using GNU readline for history+arrow key handling because i hate

`<termios.h>`

Signed-off-by: czjstmax <jstmaxlol@disroot.org>

2 files changed, 29 insertions, 16 deletions

diff --git a/Makefile b/Makefile
index 88c9e3a..8140274 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 CC      = gcc
 IN      = nm.c
 OUT     = nshm
-LIBS 	= 
+LIBS 	= -lreadline
 OPTS 	= -O0 -g -Wall -Wextra -pedantic
 
 all:
diff --git a/nm.c b/nm.c
index 7d1cf78..47a8215 100644
--- a/nm.c
+++ b/nm.c
@@ -14,32 +14,44 @@
 #include <stdbool.h>
 #include <wordexp.h>
 #include <sys/wait.h>
+#include <readline/readline.h>
+#include <readline/history.h>
 
 void handlecc(int sig);
-void FreeAll(int n);
+void FreeAll();
 
 char *line = NULL;
-size_t len = 0;
 wordexp_t p;
 
 int main(void)
 {
     signal(SIGINT, handlecc);
+    char *USER = getenv("USER");
 
     while (true) {
-        printf("$ ");
-        getline(&line, &len, stdin);
+        char prompt[strlen(USER) + strlen("$ ") + 1];
+        snprintf(prompt, sizeof(prompt), "%s$ ", USER);
 
-        line[strcspn(line, "\n")] = '\0';
+        line = readline(prompt);
 
-        wordexp(line, &p, 0);
+        if (!line)
+            break;
+        if (*line)
+            add_history(line);
 
-        if (strlen(line) == 0) {
-            FreeAll(1);
+        if (wordexp(line, &p, 0) != 0) {
+            fprintf(stderr, "nsh+! parse error\n");
+            free(line);
+            continue;
+        }
+
+        // built-ins
+        if (p.we_wordc == 0) {
+            FreeAll();
             continue;
         }
         if (strcmp(p.we_wordv[0], ":q") == 0 || strcmp(p.we_wordv[0], "exit") == 0) {
-            FreeAll(0);
+            FreeAll();
             return 0;
         }
         else if (strcmp(p.we_wordv[0], "echo") == 0) {
@@ -54,7 +66,7 @@ int main(void)
         else if (strcmp(p.we_wordv[0], "cd") == 0) {
             if (p.we_wordc <= 1) {
                 printf("nsh+! cd: no arguments were given.\n");
-                FreeAll(1);
+                FreeAll();
                 continue;
             }
             if (chdir(p.we_wordv[1]))
@@ -84,7 +96,7 @@ int main(void)
             if (pid == 0) {
                 execvp(p.we_wordv[0], argv);
                 perror("nsh+! ERROR: failed to execvp()");
-                FreeAll(0);
+                FreeAll();
                 _exit(1);
             }
             else if (pid > 0) {
@@ -101,13 +113,14 @@ int main(void)
 void handlecc(int sig)
 {
     printf("\nnsh+! %d caught.\nfreeing stuff before quitting.\n", sig);
-    FreeAll(0);
+    FreeAll();
     exit(0);
 }
 
-void FreeAll(int n)
+void FreeAll()
 {
     wordfree(&p);
-    if (n == 0)
-        free(line);
+    free(line);
+    line = NULL;
 }
+