Add trim_left() and trim_right() in addition to trim()

Also improve the trim() implementation.

1 files changed, 18 insertions, 0 deletions

diff --git a/libbutl/utility.hxx b/libbutl/utility.hxx
index 49b61b3..95a7f78 100644
--- a/libbutl/utility.hxx
+++ b/libbutl/utility.hxx
@@ -146,12 +146,30 @@ namespace butl
   LIBBUTL_SYMEXPORT std::string&
   trim (std::string&);
 
+  LIBBUTL_SYMEXPORT std::string&
+  trim_left (std::string&);
+
+  LIBBUTL_SYMEXPORT std::string&
+  trim_right (std::string&);
+
   inline std::string
   trim (std::string&& s)
   {
     return move (trim (s));
   }
 
+  inline std::string
+  trim_left (std::string&& s)
+  {
+    return move (trim_left (s));
+  }
+
+  inline std::string
+  trim_right (std::string&& s)
+  {
+    return move (trim_right (s));
+  }
+
   // Find the beginning and end poistions of the next word. Return the size
   // of the word or 0 and set b = e = n if there are no more words. For
   // example: