editor.c: a joke, an editor which writes a c program

1 files changed, 95 insertions, 0 deletions

diff --git a/editor.c b/editor.c
new file mode 100644
index 0000000..afea796
--- /dev/null
+++ b/editor.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2015  Tomasz Kramkowski <tk@the-tk.com>
+ *
+ * This program is free software. It is licensed under version 3 of the
+ * GNU General Public License.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see [http://www.gnu.org/licenses/].
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <error.h>
+#include <ncurses.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+bool running = true;
+size_t position = 0;
+
+char *program = "#include <stdio.h>\n" \
+		"\n" \
+		"int main(void)\n" \
+		"{\n" \
+		"\tprintf(\"Hello World\\n\");\n" \
+		"\n" \
+		"\treturn 0;\n" \
+		"}";
+
+char *usage = "%sUsage:\n" \
+	      "\t%s <filename>";
+
+void print_screen(void)
+{
+	mvaddnstr(0, 0, program, position);
+}
+
+int getch_nodelay(void)
+{
+	int retval;
+
+	nodelay(stdscr, TRUE);
+	retval = getch();
+	nodelay(stdscr, FALSE);
+
+	return retval;
+}
+
+
+void poll_input(void)
+{
+	int c = getch();
+
+	if (c == 27 && getch_nodelay() == ERR) {
+		running = false;
+		return;
+	}
+
+	if (program[position] == c)
+		position++;
+}
+
+int main(int argc, char **argv)
+{
+	FILE *file;
+
+	if (argc != 2)
+		error(1, 0, usage, "Incorrect number of arguments\n",
+		      program_invocation_name);
+
+	cbreak();
+	initscr();
+	noecho();
+
+	intrflush(stdscr, FALSE);
+
+	print_screen();
+	while (running) {
+		poll_input();
+		print_screen();
+	}
+
+	endwin();
+
+	if (file = fopen(argv[1], "w"), file == NULL)
+		error(1, errno, "Could not access %s", argv[1]);
+
+	fwrite(program, 1, position, file);
+
+	fclose(file);
+
+	printf("Saved.\n");
+
+	return 0;
+}