Add helper function to get interface names from CLI

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 092f113..c2208c6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -10,6 +10,22 @@ R"(Usage: getif [INTERFACE ...]
 --version     Show version.
 )";
 
+std::vector<std::string>
+get_interface_names(std::map<std::string, docopt::value>& args)
+{
+    auto it = args.find("INTERFACE");
+    if (it != args.end()) {
+        if (it->second.isStringList()) {
+            return it->second.asStringList();
+        } else {
+            std::cerr << "Argument parsing error." << std::endl;
+            exit(1); // exit is okay, because this is main.cpp
+        }
+    } else {
+        return {};
+    }
+}
+
 int main(int argc, const char** argv) {
     std::map<std::string, docopt::value> args
         = docopt::docopt(USAGE,