util: allow newlines in string to be split

src/common/util.cpp

@@ -1239,7 +1239,7 @@ std::string get_nix_version_display_string()
     return get_string_prefix_by_width(s, 999999999).second;
   };
 
-  std::vector<std::pair<std::string, size_t>> split_string_by_width(const std::string &s, size_t columns)
+  std::vector<std::pair<std::string, size_t>> split_line_by_width(const std::string &s, size_t columns)
   {
     std::vector<std::string> words;
     std::vector<std::pair<std::string, size_t>> lines;
@@ -1279,4 +1279,17 @@ std::string get_nix_version_display_string()
     return lines;
   }
 
+  std::vector<std::pair<std::string, size_t>> split_string_by_width(const std::string &s, size_t columns)
+  {
+    std::vector<std::string> lines;
+    std::vector<std::pair<std::string, size_t>> all_lines;
+    boost::split(lines, s, boost::is_any_of("\n"), boost::token_compress_on);
+    for (const auto &e: lines)
+    {
+      std::vector<std::pair<std::string, size_t>> new_lines = split_line_by_width(e, columns);
+      for (auto &l: new_lines)
+        all_lines.push_back(std::move(l));
+    }
+    return all_lines;
+  }
 }