if one liners working, need to check the syntax of the expression though, will do later

Makefile

@@ -27,6 +27,8 @@ SRC = src/shell.c \
 	src/builtin/builtin_alias.c \
 	src/builtin/builtin_unalias.c \
 	src/builtin/builtin_echo.c \
+	src/builtin/builtin_if.c \
+	src/builtin/builtin_if_two.c \
 	src/signal.c \
 	src/free_env.c \
 	src/utility/same_var.c \

include/builtin.h

@@ -29,6 +29,7 @@ int builtin_history(char **args, env_t *env);
 int builtin_alias(char **args, env_t *env);
 int builtin_unalias(char **args, env_t *env);
 int builtin_echo(char **args, env_t *env);
+int builtin_if(char **argv, env_t *env);
 //utility
 bool find_path_in_builtins(char *cmd);
 char **get_envpath(env_t *env);
@@ -58,4 +59,9 @@ int add_alias_to_list(alias_t **list, alias_t *elem, char *alias);
 void remove_alias(char *alias, alias_t **list);
 
 //echo
-int print_char(char *str, int i);
+int print_char(char *str, int i);
+
+//if
+
+int get_test_return_value(char **argv, env_t *env);
+int get_max_cmd_len(char **argv);

src/builtin/builtin_if.c

@@ -0,0 +1,77 @@
+/*
+** EPITECH PROJECT, 2020
+** 42sh
+** File description:
+** if builtin
+*/
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "shell.h"
+#include "builtin.h"
+
+int get_max_cmd_len(char **argv)
+{
+    int len = 0;
+
+    for (int i = 0; argv[i]; i++) {
+        if (i)
+            len++;
+        for (int j = 0; argv[i][j]; j++)
+            len++;
+    }
+    return (len);
+}
+
+int execute_one_liner(char **argv, env_t *env)
+{
+    bool after_exp = false;
+    char *cmd = malloc(sizeof(char) * get_max_cmd_len(argv));
+    int counter = 0;
+
+    if (!cmd || get_test_return_value(argv, env))
+        return (0);
+    for (int i = 0; argv[i]; i++) {
+        for (int j = 0; argv[i][j]; j++) {
+            if (after_exp)
+                cmd[counter++] = argv[i][j];
+            if (argv[i][j] == ')')
+                after_exp = true;
+        }
+        if (after_exp && counter)
+            cmd[counter++] = ' ';
+    }
+    cmd[counter] = 0;
+    eval_raw_cmd(cmd, env);
+    free(cmd);
+    return (0);
+}
+
+int is_valid_expression(char **argv)
+{
+    int len = 0;
+
+    for (; argv[len]; len++);
+    if (len < 1)
+        return (0);
+    if (argv[1][0] != '(')
+        return (0);
+    for (int i = 1; argv[i]; i++)
+        for (int j = 0; argv[i][j]; j++)
+            if (argv[i][j] == ')')
+                return (1);
+    return (0);
+}
+
+int builtin_if(char **argv, env_t *env)
+{
+    if (is_valid_expression(argv)) {
+        execute_one_liner(argv, env);
+    } else {
+        printf("if: Expression Syntax.\n");
+        fflush(stdout);
+        env->vars = my_setenv(env->vars, "?", "1");
+    }
+    return (0);
+}

src/builtin/builtin_if_two.c

@@ -0,0 +1,46 @@
+/*
+** EPITECH PROJECT, 2020
+** 42sh
+** File description:
+** builtin_if_two
+*/
+
+#include <string.h>
+#include <stdlib.h>
+#include "shell.h"
+#include "builtin.h"
+
+char *get_expr(char **argv)
+{
+    bool in_expr = false;
+    char *res = malloc(sizeof(char) * get_max_cmd_len(argv) + 5);
+    int counter = 5;
+
+    if (!res) return (NULL);
+    strcpy(res, "test ");
+    for (int i = 0; argv[i]; i++) {
+        for (int j = 0; argv[i][j]; j++) {
+            if (argv[i][j] == ')')
+                in_expr = false;
+            if (in_expr)
+                res[counter++] = argv[i][j];
+            if (argv[i][j] == '(')
+                in_expr = true;
+        }
+        if (in_expr && counter)
+            res[counter++] = ' ';
+    }
+    res[counter] = 0;
+    return (res);
+}
+
+int get_test_return_value(char **argv, env_t *env)
+{
+    int res = 0;
+    char *exp = get_expr(argv);
+
+    eval_raw_cmd(exp, env);
+    res = my_getenv(env->vars, "?") ? atoi(my_getenv(env->vars, "?")) : 1;
+    free(exp);
+    return (res);
+}

src/env.c

@@ -10,7 +10,6 @@
 #include <string.h>
 #include "utility.h"
 
-
 char *my_getenv(char **env, char *name)
 {
     if (!env)

src/key_bindings/basic_typing_functions.c

@@ -58,7 +58,7 @@ int delete_char_command(int key, buffer_t *buffer, env_t *env)
 
 int newline_command(int key, buffer_t *buffer, env_t *env)
 {
-    int ret;
+    int ret = 0;
 
     env->vars = my_unsetenv(env->vars, "eof");
     if (env->window)

src/prompt.c

@@ -28,6 +28,7 @@ const builtin builtins[] = {
     {"alias", &builtin_alias},
     {"unalias", &builtin_unalias},
     {"echo", &builtin_echo},
+    {"if", &builtin_if},
     {NULL, NULL}
 };