From 57b45f9c73bd6fe53506f001accf5c9bf1165f0e Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Sat, 9 Apr 2016 09:44:46 -0400
Subject: [PATCH] helper: Added jsonFromIntervals

---
 src/helper.cpp | 33 +++++++++++++++++++++++++++++++++
 src/timew.h    |  1 +
 2 files changed, 34 insertions(+)

diff --git a/src/helper.cpp b/src/helper.cpp
index a0965637..79f42520 100644
--- a/src/helper.cpp
+++ b/src/helper.cpp
@@ -215,3 +215,36 @@ bool intervalMatchesFilter (const Interval& interval, const Filter& filter)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// Compose a JSON document of intervals. In the trivial case:
+//   [
+//   ]
+//
+// In the non-trivial case:
+//   [
+//   {...},
+//   {...}
+//   ]
+//
+std::string jsonFromIntervals (const std::vector <Interval>& intervals)
+{
+  std::stringstream out;
+
+  out << "[\n";
+  int counter = 0;
+  for (auto& interval : intervals)
+  {
+    if (counter)
+      out << ",\n";
+
+    out << interval.json ();
+    ++counter;
+  }
+
+  if (counter)
+    out << "\n";
+
+  out << "]\n";
+  return out.str ();
+}
+
+////////////////////////////////////////////////////////////////////////////////
diff --git a/src/timew.h b/src/timew.h
index 516dbfcf..99be7c1e 100644
--- a/src/timew.h
+++ b/src/timew.h
@@ -51,6 +51,7 @@ Filter createFilterFromCLI (const CLI&);
 Timeline createTimelineFromData (const Rules&, Database&, const Filter&);
 Interval getLatestInterval (Timeline&, Database&, const Filter&);
 bool intervalMatchesFilter (const Interval&, const Filter&);
+std::string jsonFromIntervals (const std::vector <Interval>&);
 
 // utiŀ.cpp
 std::string osName ();