From 2310a3f4747edf100b4c96737426239c893a04a9 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Mon, 13 Apr 2015 13:49:42 +0200
Subject: fixing -h and -v command line tool options

---
 src/util/util.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

(limited to 'src/util/util.c')

diff --git a/src/util/util.c b/src/util/util.c
index 7beff8348..2973a11c2 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -85,4 +85,113 @@ TALER_config_load (const char *base_dir)
   return cfg;
 }
 
+
+
+/**
+ * At what offset does the help text start?
+ */
+#define BORDER 29
+
+/**
+ * Print out details on command line options (implements --help).
+ *
+ * @param ctx command line processing context
+ * @param scls additional closure (points to about text)
+ * @param option name of the option
+ * @param value not used (NULL)
+ * @return #GNUNET_NO (do not continue, not an error)
+ */
+int
+TALER_GETOPT_format_help_ (struct GNUNET_GETOPT_CommandLineProcessorContext *ctx,
+			   void *scls,
+			   const char *option,
+			   const char *value)
+{
+  const char *about = scls;
+  size_t slen;
+  unsigned int i;
+  int j;
+  size_t ml;
+  size_t p;
+  char *scp;
+  const char *trans;
+  const struct GNUNET_GETOPT_CommandLineOption *opt;
+
+  if (NULL != about)
+  {
+    printf ("%s\n%s\n",
+	    ctx->binaryOptions,
+	    gettext (about));
+    printf (_("Arguments mandatory for long options are also mandatory for short options.\n"));
+  }
+  opt = ctx->allOptions;
+  for (i=0;NULL != opt[i].description;i++)
+  {
+    if (opt[i].shortName == '\0')
+      printf ("      ");
+    else
+      printf ("  -%c, ", opt[i].shortName);
+    printf ("--%s", opt[i].name);
+    slen = 8 + strlen (opt[i].name);
+    if (opt[i].argumentHelp != NULL)
+    {
+      printf ("=%s", opt[i].argumentHelp);
+      slen += 1 + strlen (opt[i].argumentHelp);
+    }
+    if (slen > BORDER)
+    {
+      printf ("\n%*s", BORDER, "");
+      slen = BORDER;
+    }
+    if (slen < BORDER)
+    {
+      printf ("%*s", (int) (BORDER - slen), "");
+      slen = BORDER;
+    }
+    if (0 < strlen (opt[i].description))
+      trans = gettext (opt[i].description);
+    else
+      trans = "";
+    ml = strlen (trans);
+    p = 0;
+OUTER:
+    while (ml - p > 78 - slen)
+    {
+      for (j = p + 78 - slen; j > p; j--)
+      {
+        if (isspace ((unsigned char) trans[j]))
+        {
+          scp = GNUNET_malloc (j - p + 1);
+          memcpy (scp, &trans[p], j - p);
+          scp[j - p] = '\0';
+          printf ("%s\n%*s", scp, BORDER + 2, "");
+          GNUNET_free (scp);
+          p = j + 1;
+          slen = BORDER + 2;
+          goto OUTER;
+        }
+      }
+      /* could not find space to break line */
+      scp = GNUNET_malloc (78 - slen + 1);
+      memcpy (scp, &trans[p], 78 - slen);
+      scp[78 - slen] = '\0';
+      printf ("%s\n%*s", scp, BORDER + 2, "");
+      GNUNET_free (scp);
+      slen = BORDER + 2;
+      p = p + 78 - slen;
+    }
+    /* print rest */
+    if (p < ml)
+      printf ("%s\n", &trans[p]);
+    if (strlen (trans) == 0)
+      printf ("\n");
+  }
+  printf ("Report bugs to taler@gnu.org.\n"
+          "Taler home page: http://www.gnu.org/software/taler/\n"
+          "General help using GNU software: http://www.gnu.org/gethelp/\n");
+  return GNUNET_NO;
+}
+
+
+
 /* end of util.c */
-- 
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