verbose = 1;
+          argc--; argv++;
+        }
+      else if (!strcmp (*argv, "-C"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              if (chdir (*argv))
+                {
+                  fprintf (stderr, PGM ": chdir to '%s' failed: %s\n",
+                           *argv, strerror (errno));
+                  exit (1);
+                }
+              argc--; argv++;
+            }
+        }
+      else if (!strcmp (*argv, "--date"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              opt_date = xstrdup (*argv);
+              argc--; argv++;
+            }
+        }
+      else if (!strncmp (*argv, "--", 2))
+        {
+          fprintf (stderr, PGM ": unknown option '%s'\n", *argv);
+          exit (1);
+        }
+    }
+
+  if (opt_date && *opt_date)
+    {
+      time_t stamp;
+      struct tm *tp;
+
+      if (*opt_date == '2' && strlen (opt_date) >= 10
+          && opt_date[4] == '-' && opt_date[7] == '-')
+        {
+          opt_date[10] = 0;
+        }
+      else if ((stamp = strtoul (opt_date, NULL, 10)) > 0
+               && (tp = gmtime (&stamp)))
+        {
+          p = xmalloc (4+1+2+1+2+1);
+          snprintf (p, 4+1+2+1+2+1, "%04d-%02d-%02d",
+                    tp->tm_year + 1900, tp->tm_mon+1, tp->tm_mday);
+          xfree (opt_date);
+          opt_date = p;
+        }
+      else
+        {
+          fprintf (stderr, PGM ": bad date '%s'\n", opt_date);
+          exit (1);
+        }
+    }
+  else
+    {
+      xfree (opt_date);
+      opt_date = argc? get_date_from_files (argv) : NULL;
+    }
+  if (!opt_date)
+    {
+      opt_date = xstrdup ("unknown");
+      monthoff = 0;
+    }
+  else
+    {
+      const char *month = "?";
+
+      switch (atoi (opt_date+5))
+        {
+        case  1: month = "January"; break;
+        case  2: month = "February"; break;
+        case  3: month = "March"; break;
+        case  4: month = "April"; break;
+        case  5: month = "May"; break;
+        case  6: month = "June"; break;
+        case  7: month = "July"; break;
+        case  8: month = "August"; break;
+        case  9: month = "September"; break;
+        case 10: month = "October"; break;
+        case 11: month = "November"; break;
+        case 12: month = "December"; break;
+        }
+      n = strlen (opt_date) + strlen (month) + 2 + 1;
+      p = xmalloc (n);
+      snprintf (p, n, "%d %n%s %d",
+                atoi (opt_date+8), &monthoff, month, atoi (opt_date));
+      xfree (opt_date);
+      opt_date = p;
+    }
+
+
+  fputs ("@c defs.inc                         -*- texinfo -*-\n"
+         "@c Common and build specific constants for the manuals.\n"
+         "@c This file has been created by " PGM ".\n\n", stdout);
+
+  fputs ("@ifclear defsincincluded\n"
+         "@set defsincincluded 1\n\n", stdout);
+
+
+  fputs ("\n@c Flags\n\n", stdout);
+
+  fputs ("\n@c Directories\n\n", stdout);
+
+  /* print_filename ("@set BINDIR         ", GNUPG_BINDIR ); */
+
+  fputs ("\n@c Version information a la version.texi\n\n", stdout);
+
+  printf ("@set UPDATED %s\n", opt_date);
+  printf ("@set UPDATED-MONTH %s\n", opt_date + monthoff);
+  printf ("@set EDITION %s\n", PACKAGE_VERSION);
+  printf ("@set VERSION %s\n", PACKAGE_VERSION);
+
+  fputs ("\n@c Macros\n\n", stdout);
+
+  /* Trailer.  */
+  fputs ("\n"
+         "@end ifclear\n"
+         "\n"
+         "@c Loc" "al Variables:\n"
+         "@c buffer-read-only: t\n"
+         "@c End:\n", stdout);
+
+  if (ferror (stdout))
+    {
+      fprintf (stderr, PGM ": error writing to stdout: %s\n", strerror (errno));
+      return 1;
+    }
+
+  return 0;
+}