Initial import, starting with kyle's editor.

.hgignore

@@ -0,0 +1 @@
+.o$

ke/Makefile

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+BIN :=		ke
+OBJS :=		main.o
+
+LDFLAGS :=	-static
+CFLAGS :=	-pedantic -Wall -Werror -Wextra -O2 -std=c99
+
+.PHONY: all
+all: $(BIN) run
+
+$(BIN): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $(OBJS)
+
+.PHONY: clean
+clean:
+	rm -f $(BIN) $(OBJS)
+
+.PHONY: run
+run: $(BIN)
+	./$(BIN)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $@ $<

ke/keys.txt

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+An Exploration of the Keys
+==========================
+
+ESC: 1b
+
+Function keys: 1b followed by
+
+F1	F2	F3	F4	F5	F6	F7	F8
+4f O	4f O	4f O	4f O	5b	5b	5b	5b
+50 P	51 Q	52 R	54 S	31 1	31 1	31 1	31 1
+				35 5	37 7	38 8	39 9
+				7e ~	7e ~	7e ~	7e ~
+
+F9	F10	F11	F12
+5b [	5b [	5b [	5b [
+32 2	32 2	32 2	32 2
+30 0	31 1	33 3	34 4
+7e ~	7e ~	7e ~	7e ~
+
+DEL	7f	- but it should be a 4-byte escape sequence?
+BKSP	7f
+
+Arrow keys: 1b followed by
+UP	DN	LF	RT
+5b [	5b [	5b [	5b [
+41 A	42 B	44 D	43 C
+
+Other keys: 1b followed by
+
+HOME	END	PGUP	PGDN	INS
+5b [	5b [	5b [	5b [	5b [
+48 H	46 F	35 5	36 6	32 2
+		7e ~	7e ~	7e ~
+
+
+Notes: any time you see escape, you must process another key to figure
+out what to do.

ke/main.c

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+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+
+
+/* entry_term contains a snapshot of the termios settings at startup. */
+struct termios	entry_term;
+
+
+/*
+ * A text editor needs the terminal to be in raw mode; but the default
+ * is to be in canonical (cooked) mode, which is a buffered input mode.
+ */
+
+static void
+enable_termraw()
+{
+	struct termios	raw;
+
+	/* Read the current terminal parameters for standard input. */
+	tcgetattr(STDIN_FILENO, &raw);
+
+	/*
+	 * Turn off the local ECHO mode, which we need to do in raw mode
+	 * because what gets displayed is going to need extra control.
+	 *
+	 * NOTE(kyle): look into cfmakeraw, which will require
+	 * snapshotting.
+	 */
+	raw.c_lflag &= ~(ECHO|ICANON);
+
+	/*
+	 * Now write the terminal parameters to the current terminal,
+	 * after flushing any waiting input out.
+	 */
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
+}
+
+
+static void
+disable_termraw()
+{
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &entry_term);
+}
+
+
+int
+main()
+{
+	char	c;
+
+	/* prepare the terminal */
+	tcgetattr(STDIN_FILENO, &entry_term);
+	atexit(disable_termraw);
+	enable_termraw();
+
+	while (read(STDIN_FILENO, &c, 1) == 1 && c != 'q') {
+		if (iscntrl(c)) {
+			printf("%02x\n", c);
+		} else {
+			printf("%02x ('%c')\n", c, c);
+		}
+	}
+
+	return 0;
+}