From f03f084d72b56c465d5272bbf7950b3c1ca9dad2 Mon Sep 17 00:00:00 2001
From: Tyrel Souza <923113+tyrelsouza@users.noreply.github.com>
Date: Sat, 23 Oct 2021 00:09:01 -0400
Subject: [PATCH] syntax

---
 tted.c | 1194 ++++++++++++++++++++++++++++++--------------------------
 1 file changed, 644 insertions(+), 550 deletions(-)

diff --git a/tted.c b/tted.c
index ff1c32c..45b3fea 100644
--- a/tted.c
+++ b/tted.c
@@ -19,45 +19,60 @@
 /** defines */
 #define TTED_VERSION "0.0.1"
 #define TTED_TAB_STOP 8
-#define TTED_QUIT_TIMES 3
+#define TTED_QUIT_TIMES 1
 #define CTRL_KEY(k) ((k) & 0x1f)
 
 enum editorKey {
-    BACKSPACE = 127,
-    ARROW_LEFT = 1000,
-    ARROW_RIGHT,
-    ARROW_UP,
-    ARROW_DOWN,
-    DEL_KEY,
-    HOME_KEY,
-    END_KEY,
-    PAGE_UP,
-    PAGE_DOWN
+  BACKSPACE = 127,
+  ARROW_LEFT = 1000,
+  ARROW_RIGHT,
+  ARROW_UP,
+  ARROW_DOWN,
+  DEL_KEY,
+  HOME_KEY,
+  END_KEY,
+  PAGE_UP,
+  PAGE_DOWN
 };
 
+enum editorHighlight {
+  HL_NORMAL = 0,
+  HL_NUMBER,
+  HL_MATCH
+};
+
+#define HL_HIGHLIGHT_NUMBERS (1<<0)
+
 
 /** data */
+struct editorSyntax {
+  char *filetype;
+  char **filematch;
+  int flags;
+};
+
 typedef struct erow {
-    int size;
-    int rsize;
-    char *chars;
-    char *render;
+  int size;
+  int rsize;
+  char *chars;
+  char *render;
+  unsigned char *hl;
 } erow;
 
 struct editorConfig {
-    int cx, cy;
-    int rx;
-    int rowoff;
-    int coloff;
-    int screenrows;
-    int screencols;
-    int numrows;
-    erow *row;
-    int dirty;
-    char *filename;
-    char statusmsg[80];
-    time_t statusmsg_time;
-    struct termios orig_termios;
+  int cx, cy;
+  int rx;
+  int rowoff;
+  int coloff;
+  int screenrows;
+  int screencols;
+  int numrows;
+  erow *row;
+  int dirty;
+  char *filename;
+  char statusmsg[80];
+  time_t statusmsg_time;
+  struct termios orig_termios;
 };
 struct editorConfig E;
 
@@ -68,343 +83,386 @@ char *editorPrompt(char *prompt, void (*callback)(char *, int));
 
 /** terminal */
 void die(const char *s) {
-    write(STDOUT_FILENO, "\x1b[2J", 4);
-    write(STDOUT_FILENO, "\x1b[H", 3);
+  write(STDOUT_FILENO, "\x1b[2J", 4);
+  write(STDOUT_FILENO, "\x1b[H", 3);
 
-    perror(s);
-    exit(1);
+  perror(s);
+  exit(1);
 }
 
 void disableRawMode() {
-    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1) {
-        die("tcsetattr");
-    }
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1) {
+    die("tcsetattr");
+  }
 }
 
 void enableRawMode() {
-    if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr");
+  if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr");
 
-    atexit(disableRawMode);
+  atexit(disableRawMode);
 
-    struct termios raw = E.orig_termios;
-    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
-    raw.c_oflag &= ~(OPOST);
-    raw.c_cflag |= (CS8);
-    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
-    raw.c_cc[VMIN] = 0;
-    raw.c_cc[VTIME] = 1;
-    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
+  struct termios raw = E.orig_termios;
+  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+  raw.c_oflag &= ~(OPOST);
+  raw.c_cflag |= (CS8);
+  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+  raw.c_cc[VMIN] = 0;
+  raw.c_cc[VTIME] = 1;
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
 }
 
 int editorReadKey() {
-    int nread;
-    char c;
-    while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
-        if (nread == -1 && errno != EAGAIN) die("read");
-    }
+  int nread;
+  char c;
+  while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
+    if (nread == -1 && errno != EAGAIN) die("read");
+  }
 
-    if (c == '\x1b') {
-        char seq[3];
-        if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
-        if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
-        if (seq[0] == '[') {
-            if (seq[1] >= '0' && seq[1] <= '9') {
-                if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
-                if (seq[2] == '~') {
-                    switch (seq[1]) {
-                        case '1':
-                            return HOME_KEY;
-                        case '3':
-                            return DEL_KEY;
-                        case '4':
-                            return END_KEY;
-                        case '5':
-                            return PAGE_UP;
-                        case '6':
-                            return PAGE_DOWN;
-                        case '7':
-                            return HOME_KEY;
-                        case '8':
-                            return END_KEY;
-                    }
-                }
-            } 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 HOME_KEY;
-                    case 'F':
-                        return END_KEY;
-                }
-            }
-        } else if (seq[0] == 'O') {
-            switch (seq[1]) {
-                case 'H':
-                    return HOME_KEY;
-                case 'F':
-                    return END_KEY;
-            }
+  if (c == '\x1b') {
+    char seq[3];
+    if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
+    if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
+    if (seq[0] == '[') {
+      if (seq[1] >= '0' && seq[1] <= '9') {
+        if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
+        if (seq[2] == '~') {
+          switch (seq[1]) {
+            case '1':
+              return HOME_KEY;
+            case '3':
+              return DEL_KEY;
+            case '4':
+              return END_KEY;
+            case '5':
+              return PAGE_UP;
+            case '6':
+              return PAGE_DOWN;
+            case '7':
+              return HOME_KEY;
+            case '8':
+              return END_KEY;
+          }
         }
-        return '\x1b';
-    } else {
-        return c;
+      } 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 HOME_KEY;
+          case 'F':
+            return END_KEY;
+        }
+      }
+    } else if (seq[0] == 'O') {
+      switch (seq[1]) {
+        case 'H':
+          return HOME_KEY;
+        case 'F':
+          return END_KEY;
+      }
     }
+    return '\x1b';
+  } else {
+    return c;
+  }
 }
 
 int getCursorPosition(int *rows, int *cols) {
-    char buf[32];
-    unsigned int i = 0;
-    if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) return -1;
+  char buf[32];
+  unsigned int i = 0;
+  if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) return -1;
 
-    while (i < sizeof(buf) - 1) {
-        if (read(STDIN_FILENO, &buf[i], 1) != 1) break;
-        if (buf[i] == 'R') break;
-        i++;
-    }
-    buf[i] = '\0'; //assign null to final byte
-    if (buf[0] != '\x1b' || buf[1] != '[') return -1;
-    if (sscanf(&buf[2], "%d;%d", rows, cols) != 2) return -1;
-    return 0;
+  while (i < sizeof(buf) - 1) {
+    if (read(STDIN_FILENO, &buf[i], 1) != 1) break;
+    if (buf[i] == 'R') break;
+    i++;
+  }
+  buf[i] = '\0'; //assign null to final byte
+  if (buf[0] != '\x1b' || buf[1] != '[') return -1;
+  if (sscanf(&buf[2], "%d;%d", rows, cols) != 2) return -1;
+  return 0;
 }
 
 int getWindowSize(int *rows, int *cols) {
-    struct winsize ws;
-    if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
-        if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) return -1;
-        return getCursorPosition(rows, cols);
-    } else {
-        *cols = ws.ws_col;
-        *rows = ws.ws_row;
-        return 0;
+  struct winsize ws;
+  if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
+    if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) return -1;
+    return getCursorPosition(rows, cols);
+  } else {
+    *cols = ws.ws_col;
+    *rows = ws.ws_row;
+    return 0;
+  }
+}
+
+/** syntax highlighting */
+
+int is_separator(int c){
+  return isspace(c) || c == '\0' || strchr(",.()+-/*=~%<>[];\"", c) != NULL;
+
+}
+
+void editorUpdateSyntax(erow *row){
+  row->hl = realloc(row->hl, row->rsize);
+  memset(row->hl, HL_NORMAL, row->rsize);
+
+  int prev_sep = 1;
+
+  int i = 0;
+  while(i < row->rsize){
+    char c = row->render[i];
+    unsigned char prev_hl = (i>0) ? row->hl[i-1] : HL_NORMAL;
+
+    if ((isdigit(c) && (prev_sep || prev_hl == HL_NUMBER))||
+        (c == '.' && prev_hl == HL_NUMBER)){
+      row->hl[i] = HL_NUMBER;
+      i++;
+      prev_sep = 0;
+      continue;
     }
+
+    prev_sep = is_separator(c);
+    i++;
+  }
+}
+
+int editorSyntaxToColor(int hl){
+  switch(hl){
+    case HL_NUMBER: return 31;
+    case HL_MATCH: return 34;
+    default: return 37;
+  }
 }
 
 /** row operations */
 int editorRowCxToRx(erow *row, int cx) {
-    int rx = 0;
-    int j;
-    for (j = 0; j < cx; j++) {
-        if (row->chars[j] == '\t') {
-            rx += (TTED_TAB_STOP - 1) - (rx % TTED_TAB_STOP);
-        }
-        rx++;
+  int rx = 0;
+  int j;
+  for (j = 0; j < cx; j++) {
+    if (row->chars[j] == '\t') {
+      rx += (TTED_TAB_STOP - 1) - (rx % TTED_TAB_STOP);
     }
-    return rx;
+    rx++;
+  }
+  return rx;
 }
 int editorRowRxToCx(erow *row, int rx) {
-    int cur_rx = 0;
-    int cx;
-    for (cx = 0; cx < row->size; cx++) {
-      if(row->chars[cx] == '\t'){
-        cur_rx += (TTED_TAB_STOP - 1) - (cur_rx % TTED_TAB_STOP);
-      }
-      cur_rx++;
-
-      if (cur_rx > rx) return cx;
+  int cur_rx = 0;
+  int cx;
+  for (cx = 0; cx < row->size; cx++) {
+    if(row->chars[cx] == '\t'){
+    cur_rx += (TTED_TAB_STOP - 1) - (cur_rx % TTED_TAB_STOP);
     }
-    return cx;
+    cur_rx++;
+
+    if (cur_rx > rx) return cx;
+  }
+  return cx;
 }
 
 void editorUpdateRow(erow *row) {
-    int tabs = 0;
-    int j;
-    for (j = 0; j < row->size; j++) {
-        if (row->chars[j] == '\t') {
-            tabs++;
-        }
+  int tabs = 0;
+  int j;
+  for (j = 0; j < row->size; j++) {
+    if (row->chars[j] == '\t') {
+      tabs++;
     }
+  }
 
-    free(row->render);
-    row->render = malloc(row->size + tabs * (TTED_TAB_STOP - 1) + 1);
+  free(row->render);
+  row->render = malloc(row->size + tabs * (TTED_TAB_STOP - 1) + 1);
 
-    int idx = 0;
-    for (j = 0; j < row->size; j++) {
-        if (row->chars[j] == '\t') {
-            row->render[idx++] = ' ';
-            while (idx % TTED_TAB_STOP != 0) row->render[idx++] = ' ';
-        } else {
-            row->render[idx++] = row->chars[j];
-        }
+  int idx = 0;
+  for (j = 0; j < row->size; j++) {
+    if (row->chars[j] == '\t') {
+      row->render[idx++] = ' ';
+      while (idx % TTED_TAB_STOP != 0) row->render[idx++] = ' ';
+    } else {
+      row->render[idx++] = row->chars[j];
     }
-    row->render[idx] = '\0';
-    row->rsize = idx;
+  }
+  row->render[idx] = '\0';
+  row->rsize = idx;
+
+  editorUpdateSyntax(row);
 }
 
 
 void editorInsertRow(int at, char *s, size_t len) {
-    if (at < 0 || at > E.numrows) return;
-    E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
-    memmove(&E.row[at +1], &E.row[at], sizeof(erow) * (E.numrows-at));
+  if (at < 0 || at > E.numrows) return;
+  E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
+  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';
-    E.row[at].rsize = 0;
-    E.row[at].render = NULL;
-    editorUpdateRow(&E.row[at]);
-    E.numrows++;
-    E.dirty++;
+  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';
+  E.row[at].rsize = 0;
+  E.row[at].render = NULL;
+  E.row[at].hl = NULL;
+  editorUpdateRow(&E.row[at]);
+  E.numrows++;
+  E.dirty++;
 }
 
 void editorFreeRow(erow *row) {
-    free(row->render);
-    free(row->chars);
+  free(row->render);
+  free(row->chars);
+  free(row->hl);
 }
 
 void editorDelRow(int at) {
-    if (at < 0 || at >= E.numrows) return;
+  if (at < 0 || at >= E.numrows) return;
 
-    editorFreeRow(&E.row[at]);
-    memmove(&E.row[at], &E.row[at + 1], sizeof(erow) * (E.numrows - at - 1));
-    E.numrows--;
-    E.dirty++;
+  editorFreeRow(&E.row[at]);
+  memmove(&E.row[at], &E.row[at + 1], sizeof(erow) * (E.numrows - at - 1));
+  E.numrows--;
+  E.dirty++;
 }
 
 void editorRowInsertChar(erow *row, int at, int c) {
-    if (at < 0 || at > row->size) at = row->size;
-    row->chars = realloc(row->chars, row->size + 2);
-    memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
-    row->size++;
-    row->chars[at] = c;
-    editorUpdateRow(row);
-    E.dirty++;
+  if (at < 0 || at > row->size) at = row->size;
+  row->chars = realloc(row->chars, row->size + 2);
+  memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
+  row->size++;
+  row->chars[at] = c;
+  editorUpdateRow(row);
+  E.dirty++;
 }
 
 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++;
+  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++;
 }
 
 void editorRowDelChar(erow *row, int at) {
-    if (at < 0 || at >= row->size) return;
-    memmove(&row->chars[at], &row->chars[at + 1], row->size - at);
-    row->size--;
-    editorUpdateRow(row);
-    E.dirty++;
+  if (at < 0 || at >= row->size) return;
+  memmove(&row->chars[at], &row->chars[at + 1], row->size - at);
+  row->size--;
+  editorUpdateRow(row);
+  E.dirty++;
 }
 
 /** Editor Operatons */
 void editorInsertChar(int c) {
-    if (E.cy == E.numrows) {
-        editorInsertRow(E.numrows, "", 0);
-    }
-    editorRowInsertChar(&E.row[E.cy], E.cx, c);
-    E.cx++;
+  if (E.cy == E.numrows) {
+    editorInsertRow(E.numrows, "", 0);
+  }
+  editorRowInsertChar(&E.row[E.cy], E.cx, c);
+  E.cx++;
 }
 
 void editorInsertNewLine() {
-    if (E.cx == 0) {
-        editorInsertRow(E.cy, "", 0);
-    } else {
-        erow *row = &E.row[E.cy];
-        editorInsertRow(E.cy+1, &row->chars[E.cx], row->size - E.cx);
-        row = &E.row[E.cy];
-        row->size = E.cx;
-        row->chars[row->size] = '\0';
-        editorUpdateRow(row);
-    }
-    E.cy++;
-    E.cx=0;
+  if (E.cx == 0) {
+    editorInsertRow(E.cy, "", 0);
+  } else {
+    erow *row = &E.row[E.cy];
+    editorInsertRow(E.cy+1, &row->chars[E.cx], row->size - E.cx);
+    row = &E.row[E.cy];
+    row->size = E.cx;
+    row->chars[row->size] = '\0';
+    editorUpdateRow(row);
+  }
+  E.cy++;
+  E.cx=0;
 }
 
 void editorDelChar() {
-    if (E.cy == E.numrows) return;
-    if (E.cx == 0 && E.cy == 0) return;
+  if (E.cy == E.numrows) return;
+  if (E.cx == 0 && E.cy == 0) return;
 
-    erow *row = &E.row[E.cy];
-    if (E.cx > 0) {
-        editorRowDelChar(row, E.cx - 1);
-        E.cx--;
-    } else {
-        E.cx = E.row[E.cy - 1].size;
-        editorRowAppendString(&E.row[E.cy - 1], row->chars, row->size);
-        editorDelRow(E.cy);
-        E.cy--;
-    }
+  erow *row = &E.row[E.cy];
+  if (E.cx > 0) {
+    editorRowDelChar(row, E.cx - 1);
+    E.cx--;
+  } else {
+    E.cx = E.row[E.cy - 1].size;
+    editorRowAppendString(&E.row[E.cy - 1], row->chars, row->size);
+    editorDelRow(E.cy);
+    E.cy--;
+  }
 }
 
 /** file i/o */
 
 char *editorRowsToString(int *buflen) {
-    int totlen = 0;
-    int j;
-    for (j = 0; j < E.numrows; j++) {
-        totlen += E.row[j].size + 1;
-    }
-    *buflen = totlen;
+  int totlen = 0;
+  int j;
+  for (j = 0; j < E.numrows; j++) {
+    totlen += E.row[j].size + 1;
+  }
+  *buflen = totlen;
 
-    char *buf = malloc(totlen);
-    char *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++;
-    }
+  char *buf = malloc(totlen);
+  char *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++;
+  }
 
-    return buf;
+  return buf;
 }
 
 
 void editorOpen(char *filename) {
-    free(E.filename);
-    E.filename = strdup(filename);
-    FILE *fp = fopen(filename, "r");
-    if (!fp) die("fopen");
+  free(E.filename);
+  E.filename = strdup(filename);
+  FILE *fp = fopen(filename, "r");
+  if (!fp) die("fopen");
 
-    char *line = NULL;
-    size_t linecap = 0;
-    ssize_t linelen;
-    while ((linelen = getline(&line, &linecap, fp)) != -1) {
-        while (linelen > 0 && (line[linelen - 1] == '\n' ||
-                               line[linelen - 1] == '\r'))
-            linelen--;
-        editorInsertRow(E.numrows, line, linelen);
-    }
-    free(line);
-    fclose(fp);
-    E.dirty = 0;
+  char *line = NULL;
+  size_t linecap = 0;
+  ssize_t linelen;
+  while ((linelen = getline(&line, &linecap, fp)) != -1) {
+    while (linelen > 0 && (line[linelen - 1] == '\n' ||
+                 line[linelen - 1] == '\r'))
+      linelen--;
+    editorInsertRow(E.numrows, line, linelen);
+  }
+  free(line);
+  fclose(fp);
+  E.dirty = 0;
 
 }
 
 void editorSave() {
+  if (E.filename == NULL) {
+    E.filename = editorPrompt("Save as: %s (ESC to cancel)", NULL);
     if (E.filename == NULL) {
-      E.filename = editorPrompt("Save as: %s (ESC to cancel)", NULL);
-      if (E.filename == NULL) {
-        editorSetStatusMessage("Save aborted");
+    editorSetStatusMessage("Save aborted");
+    return;
+    }
+  }
+
+  int len;
+  char *buf = editorRowsToString(&len);
+
+  int fd = open(E.filename, O_RDWR | O_CREAT, 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;
       }
     }
-
-    int len;
-    char *buf = editorRowsToString(&len);
-
-    int fd = open(E.filename, O_RDWR | O_CREAT, 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;
-            }
-        }
-        close(fd);
-    }
-    free(buf);
+    close(fd);
+  }
+  free(buf);
 }
 /** find */
 
@@ -412,17 +470,26 @@ void editorFindCallback(char *query, int key) {
   static int last_match = -1;
   static int direction = 1;
 
+  static int saved_hl_line;
+  static char *saved_hl = NULL;
+
+  if (saved_hl) {
+    memcpy(E.row[saved_hl_line].hl, saved_hl, E.row[saved_hl_line].rsize);
+    free(saved_hl);
+    saved_hl = NULL;
+  }
+
   if (key== '\r' || key == '\x1b') {
-      last_match = -1;
-      direction = 1;
-      return;
+    last_match = -1;
+    direction = 1;
+    return;
   } else if (key == ARROW_RIGHT || key == ARROW_DOWN){
-      direction = 1;
+    direction = 1;
   } else if (key == ARROW_LEFT || key == ARROW_UP){
-      direction = -1;
+    direction = -1;
   } else {
-      last_match = -1;
-      direction = 0;
+    last_match = -1;
+    direction = 0;
   }
 
 
@@ -432,22 +499,27 @@ void editorFindCallback(char *query, int key) {
 
   int i;
   for (i=0; i < E.numrows; i++){
-    current += direction;
-    if (current == -1) { 
-        current = E.numrows -1;
-    } else if (current == E.numrows){
-        current = 0;
-    }
+  current += direction;
+  if (current == -1) { 
+    current = E.numrows -1;
+  } else if (current == E.numrows){
+    current = 0;
+  }
 
-    erow *row = &E.row[current];
-    char *match = strstr(row->render, query);
-    if(match){
-      last_match = current;
-      E.cy = current;
-      E.cx = editorRowCxToRx(row, match - row->render);
-      E.rowoff = E.numrows;
-      break;
-    }
+  erow *row = &E.row[current];
+  char *match = strstr(row->render, query);
+  if(match){
+    last_match = current;
+    E.cy = current;
+    E.cx = editorRowCxToRx(row, match - row->render);
+    E.rowoff = E.numrows;
+
+    saved_hl_line = current;
+    saved_hl = malloc(row->rsize);
+    memcpy(saved_hl, row->hl, row->rsize);
+    memset(&row->hl[match - row->render], HL_MATCH, strlen(query));
+    break;
+  }
   }
 }
 
@@ -460,12 +532,12 @@ void editorFind() {
   char *query = editorPrompt("Find: %s (Use ESC/Arrows/Enter)", editorFindCallback);
 
   if(query){
-    free(query);
+  free(query);
   } else {
-    E.cx=saved_cx;
-    E.cy=saved_cy;
-    E.coloff=saved_coloff;
-    E.rowoff=saved_rowoff;
+  E.cx=saved_cx;
+  E.cy=saved_cy;
+  E.coloff=saved_coloff;
+  E.rowoff=saved_rowoff;
   }
 }
 
@@ -473,326 +545,348 @@ void editorFind() {
 
 /** append buffer */
 struct abuf {
-    char *b;
-    int len;
+  char *b;
+  int len;
 };
 #define ABUF_INIT {NULL, 0}
 
 void abAppend(struct abuf *ab, const char *s, int len) {
-    char *new = realloc(ab->b, ab->len + len);
+  char *new = realloc(ab->b, ab->len + len);
 
-    if (new == NULL) return;
-    memcpy(&new[ab->len], s, len);
-    ab->b = new;
-    ab->len += len;
+  if (new == NULL) return;
+  memcpy(&new[ab->len], s, len);
+  ab->b = new;
+  ab->len += len;
 }
 
 void abFree(struct abuf *ab) {
-    free(ab->b);
+  free(ab->b);
 }
 
 
 /** output */
 void editorScroll() {
-    E.rx = 0;
-    if (E.cy < E.numrows) {
-        E.rx = editorRowCxToRx(&E.row[E.cy], E.cx);
-    }
+  E.rx = 0;
+  if (E.cy < E.numrows) {
+    E.rx = editorRowCxToRx(&E.row[E.cy], E.cx);
+  }
 
 
-    if (E.cy < E.rowoff) {
-        E.rowoff = E.cy;
-    }
-    if (E.cy >= E.rowoff + E.screenrows) {
-        E.rowoff = E.cy - E.screenrows + 1;
-    }
-    if (E.rx < E.coloff) {
-        E.coloff = E.rx;
-    }
-    if (E.rx >= E.coloff + E.screencols) {
-        E.coloff = E.rx - E.screencols + 1;
-    }
+  if (E.cy < E.rowoff) {
+    E.rowoff = E.cy;
+  }
+  if (E.cy >= E.rowoff + E.screenrows) {
+    E.rowoff = E.cy - E.screenrows + 1;
+  }
+  if (E.rx < E.coloff) {
+    E.coloff = E.rx;
+  }
+  if (E.rx >= E.coloff + E.screencols) {
+    E.coloff = E.rx - E.screencols + 1;
+  }
 }
 
 void editorDrawRows(struct abuf *ab) {
-    int y;
-    for (y = 0; y < E.screenrows; y++) {
-        int filerow = y + E.rowoff;
-        if (filerow >= E.numrows) { // Draw rows after buffer
-            if (E.numrows == 0 && y == E.screenrows / 3) {
-                char welcome[80];
-                int welcomelen = snprintf(welcome, sizeof welcome, "Tyrel Text Editor Deluxe -- version %s",
-                                          TTED_VERSION);
-                int padding = (E.screencols - welcomelen) / 2;
-                if (padding) {
-                    abAppend(ab, "~", 1);
-                    padding--;
-                }
-                while (padding--) abAppend(ab, " ", 1);
-                if (welcomelen > E.screencols) welcomelen = E.screencols;
-                abAppend(ab, welcome, welcomelen);
-            } else {
-                abAppend(ab, "~", 1);
-            }
-        } else { // draw buffer
-            int len = E.row[filerow].rsize - E.coloff;
-            if (len < 0) len = 0;
-            if (len > E.screencols) len = E.screencols; // truncate if further than columns
-            abAppend(ab, &E.row[filerow].render[E.coloff], len);
+  int y;
+  for (y = 0; y < E.screenrows; y++) {
+    int filerow = y + E.rowoff;
+    if (filerow >= E.numrows) { // Draw rows after buffer
+      if (E.numrows == 0 && y == E.screenrows / 3) {
+        char welcome[80];
+        int welcomelen = snprintf(welcome, sizeof welcome, "Tyrel Text Editor Deluxe -- version %s",
+                      TTED_VERSION);
+        int padding = (E.screencols - welcomelen) / 2;
+        if (padding) {
+          abAppend(ab, "~", 1);
+          padding--;
         }
-
-        abAppend(ab, "\x1b[K", 3);
-        abAppend(ab, "\r\n", 2);
+        while (padding--) abAppend(ab, " ", 1);
+        if (welcomelen > E.screencols) welcomelen = E.screencols;
+        abAppend(ab, welcome, welcomelen);
+      } else {
+        abAppend(ab, "~", 1);
+      }
+    } else { // draw buffer
+      int len = E.row[filerow].rsize - E.coloff;
+      if (len < 0) len = 0;
+      if (len > E.screencols) len = E.screencols; // truncate if further than columns
+      char *c = &E.row[filerow].render[E.coloff];
+      unsigned char *hl = &E.row[filerow].hl[E.coloff];
+      int current_color = -1;
+      int j;
+      for (j=0;j< len;j++){
+        if (hl[j] == HL_NORMAL){
+          if (current_color != -1){
+            abAppend(ab, "\x1b[39m", 5);
+            current_color = -1;
+          }
+          abAppend(ab, &c[j], 1);
+        } else {
+          int color = editorSyntaxToColor(hl[j]);
+          if (color != current_color) {
+            current_color = color;
+            char buf[16];
+            int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", color);
+            abAppend(ab, buf, clen);
+          }
+          abAppend(ab, &c[j], 1);
+        }
+      }
+      abAppend(ab, "\x1b[39m", 5);
     }
+
+    abAppend(ab, "\x1b[K", 3);
+    abAppend(ab, "\r\n", 2);
+  }
 }
 
 void editorDrawStatusBar(struct abuf *ab) {
-    abAppend(ab, "\x1b[7m", 4);
-    char status[80], rstatus[80];
-    int len = snprintf(status, sizeof(status), "%.20s - %d lines %s",
-                       E.filename ? E.filename : "[No Name]", E.numrows,
-                       E.dirty ? "(modified)" : "");
-    int rlen = snprintf(rstatus, sizeof(rstatus), "%d/%d", E.cy + 1, E.numrows);
-    if (len > E.screencols) len = E.screencols;
-    abAppend(ab, status, len);
-    while (len < E.screencols) {
-        if (E.screencols - len == rlen) {
-            abAppend(ab, rstatus, rlen);
-            break;
-        } else {
-            abAppend(ab, " ", 1);
-            len++;
-        }
+  abAppend(ab, "\x1b[7m", 4);
+  char status[80], rstatus[80];
+  int len = snprintf(status, sizeof(status), "%.20s - %d lines %s",
+             E.filename ? E.filename : "[No Name]", E.numrows,
+             E.dirty ? "(modified)" : "");
+  int rlen = snprintf(rstatus, sizeof(rstatus), "%d/%d", E.cy + 1, E.numrows);
+  if (len > E.screencols) len = E.screencols;
+  abAppend(ab, status, len);
+  while (len < E.screencols) {
+    if (E.screencols - len == rlen) {
+      abAppend(ab, rstatus, rlen);
+      break;
+    } else {
+      abAppend(ab, " ", 1);
+      len++;
     }
+  }
 
-    abAppend(ab, "\x1b[m", 3);
-    abAppend(ab, "\r\n", 2);
+  abAppend(ab, "\x1b[m", 3);
+  abAppend(ab, "\r\n", 2);
 }
 
 void editorDrawMessageBar(struct abuf *ab) {
-    abAppend(ab, "\x1b[K", 3);
-    int msglen = strlen(E.statusmsg);
-    if (msglen > E.screencols) msglen = E.screencols;
-    if (msglen && time(NULL) - E.statusmsg_time < 5) {
-        abAppend(ab, E.statusmsg, msglen);
-    }
+  abAppend(ab, "\x1b[K", 3);
+  int msglen = strlen(E.statusmsg);
+  if (msglen > E.screencols) msglen = E.screencols;
+  if (msglen && time(NULL) - E.statusmsg_time < 5) {
+    abAppend(ab, E.statusmsg, msglen);
+  }
 }
 
 
 void editorRefreshScreen() {
-    editorScroll();
+  editorScroll();
 
-    struct abuf ab = ABUF_INIT;
-    abAppend(&ab, "\x1b[?25l", 6);
-    abAppend(&ab, "\x1b[H", 3); // Cursor Position home
-    editorDrawRows(&ab);
-    editorDrawStatusBar(&ab);
-    editorDrawMessageBar(&ab);
+  struct abuf ab = ABUF_INIT;
+  abAppend(&ab, "\x1b[?25l", 6);
+  abAppend(&ab, "\x1b[H", 3); // Cursor Position home
+  editorDrawRows(&ab);
+  editorDrawStatusBar(&ab);
+  editorDrawMessageBar(&ab);
 
-    char buf[32];
-    snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) + 1, (E.rx - E.coloff) + 1);
-    abAppend(&ab, buf, strlen(buf));
-    abAppend(&ab, "\x1b[?25h", 6);
+  char buf[32];
+  snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) + 1, (E.rx - E.coloff) + 1);
+  abAppend(&ab, buf, strlen(buf));
+  abAppend(&ab, "\x1b[?25h", 6);
 
-    write(STDOUT_FILENO, ab.b, ab.len);
-    abFree(&ab);
+  write(STDOUT_FILENO, ab.b, ab.len);
+  abFree(&ab);
 }
 
 void editorSetStatusMessage(const char *fmt, ...) {
-    va_list ap;
-    va_start(ap, fmt);
-    vsnprintf(E.statusmsg, sizeof(E.statusmsg), fmt, ap);
-    va_end(ap);
-    E.statusmsg_time = time(NULL);
+  va_list ap;
+  va_start(ap, fmt);
+  vsnprintf(E.statusmsg, sizeof(E.statusmsg), fmt, ap);
+  va_end(ap);
+  E.statusmsg_time = time(NULL);
 }
 
 
 /** input */
 char *editorPrompt(char *prompt, void(*callback)(char *, int)){
-    size_t bufsize = 128;
-    char *buf = malloc(bufsize);
+  size_t bufsize = 128;
+  char *buf = malloc(bufsize);
 
-    size_t buflen = 0;
-    buf[0] = '\0';
+  size_t buflen = 0;
+  buf[0] = '\0';
 
-    while(1){
-        editorSetStatusMessage(prompt, buf);
-        editorRefreshScreen();
-        int c = editorReadKey();
-        if (c ==  DEL_KEY || c == CTRL_KEY('h') || c == BACKSPACE) {
-          if (buflen != 0) buf[--buflen] = '\0';
-        } else if (c == '\x1b'){
-          editorSetStatusMessage("");
-          if (callback) callback(buf, c);
-          free(buf);
-          return NULL;
-        } else if (c == '\r') {
-            if (buflen != 0){
-                editorSetStatusMessage("");
-          if (callback) callback(buf, c);
-                return buf;
-            }
-        } else if (!iscntrl(c) && c < 128){
-            if(buflen==bufsize-1){
-                bufsize *=2;
-                buf = realloc(buf, bufsize);
-            }
-            buf[buflen++] = c;
-            buf[buflen] = '\0';
-        }
-
-        if (callback) callback(buf, c);
+  while(1){
+    editorSetStatusMessage(prompt, buf);
+    editorRefreshScreen();
+    int c = editorReadKey();
+    if (c ==  DEL_KEY || c == CTRL_KEY('h') || c == BACKSPACE) {
+      if (buflen != 0) buf[--buflen] = '\0';
+    } else if (c == '\x1b'){
+      editorSetStatusMessage("");
+      if (callback) callback(buf, c);
+      free(buf);
+      return NULL;
+    } else if (c == '\r') {
+      if (buflen != 0){
+        editorSetStatusMessage("");
+      if (callback) callback(buf, c);
+        return buf;
+      }
+    } else if (!iscntrl(c) && c < 128){
+      if(buflen==bufsize-1){
+        bufsize *=2;
+        buf = realloc(buf, bufsize);
+      }
+      buf[buflen++] = c;
+      buf[buflen] = '\0';
     }
+
+    if (callback) callback(buf, c);
+  }
 }
 
 void editorMoveCursor(int key) {
-    erow *row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
+  erow *row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
 
-    switch (key) {
-        case ARROW_LEFT:
-            if (E.cx != 0) {
-                E.cx--;
-            } else if (E.cy > 0) {
-                E.cy--;
-                E.cx = E.row[E.cy].size;
-            }
-            break;
-        case ARROW_RIGHT:
-            if (row && E.cx < row->size) {
-                E.cx++;
-            } else if (row && E.cx == row->size) {
-                E.cy++;
-                E.cx = 0;
-            }
-            break;
-        case ARROW_UP:
-            if (E.cy != 0) {
-                E.cy--;
-            }
-            break;
-        case ARROW_DOWN:
-            if (E.cy != E.numrows) {
-                E.cy++;
-            }
-            break;
-    }
+  switch (key) {
+    case ARROW_LEFT:
+      if (E.cx != 0) {
+        E.cx--;
+      } else if (E.cy > 0) {
+        E.cy--;
+        E.cx = E.row[E.cy].size;
+      }
+      break;
+    case ARROW_RIGHT:
+      if (row && E.cx < row->size) {
+        E.cx++;
+      } else if (row && E.cx == row->size) {
+        E.cy++;
+        E.cx = 0;
+      }
+      break;
+    case ARROW_UP:
+      if (E.cy != 0) {
+        E.cy--;
+      }
+      break;
+    case ARROW_DOWN:
+      if (E.cy != E.numrows) {
+        E.cy++;
+      }
+      break;
+  }
 
-    // Snap cursor
-    row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
-    int rowlen = row ? row->size : 0;
-    if (E.cx > rowlen) {
-        E.cx = rowlen;
-    }
+  // Snap cursor
+  row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
+  int rowlen = row ? row->size : 0;
+  if (E.cx > rowlen) {
+    E.cx = rowlen;
+  }
 }
 
 void editorProcessKeypress() {
-    static int quit_times = TTED_QUIT_TIMES;
+  static int quit_times = TTED_QUIT_TIMES;
 
-    int c = editorReadKey();
-    switch (c) {
-        case '\r':
-            editorInsertNewLine();
-            break;
-        case CTRL_KEY('q'):
-            if (E.dirty && quit_times > 0) {
-                editorSetStatusMessage("WARNING!!! File has unsaved changes. "
-                                       "Press Ctrl-Q %d more times to quit.", quit_times);
-                quit_times--;
-                return;
-            }
+  int c = editorReadKey();
+  switch (c) {
+    case '\r':
+      editorInsertNewLine();
+      break;
+    case CTRL_KEY('q'):
+      if (E.dirty && quit_times > 0) {
+        editorSetStatusMessage("WARNING!!! File has unsaved changes. "
+                     "Press Ctrl-Q %d more times to quit.", quit_times);
+        quit_times--;
+        return;
+      }
 
-            write(STDOUT_FILENO, "\x1b[2J", 4);
-            write(STDOUT_FILENO, "\x1b[H", 3);
-            exit(0);
-            break;
-        case CTRL_KEY('s'):
-            editorSave();
-            break;
+      write(STDOUT_FILENO, "\x1b[2J", 4);
+      write(STDOUT_FILENO, "\x1b[H", 3);
+      exit(0);
+      break;
+    case CTRL_KEY('s'):
+      editorSave();
+      break;
 
-        case HOME_KEY:
-            E.cx = 0;
-            break;
+    case HOME_KEY:
+      E.cx = 0;
+      break;
 
-        case END_KEY:
-            if (E.cy < E.numrows) {
-                E.cx = E.row[E.cy].size;
-            }
-            break;
+    case END_KEY:
+      if (E.cy < E.numrows) {
+        E.cx = E.row[E.cy].size;
+      }
+      break;
 
-        case CTRL_KEY('f'):
-            editorFind();
-            break;
+    case CTRL_KEY('f'):
+      editorFind();
+      break;
 
-        case BACKSPACE:
-        case CTRL_KEY('h'):
-        case DEL_KEY:
-            if (c == DEL_KEY) editorMoveCursor(ARROW_RIGHT);
-            editorDelChar();
-            break;
+    case BACKSPACE:
+    case CTRL_KEY('h'):
+    case DEL_KEY:
+      if (c == DEL_KEY) editorMoveCursor(ARROW_RIGHT);
+      editorDelChar();
+      break;
 
-        case PAGE_UP:
-        case PAGE_DOWN: {
-            if (c == PAGE_UP) {
-                E.cy = E.rowoff;
-            } else if (c == PAGE_DOWN) {
-                E.cy = E.rowoff + E.screenrows - 1;
-                if (E.cy > E.numrows) {
-                    E.cy = E.numrows;
-                }
-            }
-            int times = E.screenrows;
-            while (times--)
-                editorMoveCursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
+    case PAGE_UP:
+    case PAGE_DOWN: {
+      if (c == PAGE_UP) {
+        E.cy = E.rowoff;
+      } else if (c == PAGE_DOWN) {
+        E.cy = E.rowoff + E.screenrows - 1;
+        if (E.cy > E.numrows) {
+          E.cy = E.numrows;
         }
-            break;
-        case ARROW_UP:
-        case ARROW_DOWN:
-        case ARROW_LEFT:
-        case ARROW_RIGHT:
-            editorMoveCursor(c);
-            break;
-        case CTRL_KEY('l'):
-        case '\x1b':
-            break;
-
-        default:
-            editorInsertChar(c);
-            break;
+      }
+      int times = E.screenrows;
+      while (times--)
+        editorMoveCursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
     }
+      break;
+    case ARROW_UP:
+    case ARROW_DOWN:
+    case ARROW_LEFT:
+    case ARROW_RIGHT:
+      editorMoveCursor(c);
+      break;
+    case CTRL_KEY('l'):
+    case '\x1b':
+      break;
 
-    quit_times = TTED_QUIT_TIMES;
+    default:
+      editorInsertChar(c);
+      break;
+  }
+
+  quit_times = TTED_QUIT_TIMES;
 }
 
 /** init */
 void initEditor() {
-    E.cx = 0;
-    E.cy = 0;
-    E.rx = 0;
-    E.rowoff = 0;
-    E.coloff = 0;
-    E.numrows = 0;
-    E.row = NULL;
-    E.dirty = 0;
-    E.filename = NULL;
-    E.statusmsg[0] = '\0';
-    E.statusmsg_time = 0;
+  E.cx = 0;
+  E.cy = 0;
+  E.rx = 0;
+  E.rowoff = 0;
+  E.coloff = 0;
+  E.numrows = 0;
+  E.row = NULL;
+  E.dirty = 0;
+  E.filename = NULL;
+  E.statusmsg[0] = '\0';
+  E.statusmsg_time = 0;
 
-    if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
-    E.screenrows -= 2;
+  if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
+  E.screenrows -= 2;
 }
 
 int main(int argc, char *argv[]) {
-    enableRawMode();
-    initEditor();
-    if (argc >= 2) {
-        editorOpen(argv[1]);
-    }
+  enableRawMode();
+  initEditor();
+  if (argc >= 2) {
+    editorOpen(argv[1]);
+  }
 
-    editorSetStatusMessage("HELP: Ctrl-Q = quit; Ctrl-S = save; Ctrl-f = find");
+  editorSetStatusMessage("HELP: Ctrl-Q = quit; Ctrl-S = save; Ctrl-f = find");
 
-    while (1) {
-        editorRefreshScreen();
-        editorProcessKeypress();
-    }
-    return 0;
+  while (1) {
+    editorRefreshScreen();
+    editorProcessKeypress();
+  }
+  return 0;
 }