DRY cin input_line (and test replacement of non-DRY usage)

src/common/command_line.cpp

@@ -3,9 +3,21 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "command_line.h"
+#include "string_tools.h"
 
 namespace command_line
 {
+  std::string input_line(const std::string& prompt)
+  {
+    std::cout << prompt;
+
+    std::string buf;
+    std::getline(std::cin, buf);
+
+    return epee::string_tools::trim(buf);
+
+  }
+
   const arg_descriptor<bool> arg_help = {"help", "Produce help message"};
   const arg_descriptor<bool> arg_version = {"version", "Output version information"};
   const arg_descriptor<std::string> arg_data_dir = {"data-dir", "Specify data directory"};

src/common/command_line.h

@@ -14,6 +14,9 @@
 
 namespace command_line
 {
+
+  std::string input_line(const std::string& prompt);
+
   template<typename T, bool required = false>
   struct arg_descriptor;
 

src/simplewallet/simplewallet.cpp

@@ -212,12 +212,10 @@ bool simple_wallet::ask_wallet_create_if_needed()
 {
   std::string wallet_path;
 
-  std::cout << "Specify wallet file name (e.g., wallet.bin). If the wallet doesn't exist, it will be created.\n";
-  std::cout << "Wallet file name: ";
-
-  std::getline(std::cin, wallet_path);
-
-  wallet_path = string_tools::trim(wallet_path);
+  wallet_path = command_line::input_line(
+      "Specify wallet file name (e.g., wallet.bin). If the wallet doesn't exist, it will be created.\n"
+      "Wallet file name: "
+  );
 
   bool keys_file_exists;
   bool wallet_file_exists;