fix: compilation warning for maybe unused variables

feature: shell - autocomplete and help menu improved

src/shell/exec.c

@@ -3,49 +3,68 @@
 #include "string.h"
 #include "terminal.h"
 
+#define NB_CMDS 8
+#define BORDER  "==========================================================="
+#define HEADER  "Welcome to bozOShell - Available Commands"
+
 extern struct screen *screen;
 
-static CMD_TOK find_command(char *line)
-{
-	size_t i = 0;
-	bool uwu = false;
-	CMD_TOK command = ERROR;
+struct shell_command {
+	char name[16];
+	char description[256];
+	void (*fn)(void);
+};
 
-	if (!line[0])
-		return command;
-	while (line[i]) {
-		if (line[i] == ' ') {
-			uwu = true;
-			break;
-		}
-		i++;
+static void help(void);
+
+static const struct shell_command commands[NB_CMDS] = {
+    {"help", "Print this help menu", help},
+    {"reboot", "Reboot the system", reboot},
+    {"poweroff", "Shut down the system", halt},
+    {"halt", "Stop all CPU functions", halt},
+    {"stack", "Print the stack trace", print_stack},
+    {"clear", "Clear the current terminal", terminal_clear},
+    {"date", "Display the current time and date (UTC+0)", date},
+    {"merdella", "Surprise", merdella},
+};
+
+static void help(void)
+{
+	const size_t padding = 15;
+
+	kprintf(0, "%s\n", BORDER);
+	kprintf(0, " %s\n", HEADER);
+	kprintf(0, "%s\n", BORDER);
+
+	for (size_t i = 0; i < sizeof(commands) / sizeof(commands[0]); i++) {
+		kprintf(0, " %s", commands[i].name);
+		for (size_t j = 0; j < (padding - strlen(commands[i].name));
+		     j++)
+			kprintf(0, " ");
+		kprintf(0, ": %s\n", commands[i].description);
+	}
+
+	kprintf(0, "%s\n", BORDER);
+}
+
+static void auto_complete(void)
+{
+	const size_t len = strlen(screen->line);
+	int nb_matches = 0;
+	const char *last_match;
+
+	for (size_t i = 0; i < NB_CMDS; i++) {
+		if (!strncmp(screen->line, commands[i].name, len)) {
+			nb_matches++;
+			last_match = commands[i].name;
+		}
+	}
+	if (nb_matches != 1)
+		return;
+	for (size_t i = len; last_match[i]; i++) {
+		screen->line[i] = last_match[i];
+		kprintf(0, "%c", screen->line[i]);
 	}
-	line[i] = '\0';
-	if (!strcmp(line, "help"))
-		command = HELP;
-	else if (!strcmp(line, "reboot"))
-		command = REBOOT;
-	else if (!strcmp(line, "poweroff"))
-		command = POWEROFF;
-	else if (!strcmp(line, "halt"))
-		command = HALT;
-	else if (!strcmp(line, "stack"))
-		command = STACK;
-	else if (!strcmp(line, "clear"))
-		command = CLEAR;
-	else if (!strcmp(line, "echo"))
-		command = ECHO;
-	else if (!strcmp(line, "color"))
-		command = COLOR;
-	else if (!strcmp(line, "merdella"))
-		command = MERDELLA;
-	else if (!strcmp(line, "date"))
-		command = DATE;
-	else
-		kprintf(0, "invalid command: %s\n", line);
-	if (uwu)
-		line[i] = ' ';
-	return command;
 }
 
 static void read_line(void)
@@ -67,8 +86,9 @@ static void read_line(void)
 				move_cursor(LEFT);
 				terminal_putchar(' ');
 				move_cursor(LEFT);
-			}
-			if (ev.c && i < size - 1) {
+			} else if (ev.scan_code == KEY_TAB && i) {
+				auto_complete();
+			} else if (ev.c && i < size - 1) {
 				kprintf(0, "%c", ev.c);
 				buf[i++] = ev.c;
 			}
@@ -86,50 +106,16 @@ void shell_init(void)
 	while (1) {
 		kprintf(0, PROMPT);
 		read_line();
-		switch (find_command(screen->line)) {
-		case HELP:
-			kprintf(0, "Welcome to bozOShell, the shell of "
-			           "bozOS\nAvailable commands: help, reboot, "
-			           "poweroff, echo, color, merdella\n");
-			break;
-		case REBOOT:
-			reboot();
-			break;
-		case POWEROFF:
-			kprintf(0, "powering off\n");
-			break;
-		case HALT:
-			halt();
-			break;
-		case STACK:
-			print_stack();
-			break;
-		case CLEAR:
-			terminal_clear();
-			break;
-		case ECHO:
-			kprintf(0, "echoing\n");
-			break;
-		case COLOR:
-			kprintf(0, "coloring\n");
-			break;
-		case MERDELLA: {
-			kprintf(0, POOP);
-			if (!strcmp("merdella --credits", screen->line))
-				kprintf(
-				    0,
-				    "\nThis ascii masterpiece has been created "
-				    "by Targon (/)\n");
-			break;
-		}
-		case DATE:
-			date();
-			break;
-		case ERROR:
-			break;
-		default:
-			break;
+		bool invalid = true;
+		for (int i = 0; i < NB_CMDS; i++) {
+			if (!strcmp(commands[i].name, screen->line)) {
+				commands[i].fn();
+				invalid = false;
+				break;
+			}
 		}
+		if (invalid && screen->line[0])
+			kprintf(0, "invalid command: %s\n", screen->line);
 		memset(screen->line, '\0', sizeof(screen->line));
 	}
 }

src/shell/misc_cmds.c

@@ -0,0 +1,7 @@
+#include "kprintf.h"
+#include "shell.h"
+
+void merdella(void)
+{
+	kprintf(0, POOP);
+}