wip: pgo without Wayland

* Split up source files into several static libraries: misc + vtlib
* Add a new executable, pgo, that links to vtlib
* pgo is kind of like a mock test:
  - provides stub implementations of functions not present in vtlib
  - sets up a dummy terminal instance
  - calls vt_from_slave() with static (pre-generated) content

pgo.c

@@ -0,0 +1,233 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "async.h"
+#include "user-notification.h"
+#include "vt.h"
+
+void wl_proxy_marshal(struct wl_proxy *p, uint32_t opcode, ...) {}
+
+enum async_write_status
+async_write(int fd, const void *data, size_t len, size_t *idx)
+{
+    return ASYNC_WRITE_DONE;
+}
+
+bool
+selection_enabled(const struct terminal *term, struct seat *seat)
+{
+    return true;
+}
+
+void selection_cancel(struct terminal *term) {}
+void selection_clipboard_unset(struct seat *seat) {}
+void selection_primary_unset(struct seat *seat) {}
+
+bool
+text_to_clipboard(
+    struct seat *seat, struct terminal *term, char *text, uint32_t serial)
+{
+    return true;
+}
+
+bool
+text_to_primary(
+    struct seat *seat, struct terminal *term, char *text, uint32_t serial)
+{
+    return true;
+}
+
+bool
+selection_clipboard_has_data(const struct seat *seat)
+{
+    return true;
+}
+
+bool
+selection_primary_has_data(const struct seat *seat)
+{
+    return true;
+}
+
+void
+text_from_clipboard(
+    struct seat *seat, struct terminal *term,
+    void (*cb)(char *data, size_t size, void *user),
+    void (*done)(void *user), void *user)
+{
+}
+
+void
+text_from_primary(
+    struct seat *seat, struct terminal *term,
+    void (*cb)(char *data, size_t size, void *user),
+    void (*dont)(void *user), void *user)
+{
+}
+
+bool
+selection_on_rows(const struct terminal *term, int start, int end)
+{
+    return false;
+}
+
+void selection_view_up(struct terminal *term, int new_view) {}
+void selection_view_down(struct terminal *term, int new_view) {}
+
+bool
+fdm_add(struct fdm *fdm, int fd, int events, fdm_handler_t handler, void *data)
+{
+    return true;
+}
+
+bool
+fdm_del(struct fdm *fdm, int fd)
+{
+    return true;
+}
+
+bool
+fdm_event_add(struct fdm *fdm, int fd, int events)
+{
+    return true;
+}
+
+bool
+fdm_event_del(struct fdm *fdm, int fd, int events)
+{
+    return true;
+}
+
+bool
+render_resize_force(struct terminal *term, int width, int height)
+{
+    return true;
+}
+
+void render_refresh(struct terminal *term) {}
+void render_refresh_csd(struct terminal *term) {}
+void render_refresh_title(struct terminal *term) {}
+
+bool
+render_xcursor_set(struct seat *seat, struct terminal *term, const char *xcursor)
+{
+    return true;
+}
+
+struct wl_window *
+wayl_win_init(struct terminal *term)
+{
+    return NULL;
+}
+
+void wayl_win_destroy(struct wl_window *win) {}
+
+bool
+spawn(struct reaper *reaper, const char *cwd, char *const argv[],
+      int stdin_fd, int stdout_fd, int stderr_fd)
+{
+    return true;
+}
+
+pid_t
+slave_spawn(
+    int ptmx, int argc, const char *cwd, char *const *argv, const char *term_env,
+    const char *conf_shell, bool login_shell,
+    const user_notifications_t *notifications)
+{
+    return 0;
+}
+
+int
+render_worker_thread(void *_ctx)
+{
+    return 0;
+}
+
+struct extraction_context *
+extract_begin(enum selection_kind kind)
+{
+    return NULL;
+}
+
+bool
+extract_one(
+    const struct terminal *term, const struct row *row, const struct cell *cell,
+    int col, void *context)
+{
+    return true;
+}
+
+bool
+extract_finish(struct extraction_context *context, char **text, size_t *len)
+{
+    return true;
+}
+
+int
+main(int argc, const char *const *argv)
+{
+    const int row_count = 24;
+    const int col_count = 80;
+    const int grid_row_count = 1024;
+
+    struct row **rows = calloc(grid_row_count, sizeof(rows[0]));
+    for (int i = 0; i < grid_row_count; i++) {
+        rows[i] = calloc(1, sizeof(*rows[i]));
+        rows[i]->cells = calloc(col_count, sizeof(rows[i]->cells[0]));
+    }
+
+    struct terminal term = {
+        .grid = &term.normal,
+        .normal = {
+            .num_rows = grid_row_count,
+            .num_cols = col_count,
+            .rows = rows,
+            .cur_row = rows[0],
+        },
+        .alt = {
+            .num_rows = grid_row_count,
+            .num_cols = col_count,
+            .rows = rows,
+            .cur_row = rows[0],
+        },
+        .scale = 1,
+        .width = col_count * 8,
+        .height = row_count * 15,
+        .cols = col_count,
+        .rows = row_count,
+        .cell_width = 8,
+        .cell_height = 15,
+        .scroll_region = {
+            .start = 0,
+            .end = row_count,
+        },
+    };
+
+    struct stat st;
+    if (stat(argv[1], &st) < 0)
+        return 1;
+    uint8_t *data = malloc(st.st_size);
+    int fd = open(argv[1], O_RDONLY);
+    if (fd < 0)
+        return 1;
+    ssize_t amount = read(fd, data, st.st_size);
+    if (amount != st.st_size)
+        return 1;
+    close(fd);
+
+    vt_from_slave(&term, data, st.st_size);
+
+    free(data);
+    for (int i = 0; i < grid_row_count; i++) {
+        free(rows[i]->cells);
+        free(rows[i]);
+    }
+    free(rows);
+    return 0;
+}