Add initial amount of flags

Author: PucklaJ

runic.odin

@@ -18,6 +18,7 @@ along with runic.  If not, see <http://www.gnu.org/licenses/>.
 package main
 
 import ccdg "c/codegen"
+import "core:flags"
 import "core:fmt"
 import "core:os"
 import "core:path/filepath"
@@ -42,13 +43,72 @@ main :: proc() {
     defer free_all(context.temp_allocator)
     defer free_all(errors.error_allocator)
 
-    rune_file_name := "./rune.yml"
-    host_plat := runic.platform_from_host()
+    args: struct {
+        version:
+        bool `args:"name=version" usage:"Print version and license information"`,
+        credits:
+        bool `args:"name=credits" usage:"Print credits to dependencies"`,
+        rune_file_name:
+        string `args:"pos=0,name=rune" usage:"The rune configuration file to load"`,
+    }
+
+    if flags_err := flags.parse(&args, os.args[1:], .Unix); flags_err != nil {
+        switch e in flags_err {
+        case flags.Parse_Error:
+            fmt.eprintfln("{}: {}", e.reason, e.message)
+            os.exit(1)
+        case flags.Open_File_Error:
+            fmt.eprintfln("open file \"{}\": {}", e.filename, e.errno)
+            os.exit(1)
+        case flags.Help_Request:
+            flags.write_usage(
+                os.stream_from_handle(os.stderr),
+                any(args).id,
+                os.args[0],
+                .Unix,
+            )
+            os.exit(0)
+        case flags.Validation_Error:
+            fmt.eprintfln("validate flags: {}", e.message)
+            os.exit(1)
+        }
+
+        panic("unreachable")
+    }
+
+    if args.version {
+        print_version()
+        os.exit(0)
+    } else if args.credits {
+        print_credits()
+        os.exit(0)
+    }
 
-    if len(os.args) > 1 {
-        rune_file_name = os.args[1]
+    rune_file_name := args.rune_file_name
+    if len(rune_file_name) == 0 {
+        canditates := [?]string{"rune.yml", "rune.yaml", "rune.json"}
+
+        for c in canditates {
+            if os.is_file(c) {
+                rune_file_name = c
+            }
+        }
+
+        if len(rune_file_name) == 0 {
+            fmt.eprintfln(
+                "no rune file has been specified and no rune file has been found in the current working directory\ncandiates are {}",
+                strings.join(
+                    canditates[:],
+                    ", ",
+                    allocator = context.temp_allocator,
+                ),
+            )
+            os.exit(1)
+        }
     }
 
+    host_plat := runic.platform_from_host()
+
     if !filepath.is_abs(rune_file_name) {
         cwd := os.get_current_directory()
         defer delete(cwd)
@@ -468,4 +528,3 @@ main :: proc() {
         }
     }
 }
-

version.odin

@@ -0,0 +1,76 @@
+/*
+This file is part of runic.
+
+Runic is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License version 2
+as published by the Free Software Foundation.
+
+Runic 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 runic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+package main
+
+import "core:fmt"
+
+VERSION_MAJOR :: 0
+VERSION_MINOR :: 6
+
+print_version :: #force_inline proc() {
+    fmt.printfln(
+        `runic {}.{}
+Runic is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License version 2
+as published by the Free Software Foundation.
+
+Runic 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.`,
+        VERSION_MAJOR,
+        VERSION_MINOR,
+    )
+}
+
+print_credits :: #force_inline proc() {
+    fmt.println(
+        `Runic was able to be made thanks to other free and open source software:
+
+--------------- libclang ------------------
+Part of the LLVM Project, under the Apache License v2.0 with LLVM
+Exceptions.
+See https://llvm.org/LICENSE.txt for license information.
+SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+--------------- libclang ------------------
+
+--------------- libyaml -------------------
+Copyright (c) 2017-2020 Ingy döt Net
+Copyright (c) 2006-2016 Kirill Simonov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+--------------- libyaml -------------------
+`,
+    )
+}