str: Add ltrim and rtrim

Useful when you only want to trim one side..

2 files changed, 21 insertions, 0 deletions

diff --git a/src/str.cc b/src/str.cc
index e5b70ed..129e0f3 100644
--- a/src/str.cc
+++ b/src/str.cc
@@ -76,4 +76,19 @@ std::string_view trim(std::string_view str) {
   return str.substr(s, e - s);
 }
 
+std::string_view ltrim(std::string_view str) {
+  size_t s = 0;
+  size_t const e = str.size();
+  while (s < e && is_space(str[s]))
+    ++s;
+  return str.substr(s, e - s);
+}
+
+std::string_view rtrim(std::string_view str) {
+  size_t e = str.size();
+  while (e > 0 && is_space(str[e - 1]))
+    --e;
+  return str.substr(0, e);
+}
+
 }  // namespace str
diff --git a/src/str.hh b/src/str.hh
index 1c618ee..c736f4b 100644
--- a/src/str.hh
+++ b/src/str.hh
@@ -23,6 +23,12 @@ void split(std::string_view str, std::vector<std::string_view>& out,
 [[nodiscard]]
 std::string_view trim(std::string_view str);
 
+[[nodiscard]]
+std::string_view ltrim(std::string_view str);
+
+[[nodiscard]]
+std::string_view rtrim(std::string_view str);
+
 }  // namespace str
 
 #endif  // STR_HH