Add strusage macro replacement feature.

* common/argparse.c (writechar): New.
(writestrings): Add macro replacement feature.
(show_help): Remove specialized @EMAIL@ replacement.
* configure.ac (GNUPG_NAME, GPG_NAME, GPGSM_NAME): Define.
(GPG_AGENT_NAME, DIRMNGR_NAME, G13_NAME, GPGCONF_NAME): Define.
(GPGTAR_NAME, GPG_AGENT_INFO_NAME, GPG_AGENT_SOCK_NAME): Define.
(GPG_AGENT_SSH_SOCK_NAME, DIRMNGR_INFO_NAME): Define.
(DIRMNGR_SOCK_NAME): Define.

Signed-off-by: Werner Koch <wk@gnupg.org>

common/argparse.c

@@ -185,6 +185,19 @@ argparse_register_outfnc (int (*fnc)(int, const char *))
 }
 
 
+static void
+writechar (int is_error, int c)
+{
+  char tmp[2];
+
+  tmp[0] = c;
+  tmp[1] = 0;
+  if (custom_outfnc)
+    custom_outfnc (is_error? 2:1, tmp);
+  else
+    fputs (tmp, is_error? stderr : stdout);
+}
+
 /* Write STRING and all following const char * arguments either to
    stdout or, if IS_ERROR is set, to stderr.  The list of strings must
    be terminated by a NULL.  */
@@ -200,6 +213,58 @@ writestrings (int is_error, const char *string, ...)
       s = string;
       va_start (arg_ptr, string);
       do
+        {
+          const char *s2, *s3;
+
+          /* Check whether to substitute a macro. */
+          if (s && (s2 = strchr (s, '@')) && s2[1] >= 'A' && s2[1] <= 'Z'
+              && (s3 = (strchr (s2+1, '@'))))
+            {
+              /* Might be.  */
+              static struct {
+                const char *name;
+                const char *value;
+              } macros[] = {
+#             ifdef PACKAGE_BUGREPORT
+                { "EMAIL", PACKAGE_BUGREPORT },
+#             else
+                { "EMAIL", "bug@example.org" },
+#             endif
+                { "GNUPG",     GNUPG_NAME },
+                { "GPG",       GPG_NAME },
+                { "GPGSM",     GPGSM_NAME },
+                { "GPG_AGENT", GPG_AGENT_NAME },
+                { "SCDAEMON",  SCDAEMON_NAME },
+                { "DIRMNGR",   DIRMNGR_NAME },
+                { "G13",       G13_NAME },
+                { "GPGCONF",   GPGCONF_NAME },
+                { "GPGTAR",    GPGTAR_NAME }
+              };
+              int idx;
+
+              s2++;
+              for (idx=0; idx < DIM (macros); idx++)
+                if (strlen (macros[idx].name) == (s3 - s2)
+                    && !memcmp (macros[idx].name, s2, (s3 - s2)))
+                  break;
+              s2--;
+              if (idx < DIM (macros)) /* Found.  Print and substitute.  */
+                {
+                  for (; s < s2; s++, count++)
+                    writechar (is_error, *s);
+                  count += writestrings (is_error, macros[idx].value, NULL);
+                  s3++;
+                }
+              else /* Not found.  Print macro as is. */
+                {
+                  for (; s < s3; s++, count++)
+                    writechar (is_error, *s);
+                }
+              /* Now recurse so that remaining macros are also
+                 substituted. */
+              count += writestrings (is_error, s3, NULL);
+            }
+          else
             {
               if (custom_outfnc)
                 custom_outfnc (is_error? 2:1, s);
@@ -207,6 +272,7 @@ writestrings (int is_error, const char *string, ...)
                 fputs (s, is_error? stderr : stdout);
               count += strlen (s);
             }
+        }
       while ((s = va_arg (arg_ptr, const char *)));
       va_end (arg_ptr);
     }
@@ -1222,34 +1288,7 @@ show_help (ARGPARSE_OPTS *opts, unsigned int flags)
     }
   if ( (s=strusage(19)) )
     {
-      /* bug reports to ... */
-      char *s2;
-
       writestrings (0, "\n", NULL);
-      s2 = strstr (s, "@EMAIL@");
-      if (s2)
-        {
-          if (s2-s)
-            {
-              const char *s3;
-
-              for (s3=s; s3 < s2; s3++)
-                {
-                  tmp[0] = *s3;
-                  tmp[1] = 0;
-                  writestrings (0, tmp, NULL);
-                }
-            }
-#ifdef PACKAGE_BUGREPORT
-          writestrings (0, PACKAGE_BUGREPORT, NULL);
-#else
-          writestrings (0, "bug@example.org", NULL);
-#endif
-          s2 += 7;
-          if (*s2)
-            writestrings (0, s2, NULL);
-        }
-      else
       writestrings (0, s, NULL);
     }
   flushstrings (0);

configure.ac

@@ -1574,6 +1574,32 @@ if test "$build_g13" = yes ; then
 fi
 
 
+#
+# Define Name strings
+#
+AC_DEFINE_UNQUOTED(GNUPG_NAME, "GnuPG", [The name of the project])
+AC_DEFINE_UNQUOTED(GPG_NAME, "gpg", [The name of the OpenPGP tool])
+AC_DEFINE_UNQUOTED(GPGSM_NAME, "gpgsm", [The name of the S/MIME tool])
+AC_DEFINE_UNQUOTED(GPG_AGENT_NAME, "gpg-agent", [The name of the agent])
+AC_DEFINE_UNQUOTED(SCDAEMON_NAME, "scdaemon", [The name of the scdaemon])
+AC_DEFINE_UNQUOTED(DIRMNGR_NAME, "dirmngr", [The name of the dirmngr])
+AC_DEFINE_UNQUOTED(G13_NAME, "g13", [The name of the g13 tool])
+AC_DEFINE_UNQUOTED(GPGCONF_NAME, "gpgconf", [The name of the gpgconf tool])
+AC_DEFINE_UNQUOTED(GPGTAR_NAME, "gpgtar", [The name of the gpgtar tool])
+
+AC_DEFINE_UNQUOTED(GPG_AGENT_INFO_NAME, "GPG_AGENT_INFO",
+                   [The name of the agent info envvar])
+AC_DEFINE_UNQUOTED(GPG_AGENT_SOCK_NAME, "S.gpg-agent",
+                   [The name of the agent socket])
+AC_DEFINE_UNQUOTED(GPG_AGENT_SSH_SOCK_NAME, "S.gpg-agent.ssh",
+                   [The name of the agent socket for ssh])
+AC_DEFINE_UNQUOTED(DIRMNGR_INFO_NAME, "DIRMNGR_INFO",
+                   [The name of the dirmngr info envvar])
+AC_DEFINE_UNQUOTED(DIRMNGR_SOCK_NAME, "S.dirmngr",
+                   [The name of the dirmngr socket])
+
+AC_DEFINE_UNQUOTED(GPGEXT_GPG, "gpg", [The standard binary file suffix])
+
 
 #
 # Provide information about the build.