style: Use clang-format as formatter and linter tool

We want to keep the code style consistent, this first commit adds a
.clang-format in order to "document" our style code.

This patch also adds a target *linter* to Makefile which will complain
if we have any style issue on test and src dirs.

I have run the follow command to create the .clang-format file:

        $ clang-format -style=mozilla -dump-config > .clang-format

And I also made some adjusts to .clang-format changing the following
properties:

        PointerAlignment: Right
        ColumnLimit:     120

Commands executed to fix the current styling:

        $ find . -name *.h | xargs clang-format -i
        $ find . -name *.c | xargs clang-format -i

Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>

1 files changed, 36 insertions, 34 deletions

diff --git a/src/gas_assembly_generator.c b/src/gas_assembly_generator.c
index 5572cb7..00897fd 100644
--- a/src/gas_assembly_generator.c
+++ b/src/gas_assembly_generator.c
@@ -1,40 +1,42 @@
 /*
-* Copyright (C) 2023 Johnny Richard
-*
-* This program is free software: you can redistribute it and/or modify
-* it under the terms of the GNU General Public License as published by
-* the Free Software Foundation, either version 3 of the License, or
-* (at your option) any later version.
-*
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-* GNU General Public License for more details.
-*
-* You should have received a copy of the GNU General Public License
-* along with this program.  If not, see <https://www.gnu.org/licenses/>.
-*/
+ * Copyright (C) 2023 Johnny Richard
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
 #include "gas_assembly_generator.h"
 
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
 
-static void gas_assembly_generator_visit_function(ast_visitor_t *visitor, ast_function_declaration_t *func);
-static void gas_assembly_generator_visit_return_stmt(ast_visitor_t *visitor, ast_return_stmt_t *return_stmt);
-static void gas_assembly_generator_visit_literal(ast_visitor_t *visitor, ast_literal_t *literal);
-static void gas_assembly_generator_binary_operation(ast_visitor_t *visitor, ast_binary_operation_t *binary_operation);
+static void
+gas_assembly_generator_visit_function(ast_visitor_t *visitor, ast_function_declaration_t *func);
+static void
+gas_assembly_generator_visit_return_stmt(ast_visitor_t *visitor, ast_return_stmt_t *return_stmt);
+static void
+gas_assembly_generator_visit_literal(ast_visitor_t *visitor, ast_literal_t *literal);
+static void
+gas_assembly_generator_binary_operation(ast_visitor_t *visitor, ast_binary_operation_t *binary_operation);
 
 void
 gas_assembly_generator_init(gas_assembly_generator_t *gen, FILE *out)
 {
   assert(gen && out);
-  gen->super = (ast_visitor_t) {
-    .visit_function = &gas_assembly_generator_visit_function,
-    .visit_literal = &gas_assembly_generator_visit_literal,
-    .visit_return_stmt = &gas_assembly_generator_visit_return_stmt,
-    .visit_binary_operation = &gas_assembly_generator_binary_operation
-  };
+  gen->super = (ast_visitor_t){ .visit_function = &gas_assembly_generator_visit_function,
+                                .visit_literal = &gas_assembly_generator_visit_literal,
+                                .visit_return_stmt = &gas_assembly_generator_visit_return_stmt,
+                                .visit_binary_operation = &gas_assembly_generator_binary_operation };
   gen->out = out;
 }
 
@@ -48,13 +50,13 @@ gas_assembly_generator_visit_function(ast_visitor_t *visitor, ast_function_decla
     exit(EXIT_FAILURE);
   }
 
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *) visitor;
+  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
 
-  fprintf(gen->out,".global _start\n");
-  fprintf(gen->out,".text\n");
-  fprintf(gen->out,"_start:\n");
+  fprintf(gen->out, ".global _start\n");
+  fprintf(gen->out, ".text\n");
+  fprintf(gen->out, "_start:\n");
 
-  for (size_t i=0; i < func->body->size; i++) {
+  for (size_t i = 0; i < func->body->size; i++) {
     ast_visitor_visit(visitor, vector_at(func->body, i));
   }
 }
@@ -63,7 +65,7 @@ static void
 gas_assembly_generator_visit_return_stmt(ast_visitor_t *visitor, ast_return_stmt_t *return_stmt)
 {
   assert(visitor && return_stmt);
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *) visitor;
+  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
 
   ast_visitor_visit(visitor, return_stmt->argument);
 
@@ -75,7 +77,7 @@ gas_assembly_generator_visit_return_stmt(ast_visitor_t *visitor, ast_return_stmt
 static void
 gas_assembly_generator_visit_literal(ast_visitor_t *visitor, ast_literal_t *literal)
 {
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *) visitor;
+  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
   switch (literal->kind) {
     case AST_LITERAL_INTEGER:
       fprintf(gen->out, "  mov $%d, %%rax\n", literal->value.integer);
@@ -88,7 +90,7 @@ gas_assembly_generator_visit_literal(ast_visitor_t *visitor, ast_literal_t *lite
 static void
 gas_assembly_generator_binary_operation(ast_visitor_t *visitor, ast_binary_operation_t *binary_operation)
 {
-  gas_assembly_generator_t *gen = (gas_assembly_generator_t *) visitor;
+  gas_assembly_generator_t *gen = (gas_assembly_generator_t *)visitor;
 
   ast_visitor_visit(visitor, binary_operation->right);
 
@@ -119,6 +121,6 @@ gas_assembly_generator_binary_operation(ast_visitor_t *visitor, ast_binary_opera
     return;
   }
 
-  fprintf(stderr, "no strategy defined for: "SVFMT"\n", SVARG(&binary_operation->op));
+  fprintf(stderr, "no strategy defined for: " SVFMT "\n", SVARG(&binary_operation->op));
   assert(false);
 }