fix mismatch between var name and program behavior, add "cellar translate" command

src/core/commands.txt

@@ -1,2 +1,3 @@
+translate translate_command Translates a path from Windows-y to POSIX or vice versa.
 version print_version Prints version information.
 help help_command Hello, there!

src/core/paths.cpp

@@ -1,31 +1,35 @@
 #include <exception>
+#include <iostream>
 #include <string>
+#include <vector>
 #include <regex>
 
 #include <boost/algorithm/string.hpp>
 
 #include "output.hpp"
 #include "paths.hpp"
+#include "internal/core.hpp"
 
+using namespace std;
 using namespace cellar;
 
-std::string cellar::paths::translate(std::string in_path, bool lazy) {
-    bool posix_input;
+string cellar::paths::translate(std::string in_path, bool lazy) {
+    bool windows_input;
 
-    static std::regex drive_letter(R"([a-zA-Z]:\\)");
+    static regex drive_letter(R"([a-zA-Z]:\\)");
 
-    posix_input = ! std::regex_match(in_path.substr(0, 3), drive_letter);
+    windows_input = regex_match(in_path.substr(0, 3), drive_letter);
 
     if (!lazy) {
         output::warning("non-lazy path translation is not implemented yet");
     }
 
-    if (posix_input) {
+    if (windows_input) {
         // lazy
         if (boost::algorithm::to_lower_copy(in_path.substr(0,1)) != "z") {
-            throw std::invalid_argument("lazy path translation isn't possible for drive letters other than Z:");
+            throw invalid_argument("lazy path translation isn't possible for drive letters other than Z:");
         }
-        std::string out_path = in_path.substr(2, in_path.size() - 2);
+        string out_path = in_path.substr(2, in_path.size() - 2);
         
         size_t slashpos = out_path.find("\\");
         while (slashpos != std::string::npos) {
@@ -36,7 +40,7 @@ std::string cellar::paths::translate(std::string in_path, bool lazy) {
         return out_path;
     } else {
         // lazy
-        std::string out_path = "Z:";
+        string out_path = "Z:";
         out_path.append(in_path);
 
         size_t slashpos = out_path.find("/");
@@ -48,3 +52,17 @@ std::string cellar::paths::translate(std::string in_path, bool lazy) {
         return out_path;
     }
 }
+
+void cellar::core::translate_command(int argc, vector<string> argv) {
+    if (argv.size() < 2) {
+        output::error("pass an argument");
+        return;
+    }
+
+    // TODO: tclap me later
+    vector<string> pathargs(argv.cbegin() + 1, argv.cend());
+
+    for (auto arg : pathargs) {
+        cout << paths::translate(arg) << endl;
+    }
+}