Hello world curses app

.gitignore

@@ -1,4 +1,6 @@
 *.swp
 *.swo
 
-*.o
+bazel-*
+
+tags

BUILD

@@ -0,0 +1,11 @@
+cc_binary(
+    name = "ncac",
+    srcs = [
+        "ncac.c",
+        "ncac.h",
+    ],
+    deps = [
+        "//ui",
+        "@system_include//:curses"
+    ],
+)

WORKSPACE

@@ -0,0 +1,11 @@
+new_local_repository(
+    name = "system_include",
+    path = "/usr/lib",
+    build_file_content = """
+cc_library(
+    name = "curses",
+    srcs = ["libcurses.dylib"],
+    visibility = ["//visibility:public"],
+)
+    """,
+)

ncac.c

@@ -0,0 +1,54 @@
+#include "ncac.h"
+
+#include <curses.h>
+#include <stdlib.h>
+#include <term.h>
+
+#include "ui/base.h"
+
+
+int main(int argc, char **argv) {
+  (void)argc;
+  (void)argv;
+  setup();
+
+  char input;
+
+  int curs_x = 0;
+  int curs_y = 0;
+
+  while(1) {
+    switch (input = getch()) {
+      case 'a':
+        draw_text(&curs_x, &curs_y, "Hello, world!");
+        break;
+      default:
+        finish(0);
+        break;
+    }
+  }
+  return 0;
+}
+
+void finish(int sig) {
+  (void)sig;
+  endwin();
+  exit(0);
+}
+
+void setup() {
+  // initialize ncurses
+  initscr();
+
+  cbreak();
+
+
+
+  // don't echo input
+  noecho();
+
+  nonl();
+
+  // install handlers
+  signal(SIGINT, &finish);
+}

ncac.h

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+#ifndef _NCAC_H_
+#define _NCAC_H_
+
+/**
+ * Cleans up before exit. Installed on SIGINT
+ */
+void finish();
+
+/**
+ * Sets up ncurses and internal data structures
+ */
+void setup();
+
+
+#endif // _NCAC_H_

ui/BUILD

@@ -0,0 +1,7 @@
+cc_library(
+    name="ui",
+    srcs = ["base.c"],
+    hdrs = ["base.h"],
+    deps = ["@system_include//:curses"],
+    visibility = ["//visibility:public"],
+)

ui/base.c

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+#include "base.h"
+
+#include <curses.h>
+#include <string.h>
+
+void draw_text(int *x, int *y, char *text) {
+  size_t len = strlen(text);
+  if (!len) return;
+
+  mvaddch(*x, *y, text[0]);
+
+  for (size_t i=1; i < strlen(text); i++) {
+    addch(text[i]);
+  }
+
+  getyx(stdscr, *y, *x);
+}

ui/base.h

@@ -0,0 +1,10 @@
+#ifndef UI_BASE_H_
+#define UI_BASE_H_
+
+/**
+ * Prints the string text starting at position *x, *y. x and y are updated to
+ * the position after the last character
+ */
+void draw_text(int *x, int *y, char *text);
+
+#endif // UI_BASE_H_