init with proof of concept code

.gitignore

@@ -0,0 +1 @@
+raw_terminal

Main.cpp

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+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+
+// https://viewsourcecode.org/snaptoken/kilo/02.enteringRawMode.html
+
+struct termios orig_termios;
+
+void disableRawMode() {
+    tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios);
+}
+
+void enableRawMode() {
+    tcgetattr(STDIN_FILENO, &orig_termios);
+    atexit(disableRawMode);
+
+    struct termios raw;
+    tcgetattr(STDIN_FILENO, &raw);
+    raw.c_iflag &= ~(ICRNL | IXON);
+    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN /*| ISIG*/);
+    raw.c_cc[VMIN] = 0;
+    raw.c_cc[VTIME] = 0;
+
+    tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
+}
+
+char buffer[256];
+int move = 0;
+
+void refreshLine() {
+    putchar('\r');
+    printf("> %s", buffer);
+    if(move > 0) {
+        printf("\33[%dD", move);
+    }
+    fflush(STDIN_FILENO);
+}
+
+int main() {
+    enableRawMode();
+
+    int index = 0;
+    buffer[0] = '\0';
+
+    while(1) {
+        int c = 0;
+        int bytes = read(STDIN_FILENO, &c, 1);
+
+        printf("\33[2K\r");
+
+        if(bytes < 0) {
+            break;
+        } else if(bytes == 0) {
+            //printf("timeout\n");
+            refreshLine();
+            continue;
+        } else if(c == 'q') {
+            break;
+        }
+
+        if(c == 27) {
+            char escape[10];
+            int escapeBytes = read(STDIN_FILENO, escape, 10);
+            printf("Escape sequence of length: %d\n", escapeBytes);
+            if(escapeBytes == 2) {
+                if(escape[0] == '[' && escape[1] == 'D' && move < index) {
+                    move++;
+                }
+                if(escape[0] == '[' && escape[1] == 'C' && move > 0) {
+                    move--;
+                }
+            }
+
+            continue;
+        }
+
+        if(iscntrl(c)) {
+            switch(c) {
+                case 127:
+                    if(index > 0) {
+                        if(move == 0) {
+                            index--;
+                            buffer[index] = '\0';
+                        } else {
+                            int pos = index - move - 1;
+                            if(pos >= 0) {
+                                while(buffer[pos] != '\0') {
+                                    buffer[pos] = buffer[pos + 1];
+                                    pos++;
+                                }
+                                index--;
+                            }
+                        }
+                    }
+                    break;
+                case 13:
+                    puts(buffer);
+                    index = 0;
+                    buffer[0] = '\0';
+                    move = 0;
+                    break;
+            }
+            printf("%d\n", c);
+        } else {
+            printf("%d ('%c')\n", c, c);
+            if(move == 0) {
+                buffer[index++] = c;
+                buffer[index] = '\0';
+            }
+        }
+        refreshLine();
+    }
+    return 0;
+}

Makefile

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+all: raw_terminal
+	./raw_terminal
+
+raw_terminal: Main.cpp
+	g++ -o $@ Main.cpp -Wall -Wextra -Werror -pedantic
+
+clean:
+	rm -f raw_terminal