Setup ed the posix line editor.

2026-08-09 16:31:09 +01:00
parent 717c048d6f
commit f044f69f1c
13 changed files with 820 additions and 72 deletions
@@ -4,6 +4,84 @@
 #include "pch.h"

 namespace crib::commands::ed {
+struct ed_error : std::runtime_error {
+  ed_error(const char *msg) : std::runtime_error(msg) {}
+};
+
+struct Command {
+  enum struct Type : uint8_t {
+    Invalid,
+    Quit,
+    ForceQuit,
+    PromptToggle,
+    HelpToggle,
+    Help,
+    Print,
+    Number,
+    Append,
+    Change,
+    Delete,
+    Write,
+    Dump,
+    None
+  } type;
+
+  struct Address {
+    enum struct Type : uint8_t {
+      None,
+      Current,
+      Last,
+      Number,
+      Mark,
+      SearchForward,
+      SearchBackward
+    } type;
+    int64_t number = 0;
+    std::string regex = "";
+    int64_t offset = 0;
+    char mark = '\0';
+  };
+
+  Address start{};
+  Address end{};
+  static constexpr uint8_t SEMICOLON = 0b01;
+  static constexpr uint8_t RANGE = 0b10;
+  uint8_t address_flags = 0;
+  char suffix = '\0';
+  std::string argument;
+};
+
+struct Ed {
+  crib::internal::vase::Vase vase;
+  uint64_t line = 0;
+  bool modified = false;
+  bool quitting = false;
+  uint64_t marks[26]{0};
+  std::string last_regex = "";
+  bool help_mode = false;
+  bool suppress_mode = false;
+  bool prompt_mode = false;
+  std::string prompt = "*";
+  std::string last_message = "";
+
+  Ed(std::filesystem::path file, bool suppress_mode, std::string prompt_)
+      : vase(file, "/tmp"), suppress_mode(suppress_mode), prompt(prompt_) {
+    if (prompt == "")
+      prompt = "*";
+    else
+      prompt_mode = true;
+    line = vase.lines();
+    std::cout << vase.length() << std::endl;
+  }
+
+  void parse_address(std::string_view cmd, uint64_t &i, Command::Address &addr);
+  void resolve_address(Command::Address addr, uint64_t *out_line);
+  Command parse(std::string cmd, bool eof);
+  void append(std::string text, uint64_t line);
+  void remove(uint64_t start_line, uint64_t end_line);
+  bool handle(std::string cmd, bool eof);
+};
+
 std::string summary();
 void help();
 void run(std::vector<std::string>);