Add basic "write to file" support.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/ae6c183475d

Editor/Document.cpp

@@ -3,7 +3,7 @@
 
 OwnPtr<Document> Document::create_from_file(const std::string& path)
 {
-    auto document = make<Document>();
+    auto document = make<Document>(path);
 
     FileReader reader(path);
     while (reader.can_read()) {

Editor/Document.h

@@ -8,9 +8,11 @@
 
 class Document {
 public:
-    Document() { }
+    explicit Document(const std::string& path) : m_path(path) { }
     ~Document() { }
 
+    std::string path() const { return m_path; }
+
     Line& line(size_t index) { return *m_lines[index]; }
     const Line& line(size_t index) const { return *m_lines[index]; }
     size_t line_count() const { return m_lines.size(); }
@@ -25,4 +27,5 @@ public:
 
 private:
     std::deque<OwnPtr<Line>> m_lines;
+    std::string m_path;
 };

Editor/Editor.cpp

@@ -3,15 +3,14 @@
 #include "InsertOperation.h"
 
 #define _XOPEN_SOURCE_EXTENDED
-#include <locale.h>
 #include <ncurses.h>
+#include <stdarg.h>
 
 static int statusbar_attributes;
 static int ruler_attributes;
 
 Editor::Editor()
 {
-    setlocale(LC_ALL, "");
     initscr();
     start_color();
     use_default_colors();
@@ -160,6 +159,28 @@ int Editor::exec()
     return 0;
 }
 
+void Editor::write_to_file()
+{
+    FILE* fp = fopen(m_document->path().c_str(), "w");
+    if (!fp) {
+        set_status_text("Failed to open %s for writing", m_document->path().c_str());
+        return;
+    }
+
+    size_t bytes = 0;
+    for (size_t i = 0; i < m_document->line_count(); ++i) {
+        fwrite(m_document->line(i).data().c_str(), sizeof(char), m_document->line(i).length(), fp);
+        bytes += m_document->line(i).length();
+        if (i != m_document->line_count() - 1) {
+            fputc('\n', fp);
+            ++bytes;
+        }
+    }
+
+    fclose(fp);
+    set_status_text("Wrote %zu bytes across %zu lines", bytes, m_document->line_count());
+}
+
 void Editor::move_left()
 {
     if (m_cursor.column() == 0)
@@ -329,6 +350,16 @@ void Editor::set_status_text(const std::string& text)
     m_status_text = text;
 }
 
+void Editor::set_status_text(const char* fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    char buf[128];
+    vsnprintf(buf, sizeof(buf), fmt, ap);
+    va_end(ap);
+    m_status_text = buf;
+}
+
 void Editor::exec_command()
 {
     if (m_command == "q") {
@@ -336,6 +367,11 @@ void Editor::exec_command()
         return;
     }
 
+    if (m_command == "w") {
+        write_to_file();
+        return;
+    }
+
     if (m_command == "about") {
         set_status_text("cuki editor!");
         return;

Editor/Editor.h

@@ -30,6 +30,7 @@ public:
     bool is_idle() const { return m_mode == Idle; }
 
     void set_status_text(const std::string&);
+    void set_status_text(const char* fmt, ...);
 
     bool insert_text_at_cursor(const std::string&);
     bool remove_text_at_cursor(const std::string&);
@@ -57,6 +58,7 @@ private:
 
     void exec_command();
     void coalesce_current_line();
+    void write_to_file();
 
     OwnPtr<Document> m_document;