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j and k bindings, caught up to the end of the first video

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This commit is contained in:
Zev Averbach
2023-01-17 09:54:06 +01:00
parent bddcddc9b8
commit f199ff59a1
2 changed files with 52 additions and 7 deletions
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input.txt
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59
main.c
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@@ -8,7 +8,7 @@
#include <unistd.h> #include <unistd.h>
#define EDITOR_CAPACITY 1024 #define EDITOR_CAPACITY (10*1024)
typedef struct { typedef struct {
size_t begin; size_t begin;
@@ -24,6 +24,8 @@ typedef struct {
} Editor; } Editor;
void editor_compute_lines(Editor *e) { void editor_compute_lines(Editor *e) {
// populate `e` with entries for `e->lines` and `e->data_count`
e->lines_count = 0;
size_t begin = 0; size_t begin = 0;
for (size_t i = 0; i < e->data_count; ++i) { for (size_t i = 0; i < e->data_count; ++i) {
if (e->data[i] == '\n') { if (e->data[i] == '\n') {
@@ -38,6 +40,16 @@ void editor_compute_lines(Editor *e) {
e->lines_count += 1; e->lines_count += 1;
} }
void editor_insert_char(Editor *e, char x) {
if (e->data_count < EDITOR_CAPACITY) {
memmove(&e->data[e->cursor + 1], &e->data[e->cursor], e->data_count - e->cursor);
e->data[e->cursor] = x;
e->cursor += 1;
e->data_count += 1;
editor_compute_lines(e);
}
}
size_t editor_current_line(const Editor *e) { size_t editor_current_line(const Editor *e) {
assert(e->cursor <= e->data_count); assert(e->cursor <= e->data_count);
Line line; Line line;
@@ -64,7 +76,7 @@ void editor_rerender(const Editor *e) {
); );
} }
int editor_start_interactive(Editor *e) { int editor_start_interactive(Editor *e, const char * filepath) {
if (!isatty(0)) { if (!isatty(0)) {
fprintf(stderr, "Please run in the terminal!\n"); fprintf(stderr, "Please run in the terminal!\n");
return 1; return 1;
@@ -98,10 +110,23 @@ int editor_start_interactive(Editor *e) {
while (!quit && !feof(stdin)) { while (!quit && !feof(stdin)) {
editor_rerender(e); editor_rerender(e);
if (insert) { if (insert) {
int i = fgetc(stdin);
switch (i) {
case 27: {
insert = false;
FILE *f = fopen(filepath, "wb");
fwrite(e->data, 1, e->data_count, f);
} break;
default: {
editor_insert_char(e, i);
}
}
} else { } else {
int x = fgetc(stdin); int x = fgetc(stdin);
switch (x) { switch (x) {
case 'i': {
insert = true;
} break;
case 'q': { case 'q': {
quit = true; quit = true;
} break; } break;
@@ -115,6 +140,26 @@ int editor_start_interactive(Editor *e) {
e->cursor += 1; e->cursor += 1;
} }
} break; } break;
case 'j': {
size_t current_line = editor_current_line(e);
if (current_line < e->lines_count - 1) {
size_t current_col = e->cursor - e->lines[current_line].begin;
e->cursor = e->lines[current_line + 1].begin + current_col;
if (e->cursor > e->lines[current_line + 1].end) {
e->cursor = e->lines[current_line + 1].end;
}
}
} break;
case 'k': {
size_t current_line = editor_current_line(e);
if (current_line > 0) {
size_t current_col = e->cursor - e->lines[current_line].begin;
e->cursor = e->lines[current_line - 1].begin + current_col;
if (e->cursor > e->lines[current_line - 1].end) {
e->cursor = e->lines[current_line - 1].end;
}
}
} break;
} }
} }
} }
@@ -129,14 +174,14 @@ int editor_start_interactive(Editor *e) {
static Editor editor; static Editor editor;
int main(int argc, char **argv) { int main(int num_args, char **args) {
if (argc < 2) { if (num_args < 2) {
fprintf(stderr, "Usage: zed <input.txt>\n"); fprintf(stderr, "Usage: zed <input.txt>\n");
fprintf(stderr, "ERROR: no input file was provided\n"); fprintf(stderr, "ERROR: no input file was provided\n");
return 1; return 1;
} }
const char *file_path = argv[1]; const char *file_path = args[1];
FILE *f = fopen(file_path, "rb"); FILE *f = fopen(file_path, "rb");
if (f == NULL) { if (f == NULL) {
fprintf( fprintf(
@@ -155,6 +200,6 @@ int main(int argc, char **argv) {
fclose(f); fclose(f);
editor_compute_lines(&editor); editor_compute_lines(&editor);
return editor_start_interactive(&editor); return editor_start_interactive(&editor, file_path);
return 0; return 0;
} }