exception: refactoring

src/buffer_manager.cc

@@ -1,14 +1,15 @@
 #include "buffer_manager.hh"
 
+#include <cassert>
+
 #include "buffer.hh"
 #include "window.hh"
-#include <cassert>
+#include "exception.hh"
 
 namespace Kakoune
 {
 
-struct name_not_unique {};
-
+struct name_not_unique : logic_error {};
 
 BufferManager* BufferManager::ms_instance = nullptr;
 

src/command_manager.cc

@@ -37,10 +37,10 @@ static std::vector<std::string> split(const std::string& line)
     return result;
 }
 
-struct command_not_found : public std::runtime_error
+struct command_not_found : runtime_error
 {
-    command_not_found(const std::string& what)
-        : std::runtime_error("command not found: " + what) {}
+    command_not_found(const std::string& command)
+        : runtime_error(command + " : no such command") {}
 };
 
 void CommandManager::execute(const std::string& command_line)

src/command_manager.hh

@@ -4,17 +4,17 @@
 #include <string>
 #include <vector>
 #include <unordered_map>
-#include <stdexcept>
 #include <functional>
 
+#include "exception.hh"
+
 
 namespace Kakoune
 {
 
-struct wrong_argument_count : public std::runtime_error
+struct wrong_argument_count : runtime_error
 {
-    wrong_argument_count()
-        : std::runtime_error("wrong argument count") {}
+    wrong_argument_count() : runtime_error("wrong argument count") {}
 };
 
 typedef std::vector<std::string> CommandParameters;

src/exception.cc

@@ -0,0 +1,14 @@
+#include "exception.hh"
+
+#include <string>
+#include <typeinfo>
+
+namespace Kakoune
+{
+
+std::string exception::description() const
+{
+    return typeid(*this).name();
+}
+
+}

src/exception.hh

@@ -0,0 +1,32 @@
+#ifndef exception_hh_INCLUDED
+#define exception_hh_INCLUDED
+
+#include <string>
+
+namespace Kakoune
+{
+
+struct exception
+{
+    virtual ~exception() {}
+    virtual std::string description() const;
+};
+
+struct runtime_error : exception
+{
+    runtime_error(const std::string description)
+        : m_description(description) {}
+
+    std::string description() const { return m_description; }
+
+private:
+    std::string m_description;
+};
+
+struct logic_error : exception
+{
+};
+
+}
+
+#endif // exception_hh_INCLUDED

src/file.cc

@@ -1,5 +1,7 @@
 #include "file.hh"
+
 #include "buffer.hh"
+#include "buffer_manager.hh"
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -16,9 +18,9 @@ Buffer* create_buffer_from_file(const std::string& filename)
     if (fd == -1)
     {
         if (errno == ENOENT)
-            throw file_not_found(strerror(errno));
+            throw file_not_found(filename);
 
-        throw open_file_error(strerror(errno));
+        throw file_access_error(filename, strerror(errno));
     }
 
     std::string content;
@@ -32,6 +34,10 @@ Buffer* create_buffer_from_file(const std::string& filename)
         content += std::string(buf, size);
     }
     close(fd);
+
+    if (Buffer* buffer = BufferManager::instance().get_buffer(filename))
+        BufferManager::instance().delete_buffer(buffer);
+
     return new Buffer(filename, content);
 }
 
@@ -39,7 +45,7 @@ void write_buffer_to_file(const Buffer& buffer, const std::string& filename)
 {
     int fd = open(filename.c_str(), O_CREAT | O_WRONLY, 0644);
     if (fd == -1)
-        throw open_file_error(strerror(errno));
+        throw file_access_error(filename, strerror(errno));
 
     const BufferString& content = buffer.content();
     ssize_t count = content.length() * sizeof(BufferChar);
@@ -52,7 +58,7 @@ void write_buffer_to_file(const Buffer& buffer, const std::string& filename)
         count -= written;
 
         if (written == -1)
-            throw write_file_error(strerror(errno));
+            throw file_access_error(filename, strerror(errno));
     }
     close(fd);
 }

src/file.hh

@@ -2,27 +2,24 @@
 #define file_hh_INCLUDED
 
 #include <string>
-#include <stdexcept>
+
+#include "exception.hh"
 
 namespace Kakoune
 {
 
-struct open_file_error : public std::runtime_error
+struct file_access_error : runtime_error
 {
-    open_file_error(const std::string& what)
-        : std::runtime_error(what) {}
+public:
+    file_access_error(const std::string& filename,
+                      const std::string& error_desc)
+        : runtime_error(filename + ": " + error_desc) {}
 };
 
-struct file_not_found : public open_file_error
+struct file_not_found : file_access_error
 {
-    file_not_found(const std::string& what)
-        : open_file_error(what) {}
-};
-
-struct write_file_error : public std::runtime_error
-{
-    write_file_error(const std::string& what)
-        : std::runtime_error(what) {}
+    file_not_found(const std::string& filename)
+        : file_access_error(filename, "file not found") {}
 };
 
 class Buffer;

src/main.cc

@@ -216,10 +216,6 @@ void do_command()
         command_manager.execute(prompt(":"));
     }
     catch (prompt_aborted&) {}
-    catch (std::runtime_error& err)
-    {
-        print_status(err.what());
-    }
 }
 
 bool is_blank(char c)
@@ -270,7 +266,6 @@ void do_search(Window& window)
         std::string ex = prompt("/");
         window.select(false, RegexSelector(ex));
     }
-    catch (boost::regex_error&) {}
     catch (prompt_aborted&) {}
 }
 
@@ -313,18 +308,25 @@ int main()
         int count = 0;
         while(not quit_requested)
         {
-            char c = getch();
-
-            if (isdigit(c))
-                count = count * 10 + c - '0';
-            else
+            try
             {
-                if (keymap.find(c) != keymap.end())
+                char c = getch();
+
+                if (isdigit(c))
+                    count = count * 10 + c - '0';
+                else
                 {
-                    keymap[c](*current_window, count);
-                    draw_window(*current_window);
+                    if (keymap.find(c) != keymap.end())
+                    {
+                        keymap[c](*current_window, count);
+                        draw_window(*current_window);
+                    }
+                    count = 0;
                 }
-                count = 0;
+            }
+            catch (Kakoune::runtime_error& error)
+            {
+                print_status(error.description());
             }
         }
         deinit_ncurses();

src/regex_selector.cc

@@ -1,6 +1,5 @@
 #include "regex_selector.hh"
-
-void print_status(const std::string&);
+#include "exception.hh"
 
 namespace Kakoune
 {
@@ -21,7 +20,7 @@ Selection RegexSelector::operator()(const BufferIterator& cursor) const
     }
     catch (boost::regex_error& err)
     {
-        print_status("regex error");
+        throw runtime_error("regex error");
     }
 
     return Selection(cursor, cursor);