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Detect filetype and apply syntax highlighting accordingly.

This commit is contained in:
Saumya Bhatnagar 2018-06-03 08:24:16 +05:30
parent f52c02e327
commit 083409143f
2 changed files with 64 additions and 7 deletions
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editor
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71
editor.c
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@ -23,6 +23,7 @@
#define EDITOR_VERSION "0.0.1"
#define EDITOR_TAB 8
#define EDITOR_QUIT_TIMES 1
#define HL_HIGHLIGHT_NUMBERS (1<<0)
enum editorKey {
BACKSPACE = 127,
@ -45,6 +46,12 @@ enum editorHighlight {
/*** data ***/
struct editorSyntax {
char *filetype;
char **filematch;
int flags;
};
typedef struct editorrow {
int length;
char *text;
@ -68,8 +75,22 @@ struct editorConfig {
char statusmsg[80];
time_t statusmsg_time;
int dirty;
struct editorSyntax *syntax;
} E;
/*** filetypes ***/
char *C_HL_extensions[] = { ".c", ".h", ".cpp", NULL };
struct editorSyntax HLDB[] = {
{
"c",
C_HL_extensions,
HL_HIGHLIGHT_NUMBERS
},
};
#define HLDB_ENTRIES (sizeof(HLDB) / sizeof(HLDB[0]))
/*** prototypes ***/
void editorSetStatusMessage(const char *formatstr, ...);
@ -224,18 +245,25 @@ int is_separator(int c) {
void editorUpdateSyntax(editorrow *row) {
row->hl = realloc(row->hl, row->rsize);
memset(row->hl, HL_NORMAL, row->rsize);
if (E.syntax == NULL) return;
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;
if (E.syntax->flags & HL_HIGHLIGHT_NUMBERS) {
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++;
}
@ -252,6 +280,31 @@ int editorSyntaxToColor(int hl) {
}
}
void editorSelectSyntaxHighlight() {
E.syntax = NULL;
if (E.filename == NULL) return;
char *ext = strrchr(E.filename, '.');
for (unsigned int j = 0; j < HLDB_ENTRIES; j++) {
struct editorSyntax *s = &HLDB[j];
unsigned int i = 0;
while (s->filematch[i]) {
int is_ext = (s->filematch[i][0] == '.');
if ((is_ext && ext && !strcmp(ext, s->filematch[i])) ||
(!is_ext && strstr(E.filename, s->filematch[i]))) {
E.syntax = s;
int filerow;
for (filerow = 0; filerow < E.numrows; filerow++) {
editorUpdateSyntax(&E.erow[filerow]);
}
return;
}
i++;
}
}
}
/*** row operations ***/
void editorUpdateRow(editorrow * row) {
@ -430,6 +483,8 @@ void editorOpen(char * file) {
free(E.filename);
E.filename = strdup(file);
editorSelectSyntaxHighlight();
FILE *fp = fopen(file, "r");
if (!fp) {
die("fopen");
@ -482,6 +537,7 @@ void editorSave() {
editorSetStatusMessage("Save aborted");
return;
}
editorSelectSyntaxHighlight();
}
int len;
@ -655,7 +711,7 @@ void editorDrawStatusBar(struct AppendBuffer *ab) {
int len = snprintf(status, sizeof(status), "%.20s - %d lines %s",
E.filename ? E.filename : "[No Name]", E.numrows,
E.dirty ? "(modified)" : "");
int lineLen = snprintf(lineStatus, sizeof(lineStatus), "%d:%d", E.cursorY + 1, E.numrows);
int lineLen = snprintf(lineStatus, sizeof(lineStatus), "%s | %d:%d", E.syntax ? E.syntax->filetype : "no filetype", E.cursorY + 1, E.numrows);
if (len > E.screencols) {
len = E.screencols;
@ -905,6 +961,7 @@ void initEditor() {
E.statusmsg[0] = '\0';
E.statusmsg_time = 0;
E.dirty = 0;
E.syntax = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) {
die("getWindowSize");