Setup ed the posix line editor.

src/commands/ed/ed.cc

@@ -1,11 +1,40 @@
 #include "commands/ed/ed.h"
+#include "cli.h"
 
 namespace crib::commands::ed {
 std::string summary() {
   return "A POSIX-compliant line editor.";
 }
+
 void help() {}
+
 void run(std::vector<std::string> args) {
-  return;
+  std::string prompt = "";
+  std::filesystem::path filepath;
+  bool suppress = false;
+  for (size_t i = 1; i < args.size(); i++) {
+    if (args[i] == "-p") {
+      i++;
+      if (i >= args.size())
+        throw crib::cli::cli_error("Prompt not specified!", 1);
+      prompt = args[i];
+    } else if (args[i] == "-s") {
+      suppress = true;
+    } else {
+      if (filepath.string().size())
+        throw crib::cli::cli_error("Invalid arguments given.", 1);
+      filepath = args[i];
+    }
+  }
+  Ed ed(filepath, suppress, prompt);
+  std::string command;
+  while (true) {
+    std::string cmd;
+    if (ed.prompt_mode)
+      std::cout << ed.prompt;
+    bool eof = !std::getline(std::cin, cmd);
+    if (!ed.handle(cmd, eof))
+      return;
+  }
 }
 } // namespace crib::commands::ed