From 01955238036ac546ba1e488546101f65d213f4dd Mon Sep 17 00:00:00 2001
From: Pavel Belikov <pavel.fuchs.belikov@gmail.com>
Date: Tue, 14 Nov 2017 21:33:31 +0300
Subject: add leading whitespace support in Wrap

---
 args.hxx | 39 +++++++++++++++++++++++++--------------
 test.cxx | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 56 insertions(+), 15 deletions(-)

diff --git a/args.hxx b/args.hxx
index 655ef12..a381435 100644
--- a/args.hxx
+++ b/args.hxx
@@ -114,37 +114,48 @@ namespace args
 
         std::istringstream stream(in);
         std::vector<std::string> output;
-        std::ostringstream line;
-        std::string::size_type linesize = 0;
+        std::string line;
+        bool empty = true;
+
+        for (char c : in)
+        {
+            if (!isspace(c))
+            {
+                break;
+            }
+            line += c;
+        }
+
         while (stream)
         {
             std::string item;
             stream >> item;
             auto itemsize = Glyphs(item);
-            if ((linesize + 1 + itemsize) > currentwidth)
+            if ((line.length() + 1 + itemsize) > currentwidth)
             {
-                if (linesize > 0)
+                if (!empty)
                 {
-                    output.push_back(line.str());
-                    line.str(std::string());
-                    linesize = 0;
+                    output.push_back(line);
+                    line.clear();
+                    empty = true;
                     currentwidth = width;
                 }
             }
             if (itemsize > 0)
             {
-                if (linesize)
+                if (!empty)
                 {
-                    ++linesize;
-                    line << " ";
+                    line += ' ';
                 }
-                line << item;
-                linesize += itemsize;
+
+                line += item;
+                empty = false;
             }
         }
-        if (linesize > 0)
+
+        if (!empty)
         {
-            output.push_back(line.str());
+            output.push_back(line);
         }
         return output;
     }
diff --git a/test.cxx b/test.cxx
index 2c4cd6e..991d98e 100644
--- a/test.cxx
+++ b/test.cxx
@@ -968,7 +968,7 @@ TEST_CASE("HelpParams work as expected", "[args]")
 {
     args::ArgumentParser p("parser");
     args::ValueFlag<std::string> f(p, "name", "description", {'f', "foo"});
-    args::ValueFlag<std::string> g(p, "name", "description", {'g'});
+    args::ValueFlag<std::string> g(p, "name", "description\n  d1\n  d2", {'g'});
     p.Prog("prog");
 
     REQUIRE(p.Help() == R"(  prog {OPTIONS}
@@ -979,6 +979,8 @@ TEST_CASE("HelpParams work as expected", "[args]")
 
       -f[name], --foo=[name]            description
       -g[name]                          description
+                                          d1
+                                          d2
 
 )");
 
@@ -993,6 +995,8 @@ TEST_CASE("HelpParams work as expected", "[args]")
 
       -f, --foo [name]                  description
       -g[name]                          description
+                                          d1
+                                          d2
 
 )");
 
@@ -1004,6 +1008,8 @@ TEST_CASE("HelpParams work as expected", "[args]")
 
       -f, --foo                         description
       -g                                description
+                                          d1
+                                          d2
 
 )");
 
@@ -1018,6 +1024,8 @@ TEST_CASE("HelpParams work as expected", "[args]")
       -f, --foo
             description
       -g    description
+              d1
+              d2
 
 )");
 
@@ -1032,8 +1040,30 @@ TEST_CASE("HelpParams work as expected", "[args]")
             description
       -g
             description
+              d1
+              d2
 
 )");
+
+    args::ValueFlag<std::string> e(p, "name", "some reaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaally loooooooooooooooooooooooooooong description", {'e'});
+    REQUIRE(p.Help() == R"(  usage: prog {OPTIONS}
+
+    parser
+
+  Options
+
+      -f, --foo
+            description
+      -g
+            description
+              d1
+              d2
+      -e
+            some reaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaally
+            loooooooooooooooooooooooooooong description
+
+)");
+
 }
 
 #undef ARGS_HXX
-- 
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