From 22777067c4c4f378941b45461f707c8cb3277845 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Sun, 17 Apr 2016 10:32:16 -0400
Subject: [PATCH] CmdTags: Displays 'No data found' instead of an empty table,
 if there are no inclusions

---
 src/commands/CmdTags.cpp | 52 +++++++++++++++++++++++-----------------
 1 file changed, 30 insertions(+), 22 deletions(-)

diff --git a/src/commands/CmdTags.cpp b/src/commands/CmdTags.cpp
index 669c1731..46459855 100644
--- a/src/commands/CmdTags.cpp
+++ b/src/commands/CmdTags.cpp
@@ -29,44 +29,52 @@
 #include <timew.h>
 #include <Table.h>
 #include <Color.h>
-#include <algorithm>
+#include <set>
 #include <iostream>
 
 ////////////////////////////////////////////////////////////////////////////////
 int CmdTags (Rules& rules, Database& database)
 {
   // Generate a unique, ordered list of tags.
-  std::vector <std::string> tags;
+  std::set <std::string> tags;
   for (auto& line : database.allLines ())
   {
-    Interval interval;
-    interval.initialize (line);
+    if (line[0] == 'i')
+    {
+      Interval interval;
+      interval.initialize (line);
 
-    for (auto& tag : interval.tags ())
-      if (std::find (tags.begin (), tags.end (), tag) == tags.end ())
-        tags.push_back (tag);
+      for (auto& tag : interval.tags ())
+        tags.insert (tag);
+    }
   }
 
   // Shows all tags.
-  Table t;
-  t.width (1024);
-  t.colorHeader (Color ("underline"));
-  t.add ("Tag");
-  t.add ("Description");
-  // TODO Show all tag metadata.
-
-  for (auto& tag : tags)
+  if (tags.size ())
   {
-    auto row = t.addRow ();
-    t.set (row, 0, tag, tagColor (rules, tag));
+    Table t;
+    t.width (1024);
+    t.colorHeader (Color ("underline"));
+    t.add ("Tag");
+    t.add ("Description");
+    // TODO Show all tag metadata.
 
-    auto name = std::string ("tag.") + tag + ".description";
-    t.set (row, 1, rules.has (name) ? rules.get (name) : "-");
+    for (auto& tag : tags)
+    {
+      auto row = t.addRow ();
+      t.set (row, 0, tag, tagColor (rules, tag));
+
+      auto name = std::string ("tag.") + tag + ".description";
+      t.set (row, 1, rules.has (name) ? rules.get (name) : "-");
+    }
+
+    std::cout << "\n"
+              << t.render ()
+              << "\n";
   }
+  else
+    std::cout << "No data found.\n";
 
-  std::cout << "\n"
-            << t.render ()
-            << "\n";
   return 0;
 }