add utf8_char_t struct

include/append_buffer.h

@@ -5,7 +5,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-void abAppend(struct abuf *ab, const char *s, int len);
+void abAppend(struct abuf *ab, const unsigned char *s, int len);
 
 void abFree(struct abuf *ab);
 

include/data.h

@@ -7,6 +7,12 @@
 
 #include "lisp.h"
 
+
+typedef struct{
+  unsigned char c[4];
+  char len;
+} utf_8_char_t;
+
 /**
  * \struct erow
  * \brief Store one editor row
@@ -16,8 +22,8 @@
 typedef struct erow {
   int size;     /**< Size of the line */
   int rsize;    /**< Size of the render line */
-  char *chars;  /**< Characters of the line */
-  char *render; /**< The actual line we will print */
+  utf_8_char_t *chars;  /**< Characters of the line */
+  utf_8_char_t *render; /**< The actual line we will print */
 } erow;
 
 enum editorStatus_e {
@@ -31,10 +37,45 @@ struct const_t {
   int QUIT_TIMES;
 };
 
+// Key types
+typedef enum {
+    KEY_CHAR,           // Regular character or UTF-8
+    KEY_CTRL,           // Ctrl+letter
+    KEY_ALT,            // Alt+letter
+    KEY_ARROW,          // Arrow keys
+    KEY_FUNCTION,       // Function keys
+    KEY_SPECIAL,        // Tab, Enter, ESC, Backspace, etc.
+    KEY_NAVIGATION,     // Home, End, PgUp, PgDn, Insert, Delete
+    KEY_UNKNOWN
+} KeyType;
+
+// Modifiers
+typedef enum {
+    MOD_NONE = 0,
+    MOD_SHIFT = 1,
+    MOD_ALT = 2,
+    MOD_CTRL = 4
+} KeyModifier;
+
+// Key information structure
+typedef struct {
+    KeyType type;
+    int modifiers;      // Bitmask of KeyModifier
+    union {
+        unsigned int codepoint;  // For KEY_CHAR
+        char ctrl_char;          // For KEY_CTRL (A-Z)
+        char alt_char;           // For KEY_ALT
+        char arrow;              // For KEY_ARROW (U/D/L/R)
+        int function_num;        // For KEY_FUNCTION (1-12)
+        char special;            // For KEY_SPECIAL and KEY_NAVIGATION
+    } data;
+    utf_8_char_t c;  // Raw bytes
+} KeyInfo;
+
+
 struct keyBind_t {
-  char *key_sequence;
+  KeyInfo *key_sequence;
   Lisp command;
-  
 };
 
 /**
@@ -77,7 +118,7 @@ struct editorConfig {
  * */
 
 struct abuf {
-  char *b; /**< Text that will be printed */
+  unsigned char *b; /**< Text that will be printed */
   int len; /**< Length of the text */
 };
 

include/define.h

@@ -8,19 +8,10 @@
 #define HIDE_CURSOR "\x1b[?25l"
 #define SHOW_CURSOR "\x1b[?25h"
 #define ERASE_END_LINE "\x1b[K"
+#define TAB "\x09"
+#define SPACE "\x20"
+
 
-enum editorKey {
-  BACKSPACE = 127,
-  ARROW_LEFT = 1000,
-  ARROW_RIGHT,
-  ARROW_UP,
-  ARROW_DOWN,
-  DEL_KEY,
-  BEG_LINE,
-  END_LINE,
-  PAGE_UP,
-  PAGE_DOWN,
-};
 
 #define ABUF_INIT {NULL, 0}
 

include/editor_op.h

@@ -2,9 +2,9 @@
 #define EDITOR_OP_H_
 
 #include "data.h"
-void editorInsertChar(int c);
+void editorInsertChar(utf_8_char_t *c);
 
-void editorInsertNewLine();
+void editorInsertNewLine(void);
 
 void editorDelChar();
 

include/input.h

@@ -24,9 +24,9 @@ char *editorPrompt(char *prompt, char * PlaceHolder, char bPathMode);
 
 char *key_to_string(int key);
 
-void editorMoveCursor(int key);
+void editorMoveCursor(KeyInfo * key);
 
-int executeKeyBind(char *key_sequence);
+int executeKeyBind(KeyInfo *key_sequence);
 
 /**
  * \fn void editorProcessKeypress()

include/row_op.h

@@ -20,7 +20,7 @@ void editorFreeRow(erow *row);
 
 void editorDelRow(int at);
 
-void editorRowInsertChar(erow *row, int at, int c);
+void editorRowInsertChar(erow *row, int at, utf_8_char_t c);
 
 void editorRowAppendString(erow *row, char *s, size_t len);
 

include/terminal.h

@@ -25,10 +25,12 @@ void disableRawMode();
 
 void enableRawMode();
 
-int editorReadKey();
+KeyInfo * editorReadKey();
 
 int getCursorPosition(int *rows, int *cols);
 
+KeyInfo *stringToCodepoint(const char *string);
+
 int getWindowSize(int *rows, int *cols);
 
 #endif

install.sh

@@ -17,6 +17,7 @@ fi
 echo "Create config files ..."
 mkdir -pv ~/.beluga/
 cp -rv ./assets/ ~/.beluga/
+mkdir -pv ~/.beluga/config/
 mkdir -pv ~/.beluga/packages/
 
 read -p "Do you want to replace your config file or keep it (init.lisp.bak) / (init.lisp.new) ? (Y/n)" confirm

main.c

@@ -21,11 +21,19 @@
 #include "include/output.h"
 #include "include/terminal.h"
 
+#include <locale.h>
+#include <wchar.h>
+
 struct editorConfig E;
 
 int main(int argc, char *argv[]) {
 
   char * splash_screen = (char *) calloc(256, sizeof(char));
+
+  // Set support for utf-8
+  setlocale(LC_ALL, "");
+
+  // INIT
   
   enableRawMode();
   initEditor();

src/append_buffer.c

@@ -2,8 +2,8 @@
 
 extern struct editorConfig E;
 
-void abAppend(struct abuf *ab, const char *s, int len) {
-  char *new = realloc(ab->b, ab->len + len);
+void abAppend(struct abuf *ab, const unsigned char *s, int len) {
+  unsigned char *new = realloc(ab->b, ab->len + len);
 
   if (new == NULL) {
     return;

src/builtins.c

@@ -5,22 +5,31 @@
 #include "../include/editor_op.h"
 #include "../include/row_op.h"
 #include "../include/data.h"
+#include "../include/terminal.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+utf_8_char_t make_utf8_char(const char *bytes, int len) {
+  utf_8_char_t ch;
+  ch.len = len;
+  memcpy(ch.c, bytes, len);
+  return ch;
+}
+
 Lisp mapKey(Lisp args, LispError *e, LispContext ctx) {
-  const char *key_sequence = lisp_string(lisp_car(args));
+  const char *key_string = lisp_string(lisp_car(args));
+  KeyInfo *key = stringToCodepoint(key_string);
   args = lisp_cdr(args);
   // second argument
   Lisp func = lisp_car(args);
 
   E.key_binds =
       (struct keyBind_t *)realloc(E.key_binds, ++E.number_of_keybinds * sizeof(struct keyBind_t));
-  E.key_binds[E.number_of_keybinds - 1].key_sequence = (char *) malloc(50 * sizeof(char));
+  E.key_binds[E.number_of_keybinds - 1].key_sequence = (KeyInfo *) malloc(sizeof(KeyInfo));
 
-  strncpy(E.key_binds[E.number_of_keybinds - 1].key_sequence, key_sequence, 50);
+  memcpy(E.key_binds[E.number_of_keybinds - 1].key_sequence, key, sizeof(KeyInfo));
 
   E.key_binds[E.number_of_keybinds - 1].command = func;
 
@@ -29,26 +38,30 @@ Lisp mapKey(Lisp args, LispError *e, LispContext ctx) {
 
 Lisp moveCursor(Lisp args, LispError *e, LispContext ctx) {
   const char *direction = lisp_string(lisp_car(args));
+  KeyInfo key;
+  key.type = KEY_ARROW; 
   switch (direction[0]) {
   case 'u':
-    editorMoveCursor(ARROW_UP);
+    key.data.arrow = 'A';
     break;
   case 'd':
-    editorMoveCursor(ARROW_DOWN);
+    key.data.arrow = 'B';
     break;
   case 'r':
-    editorMoveCursor(ARROW_RIGHT);
+    key.data.arrow = 'C';
     break;
   case 'l':
-    editorMoveCursor(ARROW_LEFT);
+    key.data.arrow = 'D';
     break;
   }
+  editorMoveCursor(&key);
 
 
   return lisp_null();
 }
 
 Lisp editorQuit(Lisp args, LispError* e, LispContext ctx) {
+  fprintf(stderr, "quit\n");
   if (E.dirty && E.quit_times_buffer > 0) {
     editorSetStatusMessage("WARNING! Changes hasn't been saved. Press Ctrl-Q "
                            "another time to quit.");
@@ -77,7 +90,7 @@ Lisp l_editorSave(Lisp args, LispError* e, LispContext ctx) {
 
 Lisp l_editorInsertNewLine(Lisp args, LispError* e, LispContext ctx) {
 
-  editorInsertNewLine();
+  // editorInsertNewLine();
   
   return lisp_null();
 
@@ -105,8 +118,11 @@ Lisp deletePreviousChar(Lisp args, LispError* e, LispContext ctx) {
 Lisp editorMoveCursorPageUp(Lisp args, LispError* e, LispContext ctx) {
   E.cursor_y = E.row_offset;
   int times = E.screenrows;
+  KeyInfo key;
+  key.type = KEY_ARROW;
+  key.data.arrow = 'D';
   while (--times) {
-    editorMoveCursor(ARROW_UP);
+    editorMoveCursor(&key);
   }
   return lisp_null();
 }
@@ -117,8 +133,11 @@ Lisp editorMoveCursorPageDown(Lisp args, LispError* e, LispContext ctx) {
     E.cursor_y = E.numrows;
   }
   int times = E.screenrows;
+  KeyInfo key;
+  key.type = KEY_ARROW;
+  key.data.arrow = 'D';
   while (--times) {
-    editorMoveCursor(ARROW_DOWN);
+    editorMoveCursor(&key);
   }
 
   return lisp_null();
@@ -134,8 +153,9 @@ Lisp editorOpenFile(Lisp args, LispError *e, LispContext ctx) {
 
 
 Lisp editorPrintC(Lisp args, LispError *e, LispContext ctx) {
-  char c = lisp_string(lisp_car(args))[0];
-  editorInsertChar(c);
+  char *c = lisp_string(lisp_car(args));
+  utf_8_char_t ch = make_utf8_char(c, 1);
+  editorInsertChar(&ch);
   return lisp_null();
 }
 
@@ -168,7 +188,8 @@ Lisp editorFind_L(Lisp args, LispError *e, LispContext ctx) {
 }
 
 Lisp editorReadChar_L(Lisp args, LispError *e, LispContext ctx) {
-	fprintf(stderr, "char read : %c\n", E.row[E.cursor_y].render[E.cursor_x]);
-	return lisp_make_char(E.row[E.cursor_y].render[E.cursor_x]);
+  // fprintf(stderr, "char read : %c\n", E.row[E.cursor_y].render[E.cursor_x]);
+  //  return lisp_make_char(E.row[E.cursor_y].render[E.cursor_x]);
+  return lisp_null();
 }
 

src/editor_op.c

@@ -1,47 +1,94 @@
 #include "../include/editor_op.h"
 #include "../include/row_op.h"
+#include "include/data.h"
+#include <stdio.h>
 
 
 extern struct editorConfig E;
 
-void editorInsertChar(int c) {
-    if (E.cursor_y == E.numrows) {
-      editorInsertRow(E.numrows, "", 0);
-    }
-    editorRowInsertChar(&E.row[E.cursor_y], E.cursor_x, c);
-    E.cursor_x++;
+void editorInsertChar(utf_8_char_t *c) {
+  if (E.state == READ_ONLY) return;
+  fprintf(stderr, "Insert char %s %d\n", c->c, c->len);
+  // If cursor is past end of file, add empty rows
+  if (E.cursor_y == E.numrows) {
+    editorInsertRow(E.numrows, "", 0);
+  }
+  
+  // Insert character at cursor position
+  editorRowInsertChar(&E.row[E.cursor_y], E.cursor_x, *c);
+  E.cursor_x++;
 }
 
-void editorInsertNewLine() {
-  erow *row;
-  if (!E.cursor_x) {
+void editorInsertNewline(void) {
+  if (E.state == READ_ONLY) return;
+  
+  if (E.cursor_x == 0) {
+    // Insert blank line before current line
     editorInsertRow(E.cursor_y, "", 0);
   } else {
-    row = &E.row[E.cursor_y];
-    editorInsertRow(E.cursor_y + 1, &row->chars[E.cursor_x],
-                    row->size - E.cursor_x);
-    row = &E.row[E.cursor_y];
+    // Split current line at cursor
+    erow *row = &E.row[E.cursor_y];
+    
+    // Calculate byte length of remaining part
+    int remaining_chars = row->size - E.cursor_x;
+    
+    // Allocate buffer for remaining characters
+    char *buf = malloc(remaining_chars * 4); // Max 4 bytes per UTF-8 char
+    int buf_len = 0;
+    
+    // Convert utf_8_char_t to bytes
+    for (int i = E.cursor_x; i < row->size; i++) {
+      for (int j = 0; j < row->chars[i].len; j++) {
+        buf[buf_len++] = row->chars[i].c[j];
+      }
+    }
+    
+    // Insert new row with remaining text
+    editorInsertRow(E.cursor_y + 1, buf, buf_len);
+    free(buf);
+    
+    // Truncate current row at cursor
+    row = &E.row[E.cursor_y]; // Refresh pointer after realloc
     row->size = E.cursor_x;
-    row->chars[row->size] = '\0';
     editorUpdateRow(row);
   }
-  ++E.cursor_y;
+  
+  E.cursor_y++;
   E.cursor_x = 0;
 }
 
-void editorDelChar() {
-  erow *row;
-  if (E.cursor_y == E.numrows || !(E.cursor_x || E.cursor_y)) {
-    return;
-  }
-  row = &E.row[E.cursor_y];
+void editorRowAppendRow(erow *dest, erow *src) {
+  // Allocate space for combined rows
+  utf_8_char_t *new_chars = realloc(dest->chars, 
+                                     sizeof(utf_8_char_t) * (dest->size + src->size));
+  if (!new_chars) return;
+  
+  dest->chars = new_chars;
+  
+  // Copy source row characters
+  memcpy(&dest->chars[dest->size], src->chars, sizeof(utf_8_char_t) * src->size);
+  dest->size += src->size;
+  
+  editorUpdateRow(dest);
+  ++E.dirty;
+}
+
+void editorDelChar(void) {
+  if (E.state == READ_ONLY) return;
+  if (E.cursor_y == E.numrows) return;
+  if (E.cursor_x == 0 && E.cursor_y == 0) return;
+  
+  erow *row = &E.row[E.cursor_y];
+  
   if (E.cursor_x > 0) {
+    // Delete character before cursor
     editorRowDelchar(row, E.cursor_x - 1);
-    --E.cursor_x;
+    E.cursor_x--;
   } else {
+    // At beginning of line - join with previous line
     E.cursor_x = E.row[E.cursor_y - 1].size;
-    editorRowAppendString(&E.row[E.cursor_y - 1], row->chars, row->size);
+    editorRowAppendRow(&E.row[E.cursor_y - 1], row);
     editorDelRow(E.cursor_y);
-    --E.cursor_y;
+    E.cursor_y--;
   }
 }

src/file_io.c

@@ -7,6 +7,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <errno.h>
 
 extern char *strdup(const char *);
 extern ssize_t getline(char **restrict lineptr, size_t *restrict n,
@@ -14,37 +15,56 @@ extern ssize_t getline(char **restrict lineptr, size_t *restrict n,
 extern int ftruncate(int fd, off_t length);
 extern struct editorConfig E;
 
+// Convert utf_8_char_t array to byte string
 char *editorRowsToString(int *buffer_len) {
     int tot_len = 0;
-    int j;
+    int j, i;
     char *buf;
     char *p;
 
+    // Calculate total byte length (not character count)
     for (j = 0; j < E.numrows; ++j) {
-        tot_len += E.row[j].size + 1;
+        // Count actual bytes in each character
+        for (i = 0; i < E.row[j].size; i++) {
+            tot_len += E.row[j].chars[i].len;
+        }
+        tot_len++; // For newline
     }
+    
     *buffer_len = tot_len;
     buf = malloc(tot_len);
+    if (!buf) return NULL;
+    
     p = buf;
     for (j = 0; j < E.numrows; ++j) {
-        memcpy(p, E.row[j].chars, E.row[j].size);
-        p += E.row[j].size;
-        *p = '\n';
-        p++;
+        // Copy each character's bytes
+        for (i = 0; i < E.row[j].size; i++) {
+            for (int k = 0; k < E.row[j].chars[i].len; k++) {
+                *p++ = E.row[j].chars[i].c[k];
+            }
+        }
+        *p++ = '\n';
     }
 
     return buf;
 }
 
 void editorCloseFile(void) {
+    // Free all rows
+    for (int i = 0; i < E.numrows; i++) {
+        editorFreeRow(&E.row[i]);
+    }
+    
     E.cursor_x = 0;
     E.cursor_y = 0;
     E.rx = 0;
     E.row_offset = 0;
     E.col_offset = 0;
     E.numrows = 0;
+    free(E.row);
     E.row = NULL;
     E.dirty = 0;
+    free(E.filename);
     E.filename = NULL;
     E.status_msg[0] = '\0';
     E.status_msg_time = 0;
@@ -56,25 +76,29 @@ void editorOpen(char *filename) {
     // Test if a file is already open
     if (E.filename != NULL) {
         editorCloseFile();
-        E.state = READ_AND_WRITE;
     }
+    E.state = READ_AND_WRITE;
 
-    free(E.filename);
     E.filename = strdup(filename);
 
-    fp = fopen(filename, "a+");
-    if (!fp)
-        die("fopen");
+    fp = fopen(filename, "r");
+    if (!fp) {
+        // File doesn't exist - that's okay, we'll create it on save
+        E.dirty = 0;
+        return;
+    }
 
     char *line = NULL;
     size_t line_cap = 0;
     ssize_t line_len;
 
     while ((line_len = getline(&line, &line_cap, fp)) != -1) {
+        // Strip newline characters
         while (line_len > 0 &&
                (line[line_len - 1] == '\n' || line[line_len - 1] == '\r')) {
             --line_len;
         }
+        // editorInsertRow will convert bytes to utf_8_char_t
         editorInsertRow(E.numrows, line, line_len);
     }
     free(line);
@@ -86,6 +110,7 @@ void editorSave() {
     int len;
     char *buf;
     int fd;
+    
     if (E.filename == NULL) {
         E.filename = editorPrompt("Save as: %s (ESC to cancel)", "", 1);
         if (E.filename == NULL) {
@@ -93,38 +118,100 @@ void editorSave() {
             return;
         }
     }
+    
     buf = editorRowsToString(&len);
-    fd = open(E.filename, O_RDWR | O_CREAT, 0644);
+    if (!buf) {
+        editorSetStatusMessage("Can't save! Memory error");
+        return;
+    }
+    
+    fd = open(E.filename, O_RDWR | O_CREAT | O_TRUNC, 0644);
     if (fd != -1) {
-        if (ftruncate(fd, len) != -1) {
-            if (write(fd, buf, len) == len) {
-                close(fd);
-                free(buf);
-                E.dirty = 0;
-                editorSetStatusMessage("%d bytes written to disk", len);
-                return;
-            }
+        if (write(fd, buf, len) == len) {
+            close(fd);
+            free(buf);
+            E.dirty = 0;
+            editorSetStatusMessage("%d bytes written to disk", len);
+            return;
         }
         close(fd);
     }
+    
     free(buf);
     editorSetStatusMessage("Can't save! I/O error: %s", strerror(errno));
 }
 
-void editorFind() {
-  char *query = editorPrompt("Search: %s (ESC to cancel)", "", 0);
-  if (query == NULL) return;
-  int i;
-  for (i = E.cursor_y + 1; i < E.numrows; i++) {
-    erow *row = &E.row[i];
-    char *match = strstr(row->render, query);
-    if (match) {
-      E.cursor_y = i;
-      E.cursor_x = editorRowRxToCx(row, match - row->render);
-      E.row_offset = E.numrows;
-      break;
+// Helper to convert utf_8_char_t array to byte string for searching
+static char *row_to_string(erow *row) {
+    // Calculate byte length
+    int byte_len = 0;
+    for (int i = 0; i < row->rsize; i++) {
+        byte_len += row->render[i].len;
     }
-  }
-  free(query);
+    
+    char *str = malloc(byte_len + 1);
+    if (!str) return NULL;
+    
+    // Convert to bytes
+    int pos = 0;
+    for (int i = 0; i < row->rsize; i++) {
+        for (int j = 0; j < row->render[i].len; j++) {
+            str[pos++] = row->render[i].c[j];
+        }
+    }
+    str[pos] = '\0';
+    
+    return str;
 }
 
+void editorFind() {
+    char *query = editorPrompt("Search: %s (ESC to cancel)", "", 0);
+    if (query == NULL) return;
+    
+    int saved_cursor_x = E.cursor_x;
+    int saved_cursor_y = E.cursor_y;
+    int saved_row_offset = E.row_offset;
+    int saved_col_offset = E.col_offset;
+    
+    // Search from current position forward
+    for (int i = E.cursor_y; i < E.numrows; i++) {
+        erow *row = &E.row[i];
+        
+        // Convert row to byte string for searching
+        char *render_str = row_to_string(row);
+        if (!render_str) continue;
+        
+        char *match = strstr(render_str, query);
+        if (match) {
+            E.cursor_y = i;
+            
+            // Find the character index from byte position
+            int byte_pos = match - render_str;
+            int char_idx = 0;
+            int current_byte = 0;
+            
+            for (char_idx = 0; char_idx < row->rsize; char_idx++) {
+                if (current_byte >= byte_pos) break;
+                current_byte += row->render[char_idx].len;
+            }
+            
+            E.cursor_x = editorRowRxToCx(row, char_idx);
+            E.row_offset = E.numrows; // Force scroll
+            
+            free(render_str);
+            free(query);
+            return;
+        }
+        
+        free(render_str);
+    }
+    
+    // Not found - restore cursor position
+    E.cursor_x = saved_cursor_x;
+    E.cursor_y = saved_cursor_y;
+    E.row_offset = saved_row_offset;
+    E.col_offset = saved_col_offset;
+    
+    editorSetStatusMessage("Not found: %s", query);
+    free(query);
+}

src/init.c

@@ -86,6 +86,6 @@ void initEditor() {
       (int)lisp_eval(lisp_read("QUIT-TIMES", &E.ctx_error, E.ctx), &E.ctx_error,
                      E.ctx)
           .val.int_val;
-
+  fprintf(stderr, "Tab %d\n", E.constantes.QUIT_TIMES);
   E.quit_times_buffer = E.constantes.QUIT_TIMES;
 }

src/input.c

@@ -1,200 +1,147 @@
 #include "../include/input.h"
+#include "../include/define.h"
 #include "../include/editor_op.h"
 #include "../include/output.h"
-#include "../include/define.h"
+#include "include/data.h"
 #include <ctype.h>
-#include <sys/stat.h>
 #include <dirent.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 extern struct editorConfig E;
 
-char * file_completion(const char *path) {
-	DIR * dir;
-	struct dirent *entry;
-	char directory[128];
-	char predict[128];
-	int predict_len = 0;
+char *file_completion(const char *path) {
+  DIR *dir;
+  struct dirent *entry;
+  char directory[128];
+  char predict[128];
+  int predict_len = 0;
 
   if (path[strlen(path) - 1] == '/') {
-    return path;
+    return strdup(path);
   }
 
-	// Find dir name
-	char * last_slash = strrchr(path, '/');
-	if (last_slash) {
-		size_t dir_len = last_slash - path + 1; // length of dir_path
-		strncpy(directory, path, dir_len);
-		predict_len = strlen(path) - dir_len - 1;
-		strncpy(predict, last_slash + 1, predict_len);
-		directory[dir_len] = '\0';
-		predict[predict_len] = '\0';
-		fprintf(stderr, "%s %s\n", directory, predict);
-	} else {
-		return NULL;
-	}
-
+  // Find dir name
+  char *last_slash = strrchr(path, '/');
+  if (last_slash) {
+    size_t dir_len = last_slash - path + 1;
+    strncpy(directory, path, dir_len);
+    predict_len = strlen(path) - dir_len;
+    strncpy(predict, last_slash + 1, predict_len);
+    directory[dir_len] = '\0';
+    predict[predict_len] = '\0';
+  } else {
+    return NULL;
+  }
 
   dir = opendir(directory);
   if (!dir)
-  	return NULL;
-	
-	while ((entry = readdir(dir)) != NULL) {
-        if (strncmp(entry->d_name, predict, predict_len) == 0) {
-            static char full_path[128];
-            snprintf(full_path, sizeof(full_path), "%s%s", directory, entry->d_name);
-
-            struct stat st;
-            if (stat(full_path, &st) == 0 && S_ISDIR(st.st_mode)) {
-                strcat(full_path, "/"); // add slash for directories
-            }
-
-            return strdup(full_path);
-        }
-    }
-
-    // Cleanup when no more entries
-    closedir(dir);
-    dir = NULL;
     return NULL;
 
+  while ((entry = readdir(dir)) != NULL) {
+    if (strncmp(entry->d_name, predict, predict_len) == 0) {
+      static char full_path[128];
+      snprintf(full_path, sizeof(full_path), "%s%s", directory, entry->d_name);
+
+      struct stat st;
+      if (stat(full_path, &st) == 0 && S_ISDIR(st.st_mode)) {
+        strcat(full_path, "/");
+      }
+      closedir(dir);
+      return strdup(full_path);
+    }
+  }
+
+  closedir(dir);
+  return NULL;
 }
 
 /**
  * \fn char * editorPrompt(struct editorConfig *E, char *prompt, char bPathMode)
  * \brief Return user input in a prompt when enter is hit. */
 
-char *editorPrompt(char *prompt, char * placeHolder, char bPathMode) {
+char *editorPrompt(char *prompt, char *placeHolder, char bPathMode) {
   size_t buf_size = 128;
   char *buf = malloc(buf_size);
   size_t buf_len = 0;
-  int c = 0;
   buf[0] = '\0';
-	strcpy(buf, placeHolder);
-	buf_len = strlen(placeHolder);
+  strcpy(buf, placeHolder);
+  buf_len = strlen(placeHolder);
 
   while (1) {
-		editorSetStatusMessage(prompt, buf);
+    editorSetStatusMessage(prompt, buf);
     editorRefreshScreen();
-    c = editorReadKey();
-    if (c == DEL_KEY || c == CTRL_KEY('h') || c == BACKSPACE) {
+    
+    KeyInfo *key = editorReadKey();
+    
+    // Handle backspace/delete
+    if (key->type == KEY_SPECIAL && (key->data.special == 127 || key->data.special == 8)) {
       if (buf_len != 0) {
         buf[--buf_len] = '\0';
       }
-    } else if (c == ESCAPE) {
+    }
+    // Handle Ctrl+H (backspace)
+    else if (key->type == KEY_CTRL && key->data.ctrl_char == 'H') {
+      if (buf_len != 0) {
+        buf[--buf_len] = '\0';
+      }
+    }
+    // Handle ESC
+    else if (key->type == KEY_SPECIAL && key->data.special == 27) {
       editorSetStatusMessage("");
       free(buf);
       return NULL;
-    } else if (c == '\r') {
+    }
+    // Handle Enter
+    else if (key->type == KEY_SPECIAL && (key->data.special == 13 || key->data.special == 10)) {
       if (buf_len != 0) {
         editorSetStatusMessage("");
         return buf;
       }
-    } else if (bPathMode && c == '\t') {
-			char path[128];
-		  char * pwd;
-			if (buf[0] != '/') {
-				pwd = getenv("PWD");
-			  fprintf(stderr, "%s\n", pwd);
-			  memcpy(path, pwd, strlen(pwd));
-				path[strlen(pwd)] = '/';
-				strncat(path, buf, buf_len);
-			} else {
-				strcpy(path, buf);
-			}
-			memset(buf, 0, 128);
-			buf_len = 0;
-		  strcpy(buf, file_completion(path));
-			buf_len = strlen(buf);
-			buf[buf_len] = '\0';
-		  
-    } else if (!iscntrl(c) && c < 128) {
+    }
+    // Handle Tab for path completion
+    else if (bPathMode && key->type == KEY_SPECIAL && key->data.special == 9) {
+      char path[128];
+      char *pwd;
+      if (buf[0] != '/') {
+        pwd = getenv("PWD");
+        snprintf(path, sizeof(path), "%s/%s", pwd, buf);
+      } else {
+        strcpy(path, buf);
+      }
+      
+      char *completion = file_completion(path);
+      if (completion) {
+        memset(buf, 0, buf_size);
+        strcpy(buf, completion);
+        buf_len = strlen(buf);
+        free(completion);
+      }
+    }
+    // Handle regular characters (ASCII only for prompts)
+    else if (key->type == KEY_CHAR && key->data.codepoint < 128) {
       if (buf_len == buf_size - 1) {
         buf_size *= 2;
         buf = realloc(buf, buf_size);
       }
-      buf[buf_len++] = c;
+      buf[buf_len++] = (char)key->data.codepoint;
       buf[buf_len] = '\0';
     }
   }
 }
 
-char *key_to_string(int key) {
-  static char key_str[32];
-
-  char tmp[10];
-  sprintf(tmp, "%d", key);
-
-
-  // First test enter key
-
-  if (key == '\r') {
-    strcpy(key_str, "ENTER");
-  } else if (key >= 1 && key <= 26) { // CTRL keys
-    snprintf(key_str, sizeof(key_str), "CTRL-%c", 'a' + key - 1);
-  } else {
-    switch (key) {
-    case ARROW_UP:
-      strcpy(key_str, "ARROW-UP");
-      break;
-    case ARROW_DOWN:
-      strcpy(key_str, "ARROW-DOWN");
-      break;
-    case ARROW_LEFT:
-      strcpy(key_str, "ARROW-LEFT");
-      break;
-    case ARROW_RIGHT:
-      strcpy(key_str, "ARROW-RIGHT");
-      break;
-    case PAGE_UP:
-      strcpy(key_str, "PAGE-UP");
-      fprintf(stderr, "pagr up\n");
-      break;
-    case PAGE_DOWN:
-      strcpy(key_str, "PAGE-DOWN");
-      break;
-    case DEL_KEY:
-      fprintf(stderr, "delete key\n");
-      strcpy(key_str, "DEL");
-      
-      break;
-    case BACKSPACE:
-      strcpy(key_str, "BACKSPACE");
-      break;
-    case '\r':
-      strcpy(key_str, "ENTER");
-      break;
-    case '\x1b':
-      strcpy(key_str, "ESCAPE");
-      break;
-    case BEG_LINE:
-      strcpy(key_str, "HOME");
-      break;
-    case END_LINE:
-      strcpy(key_str, "END");
-      break;
-    default:
-      // For regular characters
-      if (isprint(key)) {
-        snprintf(key_str, sizeof(key_str), "%c", key);
-      } else {
-        snprintf(key_str, sizeof(key_str), "KEY-%d", key);
-      }
-    }
-  }
-  return key_str;
-}
-
-
-void editorMoveCursor(int key) {
+void editorMoveCursor(KeyInfo *key) {
+  if (key->type != KEY_ARROW) return;
+  
   erow *row = (E.cursor_y >= E.numrows) ? NULL : &E.row[E.cursor_y];
   int row_len;
-  switch (key) {
-  case ARROW_RIGHT:
+  
+  switch (key->data.arrow) {
+  case 'C': // Right
     if (row && E.cursor_x < row->size) {
       ++E.cursor_x;
     } else if (row && E.cursor_x == row->size) {
@@ -202,17 +149,17 @@ void editorMoveCursor(int key) {
       E.cursor_x = 0;
     }
     break;
-  case ARROW_DOWN:
+  case 'B': // Down
     if (E.cursor_y < E.numrows) {
       ++E.cursor_y;
     }
     break;
-  case ARROW_UP:
+  case 'A': // Up
     if (E.cursor_y != 0) {
       --E.cursor_y;
     }
     break;
-  case ARROW_LEFT:
+  case 'D': // Left
     if (E.cursor_x != 0) {
       --E.cursor_x;
     } else if (E.cursor_y > 0) {
@@ -229,28 +176,73 @@ void editorMoveCursor(int key) {
   }
 }
 
-int executeKeyBind(char *key_sequence) {
-  int i;
-  for (i = 0; i < E.number_of_keybinds; ++i) {
-    if (!strcmp(key_sequence, E.key_binds[i].key_sequence)) {
+KeyInfo *stringToCodepoint(const char *string) {
+  KeyInfo *key = (KeyInfo *)malloc(sizeof(KeyInfo));
+  // test control key
+  if (!strncmp("CTRL", string, 4)) {
+    key->type = KEY_CTRL;
+    key->data.ctrl_char = toupper(string[6]) + 64;
+  } else if (!strncmp("ARROW", string, 5)) {
+    key->type = KEY_ARROW;
+    if (!strcmp("UP", string + 7)) {
+      key->data.arrow = 'A';
+    } else if (!strcmp("DOWN", string + 7)) {
+      key->data.arrow = 'B';
+    } else if (!strcmp("RIGHT", string + 7)) {
+      key->data.arrow = 'C';
+    } else if (!strcmp("LEFT", string + 7)) {
+      key->data.arrow = 'D';
+    }
+  }
+
+  return key;
+}
+
+static int key_match(KeyInfo *a, KeyInfo *b) {
+  if (a->type != b->type) return 0;
+  if (a->modifiers != b->modifiers) return 0;
   
-        fprintf(stderr, "lisp function %s\n", key_sequence);
-        // It's a symbol, create a function call
-        lisp_eval(lisp_cons(E.key_binds[i].command, lisp_null(), E.ctx),
-                  &E.ctx_error, E.ctx);
-        return 1;
+  switch (a->type) {
+    case KEY_CTRL:
+      return toupper(a->data.ctrl_char) == toupper(b->data.ctrl_char);
+    case KEY_ALT:
+      return a->data.alt_char == b->data.alt_char;
+    case KEY_ARROW:
+      return a->data.arrow == b->data.arrow;
+    case KEY_FUNCTION:
+      return a->data.function_num == b->data.function_num;
+    case KEY_CHAR:
+      return a->data.codepoint == b->data.codepoint;
+    case KEY_SPECIAL:
+    case KEY_NAVIGATION:
+      return a->data.special == b->data.special;
+    default:
+      return 0;
+  }
+}
+
+int executeKeyBind(KeyInfo *key_sequence) {
+  for (int i = 0; i < E.number_of_keybinds; ++i) {
+    fprintf(stderr, "Keybind found\n");
+    if (key_match(key_sequence, E.key_binds[i].key_sequence)) {
+      // Execute the lisp command
+      lisp_eval(lisp_cons(E.key_binds[i].command, lisp_null(), E.ctx),
+                &E.ctx_error, E.ctx);
+      return 1;
     }
   }
   return 0;
 }
 
 void editorProcessKeypress() {
-  int c = editorReadKey();
+  KeyInfo *key = editorReadKey();
+  if (!key)
+    return;
 
-  if (executeKeyBind(key_to_string(c))) {
+  if (executeKeyBind(key)) {
+    fprintf(stderr, "Keybinds found\n");
     return;
   }
-  editorInsertChar(c);
+  editorInsertChar(&key->c);
   E.quit_times_buffer = E.constantes.QUIT_TIMES;
-
 }

src/output.c

@@ -6,6 +6,17 @@
 
 extern struct editorConfig E;
 
+static void utf8_to_bytes(utf_8_char_t *chars, int count, unsigned char *output, int *output_len) {
+  int pos = 0;
+  for (int i = 0; i < count; i++) {
+    for (int j = 0; j < chars[i].len; j++) {
+      output[pos++] = chars[i].c[j];
+    }
+    fprintf(stderr, "bytes length : %s %d\n", chars[i].c, pos);
+  }
+  *output_len = pos;
+}
+
 void editorDrawRows(struct abuf *ab) {
   int y;
   char welcome[80];
@@ -41,7 +52,16 @@ void editorDrawRows(struct abuf *ab) {
         len = 0;
       if (len > E.screencols)
         len = E.screencols;
-      abAppend(ab, &E.row[file_row].render[E.col_offset], len);
+      if (len > 0) {
+        unsigned char *display_buf = malloc(len * 4); // Max 4 bytes per char
+        int byte_len;
+
+        utf8_to_bytes(&E.row[file_row].render[E.col_offset], len, display_buf,
+                      &byte_len);
+        abAppend(ab, display_buf, byte_len);
+        fprintf(stderr, "display buffer : %s %d\n", display_buf, byte_len);
+        free(display_buf);
+      }
     }
     abAppend(ab, ERASE_END_LINE, 3);
     abAppend(ab, "\r\n", 2);

src/row_op.c

@@ -1,4 +1,6 @@
 #include "../include/row_op.h"
+#include "include/data.h"
+#include "include/define.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -6,11 +8,29 @@
 
 extern struct editorConfig E;
 
+static int is_tab(utf_8_char_t *ch) {
+  return ch->len == 1 && ch->c[0] == '\t';
+}
+
+// Helper function to check if two utf_8_char_t are equal
+static int utf8_char_equal(utf_8_char_t *a, utf_8_char_t *b) {
+  if (a->len != b->len) return 0;
+  return memcmp(a->c, b->c, a->len) == 0;
+}
+
+// Helper function to create a space character
+static utf_8_char_t make_space() {
+  utf_8_char_t space;
+  space.c[0] = ' ';
+  space.len = 1;
+  return space;
+}
+
 int editorRowCxToRx(erow *row, int cursor_x) {
   int render_x = 0;
   int i;
   for (i = 0; i < cursor_x; ++i) {
-    if (row->chars[i] == '\t') {
+    if (is_tab(&row->chars[i])) {
       render_x += (E.constantes.TAB_LENGTH - 1) - (render_x % E.constantes.TAB_LENGTH);
     }
     render_x++;
@@ -22,7 +42,7 @@ int editorRowRxToCx(erow *row, int rx) {
   int cur_rx = 0;
   int cx;
   for (cx = 0; cx < row->size; cx++) {
-    if (row->chars[cx] == '\t')
+    if (is_tab(&row->chars[cx]))
       cur_rx += (E.constantes.TAB_LENGTH - 1) - (cur_rx % E.constantes.TAB_LENGTH);
     cur_rx++;
     if (cur_rx > rx) return cx;
@@ -39,40 +59,42 @@ void editorUpdateRow(erow *row) {
   int i, i_render;
   int tabs = 0;
 
-  // counting number of tabs
-
+  // Count number of tabs
   for (i = 0; i < row->size; ++i) {
-    tabs +=
-        (row->chars[i] == '\t'); /**< increment tabs of 1 if chars[i] is one. */
+    if (is_tab(&row->chars[i])) {
+      tabs++;
+    }
   }
 
   free(row->render);
-  row->render = malloc(row->size + tabs * (E.constantes.TAB_LENGTH - 1) +
-                       1); /**< Tabs needs E.constantes.TAB_LENGTH chars so E.constantes.TAB_LENGTH - 1
-                              more than the first already counted. */
+  // Allocate space for utf_8_char_t array
+  row->render = malloc(sizeof(utf_8_char_t) * (row->size + tabs * (E.constantes.TAB_LENGTH - 1)));
+  
+  if (!row->render) {
+    row->rsize = 0;
+    return;
+  }
 
-  // end of counting
   i_render = 0;
   for (i = 0; i < row->size; ++i) {
-    if (row->chars[i] == '\t') {
-      row->render[i_render++] = ' ';
+    if (is_tab(&row->chars[i])) {
+      // Replace tab with spaces
+      row->render[i_render++] = make_space();
       while (i_render % E.constantes.TAB_LENGTH) {
-        row->render[i_render++] =
-            ' '; /**< Addind the right amount of spaces for tabs */
+        row->render[i_render++] = make_space();
       }
     } else {
       row->render[i_render++] = row->chars[i];
     }
   }
-  row->render[i_render] = '\0'; // Don't forget the end of string character.
   row->rsize = i_render;
 }
 
 void editorInsertRow(int at, char *s, size_t len) {
   if (at < 0 || at > E.numrows) {
-    
     return;
   }
+  
   erow *tmp = (erow *)realloc(E.row, sizeof(erow) * (E.numrows + 1));
   if (!tmp) {
     return;
@@ -80,19 +102,78 @@ void editorInsertRow(int at, char *s, size_t len) {
   E.row = tmp;
   memmove(&E.row[at + 1], &E.row[at], sizeof(erow) * (E.numrows - at));
 
-  E.row[at].size = len;
-  E.row[at].chars = malloc(len + 1);
-  memcpy(E.row[at].chars, s, len);
-  E.row[at].chars[len] = '\0';
-
+  // Initialize the new row
+  E.row[at].size = 0;
+  E.row[at].chars = NULL;
   E.row[at].rsize = 0;
   E.row[at].render = NULL;
+
+  // Count UTF-8 characters first
+  int char_count = 0;
+  int i = 0;
+  while (i < len) {
+    unsigned char first = (unsigned char)s[i];
+    int char_len;
+    
+    if ((first & 0x80) == 0) {
+      char_len = 1;
+    } else if ((first & 0xE0) == 0xC0) {
+      char_len = 2;
+    } else if ((first & 0xF0) == 0xE0) {
+      char_len = 3;
+    } else if ((first & 0xF8) == 0xF0) {
+      char_len = 4;
+    } else {
+      char_len = 1; // Invalid, treat as single byte
+    }
+    
+    i += char_len;
+    char_count++;
+  }
+
+  // Allocate for the actual number of characters
+  if (char_count > 0) {
+    E.row[at].chars = malloc(sizeof(utf_8_char_t) * char_count);
+    if (!E.row[at].chars) {
+      return;
+    }
+  }
+  
+  // Now convert to utf_8_char_t array
+  i = 0;
+  E.row[at].size = 0;
+  while (i < len && E.row[at].size < char_count) {
+    utf_8_char_t ch;
+    
+    unsigned char first = (unsigned char)s[i];
+    if ((first & 0x80) == 0) {
+      ch.len = 1;
+    } else if ((first & 0xE0) == 0xC0) {
+      ch.len = 2;
+    } else if ((first & 0xF0) == 0xE0) {
+      ch.len = 3;
+    } else if ((first & 0xF8) == 0xF0) {
+      ch.len = 4;
+    } else {
+      ch.len = 1;
+    }
+    
+    // Copy bytes
+    for (int j = 0; j < ch.len && i < len; j++) {
+      ch.c[j] = s[i++];
+    }
+    
+    E.row[at].chars[E.row[at].size++] = ch;
+  }
+
   editorUpdateRow(&E.row[at]);
 
+  
   ++E.numrows;
   ++E.dirty;
 }
 
+
 void editorFreeRow(erow *row) {
   free(row->render);
   free(row->chars);
@@ -112,16 +193,17 @@ void editorDelRow(int at) {
  * \fn editorRowInsertChar(erow *row, int at, int c)
  * \param at Index of where we want to insert the char */
 
-void editorRowInsertChar(erow *row, int at, int c) {
+void editorRowInsertChar(erow *row, int at, utf_8_char_t c) {
   if (E.state == READ_ONLY)
     return;
   if (at < 0 || at > row->size) {
     at = row->size;
   }
-  row->chars = realloc(row->chars, row->size + 2);
+  row->chars = realloc(row->chars, row->size + 1);
   memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
-  ++row->size;
+  ++(row->size);
   row->chars[at] = c;
+  fprintf(stderr, "Row insert : %s %d\n", c.c, c.len);
   editorUpdateRow(row);
   ++E.dirty;
 }
@@ -130,7 +212,6 @@ void editorRowAppendString(erow *row, char *s, size_t len) {
   row->chars = realloc(row->chars, row->size + len + 1);
   memcpy(&row->chars[row->size], s, len);
   row->size += len;
-  row->chars[row->size] = '\0';
   editorUpdateRow(row);
   ++E.dirty;
 }

src/terminal.c

@@ -2,6 +2,8 @@
 #include "../include/data.h"
 
 #include <stdio.h>
+#include <unistd.h>
+#include <string.h>
 
 void die(const char *s) {
   write(STDOUT_FILENO, "\x1b[2J", 4);
@@ -35,73 +37,211 @@ void enableRawMode() {
   }
 }
 
-int editorReadKey() {
-  int nread;
-  char c;
-  char seq[3];
-  while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
-    if (nread == -1 && errno != EAGAIN) {
-      die("read");
+int utf8_char_length(unsigned char first_byte) {
+  if ((first_byte & 0x80) == 0)
+    return 1; // 0xxxxxxx - ASCII
+  if ((first_byte & 0xE0) == 0xC0)
+    return 2; // 110xxxxx - 2 bytes
+  if ((first_byte & 0xF0) == 0xE0)
+    return 3; // 1110xxxx - 3 bytes
+  if ((first_byte & 0xF8) == 0xF0)
+    return 4; // 11110xxx - 4 bytes
+  return 1;   // Invalid, treat as single byte
+}
+
+// Convert UTF-8 to Unicode code point
+unsigned int utf8_to_codepoint(const unsigned char *bytes, int len) {
+  if (len == 1)
+    return bytes[0];
+  if (len == 2)
+    return ((bytes[0] & 0x1F) << 6) | (bytes[1] & 0x3F);
+  if (len == 3)
+    return ((bytes[0] & 0x0F) << 12) | ((bytes[1] & 0x3F) << 6) |
+           (bytes[2] & 0x3F);
+  if (len == 4)
+    return ((bytes[0] & 0x07) << 18) | ((bytes[1] & 0x3F) << 12) |
+           ((bytes[2] & 0x3F) << 6) | (bytes[3] & 0x3F);
+  return 0;
+}
+
+void parse_key(unsigned char *seq, int len, KeyInfo *key) {
+  memcpy(key->c.c, seq, len);
+  key->c.len = len;
+  key->modifiers = MOD_NONE;
+  key->type = KEY_UNKNOWN;
+
+  // Control characters (Ctrl+A to Ctrl+Z)
+  if (len == 1 && seq[0] < 32 && seq[0] != 27 && seq[0] != 9 && seq[0] != 10 &&
+      seq[0] != 13) {
+    key->type = KEY_CTRL;
+    key->data.ctrl_char = seq[0] + 64;
+    return;
+  }
+
+  // Special single characters
+  if (len == 1) {
+    switch (seq[0]) {
+    case 9:
+    case 10:
+    case 13:
+    case 27:
+    case 127:
+      key->type = KEY_SPECIAL;
+      key->data.special = seq[0];
+      return;
     }
   }
 
-  if (c == '\x1b') {
-    if (read(STDIN_FILENO, &seq[0], 1) != 1 ||
-        read(STDIN_FILENO, &seq[1], 1) != 1) {
-      return '\x1b';
+  // Escape sequences
+  if (len >= 2 && seq[0] == 27) {
+    // Alt+key combinations
+    if (len == 2 && seq[1] >= 32 && seq[1] < 127) {
+      key->type = KEY_ALT;
+      key->data.alt_char = seq[1];
+      return;
     }
-    if (seq[0] == '[') {
-      if (seq[1] >= '0' && seq[1] <= '9') {
-        if (read(STDIN_FILENO, &seq[2], 1) != 1) {
-          return '\x1b';
+
+    // CSI sequences (ESC [ ...)
+    if (len >= 3 && seq[1] == '[') {
+      // Arrow keys
+      if (len == 3) {
+        switch (seq[2]) {
+        case 'A':
+        case 'B':
+        case 'C':
+        case 'D':
+          key->type = KEY_ARROW;
+          key->data.arrow = seq[2];
+          return;
+        case 'H':
+        case 'F':
+          key->type = KEY_NAVIGATION;
+          key->data.special = seq[2];
+          return;
         }
-        if (seq[2] == '~') {
-          switch (seq[1]) {
-          case '1':
-            return BEG_LINE;
-          case '3':
-            return DEL_KEY;
-          case '4':
-            return END_LINE;
-          case '5':
-            return PAGE_UP;
-          case '6':
-            return PAGE_DOWN;
-          case '7':
-            return BEG_LINE;
-          case '8':
-            return END_LINE;
+      }
+
+      // Modified keys (ESC [ 1 ; modifier letter)
+      if (len >= 6 && seq[2] == '1' && seq[3] == ';') {
+        int modifier = seq[4] - '0';
+        char k = seq[5];
+
+        if (modifier & 1)
+          key->modifiers |= MOD_SHIFT;
+        if (modifier & 2)
+          key->modifiers |= MOD_ALT;
+        if (modifier & 4)
+          key->modifiers |= MOD_CTRL;
+
+        switch (k) {
+        case 'A':
+        case 'B':
+        case 'C':
+        case 'D':
+          key->type = KEY_ARROW;
+          key->data.arrow = k;
+          return;
+        case 'H':
+        case 'F':
+          key->type = KEY_NAVIGATION;
+          key->data.special = k;
+          return;
+        }
+      }
+
+      // Function keys and navigation
+      if (len == 4 && seq[3] == '~') {
+        int num = seq[2] - '0';
+        if (num >= 1 && num <= 6) {
+          key->type = KEY_NAVIGATION;
+          key->data.special = seq[2];
+          return;
+        }
+      }
+
+      if (len == 5 && seq[4] == '~') {
+        int num = (seq[2] - '0') * 10 + (seq[3] - '0');
+        if (num >= 15 && num <= 24) {
+          key->type = KEY_FUNCTION;
+          // Map to F5-F12
+          int f_map[] = {15, 17, 18, 19, 20, 21, 23, 24};
+          for (int i = 0; i < 8; i++) {
+            if (f_map[i] == num) {
+              key->data.function_num = i + 5;
+              return;
+            }
           }
         }
-      } else {
-
-        switch (seq[1]) {
-        case 'A':
-          return ARROW_UP;
-        case 'B':
-          return ARROW_DOWN;
-        case 'C':
-          return ARROW_RIGHT;
-        case 'D':
-          return ARROW_LEFT;
-        case 'H':
-          return BEG_LINE;
-        case 'F':
-          return END_LINE;
-        }
-      }
-    } else if (seq[0] == 'O') {
-      switch (seq[1]) {
-      case 'H':
-        return BEG_LINE;
-      case 'F':
-        return END_LINE;
       }
     }
-    return '\x1b';
-  } else {
-    return c;
+
+    // SS3 sequences (ESC O ...)
+    if (len == 3 && seq[1] == 'O') {
+      switch (seq[2]) {
+      case 'P':
+      case 'Q':
+      case 'R':
+      case 'S':
+        key->type = KEY_FUNCTION;
+        key->data.function_num = seq[2] - 'P' + 1;
+        return;
+      case 'H':
+      case 'F':
+        key->type = KEY_NAVIGATION;
+        key->data.special = seq[2];
+        return;
+      }
+    }
   }
+
+  // UTF-8 character
+  if (seq[0] >= 32 || (seq[0] & 0x80)) {
+    int char_len = utf8_char_length(seq[0]);
+    fprintf(stderr, "char length : %d\n", char_len);
+    if (char_len <= len) {
+      key->type = KEY_CHAR;
+      memcpy(key->c.c, seq, len);
+      key->c.len = len;
+      return;
+    }
+  }
+}
+
+KeyInfo *editorReadKey() {
+  fd_set fds;
+  int timeout_ms = 10;
+  struct timeval tv;
+  int total = 0;
+  KeyInfo *key = (KeyInfo *)malloc(sizeof(KeyInfo));
+  int len;
+  unsigned char buffer[20];
+
+  if (read(STDIN_FILENO, &buffer[0], 1) <= 0)
+    return 0;
+
+  while (total < 20) {
+    FD_ZERO(&fds);
+    FD_SET(STDIN_FILENO, &fds);
+    tv.tv_sec = 0;
+    tv.tv_usec = timeout_ms * 1000;
+
+    int ret = select(STDIN_FILENO + 1, &fds, NULL, NULL, &tv);
+    if (ret <= 0)
+      break;
+
+    if (read(STDIN_FILENO, &buffer[total], 1) <= 0)
+      break;
+    total++;
+  }
+  total++;
+
+  parse_key(buffer, total, key);
+
+  // DEBUG
+
+  fprintf(stderr, "%s %d %d %s %d\n", buffer, buffer[0], buffer[1], key->c.c, key->c.len);
+  
+  return key;
 }
 
 int getCursorPosition(int *rows, int *cols) {