feat: toujours les mêmes qui font les pipes. Plus de assert dans ASTs (pour des raisons évidentes de stabilité du code) et nouveaux types (AST_PIPE et AST_NEG), + modifs random dans le parser

src/parser/grammar_basic.c

@@ -1,13 +1,13 @@
+#include <stdbool.h>
 #define _POSIX_C_SOURCE 200809L
 
-#include "grammar_basic.h"
-
 #include <stdio.h>
 #include <string.h>
 
 #include "../utils/lists/lists.h"
 #include "grammar.h"
 #include "grammar_advanced.h"
+#include "grammar_basic.h"
 
 // === Static functions
 
@@ -108,7 +108,42 @@ struct ast *parse_and_or(struct lexer_context *ctx)
 
 struct ast *parse_pipeline(struct lexer_context *ctx)
 {
-    return parse_command(ctx);
+    bool negation = false;
+    struct token *token = PEEK_TOKEN();
+
+    // Eventual '!'
+    if (token->type == TOKEN_NEGATION)
+    {
+        negation = true;
+        POP_TOKEN();
+        token = PEEK_TOKEN();
+    }
+
+    // TODO handle negation (new AST type)
+
+    struct ast *left = parse_command(ctx);
+
+    token = PEEK_TOKEN();
+    while (token->type == TOKEN_PIPE)
+    {
+        POP_TOKEN();
+
+        // skip newlines
+        token = PEEK_TOKEN();
+        while (token->type == TOKEN_NEWLINE)
+        {
+            POP_TOKEN();
+            token = PEEK_TOKEN();
+        }
+
+        struct ast *right = parse_command(ctx);
+
+        // Create AST
+        left = ast_create_pipe(left, right);
+        token = PEEK_TOKEN();
+    }
+
+    return left;
 }
 
 struct ast *parse_command(struct lexer_context *ctx)
@@ -125,7 +160,7 @@ struct ast *parse_command(struct lexer_context *ctx)
     }
     else
     {
-        puts("Syntax error: expected command");
+        puts("Syntax error: unexpected token");
         return NULL;
     }
 }
@@ -324,7 +359,7 @@ struct ast *parse_compound_list(struct lexer_context *ctx)
                 return NULL;
             result_list = list_append(result_list, current_cmd);
         }
-        
+
         token = PEEK_TOKEN();
     }