added i32 and i64 support

LICENSE.md

@@ -0,0 +1,19 @@
+# zlib License
+
+(C) 2026 Simon Kellet
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

README.md

@@ -19,8 +19,14 @@ This a very simple implementation of Go-like flags in Odin
 
 	fleg.parse_flags()
 ```
+You can also marks flags as **required**. These will still be parsed, however will hault the application until they are passed:
 
-***Supports: bool, int, string, f32***
+```odin
+	import "fleg"
+	isRunning: bool
+	fleg.BoolVar(&isRunning, "isRunning", true, "A select piece of code is running!", required = true)
+	fleg.parse_flags()
+```
 
 And on the command line, you pass flags like so:
 
@@ -28,9 +34,11 @@ And on the command line, you pass flags like so:
 ./<program name> -isNumber=45 -isRunning=false ......
 ```
 
-## Usage flag: -help
+***Supports: bool, int, string, f32 and f64***
 
-The package also contains a help context menu. This comes default and can be called like so
+## Help flag:
+
+The package also contains a help context menu. This comes default and can be called like so (**Note:** You can also use "-h" or "--help"):
 
 ```txt
 ./<program name> -help
@@ -52,6 +60,23 @@ The package also contains a help context menu. This comes default and can be cal
 
 **Note:** You can set the boolean *FORCE_HELP_ON_EMPTY_ARGS* to allow for the help context menu to be displayed when no arguments are passed
 
+## Custom Flag Format
+
+A custom flag format can be created by overwriting the strings *FLAG_START_CHAR* and *FLAG_SEP_CHAR*. (These *cannot* be the same however!)
+
+```odin
+	fleg.FLAG_START_CHAR = "--"
+	fleg.FLAG_SEP_CHAR = ":"
+```
+
+Flags will now be in the format:
+
+```txt
+	--isString:"......"
+```
+
+**Note:** Any change to the format of the flags is also relfected upon the "help" flag.
+
 ## Custom Allocator
 
 If needed, you are able to setup a custom allocator like so:
@@ -65,4 +90,15 @@ If needed, you are able to setup a custom allocator like so:
 
 	fleg.init_custom_allocator(arena_alloc)
 	defer fleg.destroy() //clean up flags
-```
+```
+
+### Mirror
+
+This repo is being developed on Gitea [here](https://git.simonkellet.xyz/simonkellet/odin-flags). The Github ([here](https://github.com/simonkellet404/odin-flags)) is a mirror.
+
+## TODO
+
+* More type support
+* Better logging of INFO and ERROR's
+* String validation (perhaps not needed?)
+* Array support (e.g. **--isArray:{4,5,6,7}**)

example.odin

@@ -1,6 +1,7 @@
 package main
 
 import "core:fmt"
+import vmem "core:mem/virtual"
 import "fleg"
 
 main :: proc(){
@@ -12,11 +13,12 @@ main :: proc(){
 	defer vmem.arena_destroy(&arena) //clean
 
 	fleg.init_custom_allocator(arena_alloc)
+	defer fleg.destroy()
 	*/
 
-	fleg.FLAG_START_CHAR = "--"
+	fleg.FLAG_START_CHAR = ":"
-	fleg.FLAG_SEP_CHAR = ":"
+	fleg.FLAG_SEP_CHAR = "="
-	fleg.FORCE_HELP_ON_EMPTY_ARGS = true
+	//fleg.FORCE_HELP_ON_EMPTY_ARGS = true
 
 	defer fleg.destroy()
 	isRunning: bool
@@ -24,8 +26,8 @@ main :: proc(){
 	isString: string
 	isFloat: f32
 
-	fleg.BoolVar(&isRunning, "isRunning", true, "A select piece of code is running!")
+	fleg.BoolVar(&isRunning, "isRunning", false, "A select piece of code is running!", required = true)
-	fleg.IntVar(&isNumber, "isNumber", 3434, "A number!")
+	fleg.IntVar(&isNumber, "isNumber", 3434, "A number!", required = true)
 	fleg.StringVar(&isString, "isString", "Hellope!", "A string!")
 	fleg.Float32Var(&isFloat, "isFloat", 3.1415, "A float!")
 	fleg.parse_flags()

fleg/flag.odin

@@ -1,3 +1,25 @@
+/*
+zlib License
+
+(C) 2026 Simon Kellet
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
 #+vet explicit-allocators
 package fleg
 
@@ -11,22 +33,32 @@ FORCE_HELP_ON_EMPTY_ARGS := false
 FLAG_START_CHAR := "-"
 FLAG_SEP_CHAR := "="
 
+@(private)
 Flag_Value_Ptr :: union {
 	^bool,
 	^int,
+	^i32,
+	^i64,
 	^string,
 	^f32,
 	^f64,
 }
 
+@(private)
 Flag :: struct {
 	name:   string,
 	value:  Flag_Value_Ptr,
 	usage:  string,
-	parsed: bool, // sck: flag to check if it has been parsed
+	parsed: bool,   // sck: flag to check if it has been parsed
+	required: bool, // sck: required flag
 }
 
+// Global dynamic array of Flags
+@(private)
 all_flags: [dynamic]Flag
+
+// runtime allocator for the flags
+@(private)
 flag_allocator: runtime.Allocator
 
 // sck: Used to create a customer allocator
@@ -38,78 +70,139 @@ init_custom_allocator :: proc(allocator: runtime.Allocator) {
 }
 
 destroy :: proc() {
+	free_all(flag_allocator)
 	delete(all_flags)
-	all_flags = {} // sck: needed?
+	all_flags = {}
 }
 
+@(private)
 print_flags :: proc() {
 	for f in all_flags {
-		fmt.printfln("%s: %v: %s", f.name, f.value, f.usage)
+		fmt.printfln("%s: %s (required=%v)", f.name, f.usage, f.required)
 	}
 }
 
+@(private)
+print_flag_format :: proc(){
+	fmt.printfln("Want %s<flag>%s<value>\n", FLAG_START_CHAR, FLAG_SEP_CHAR)
+}
+
+@(private)
 print_usage :: proc() {
 	fmt.println("\tUsage: ")
 	fmt.println("\n\tFlag format for this program:")
 	fmt.printfln("\t%s<flag>%s<value>\n", FLAG_START_CHAR, FLAG_SEP_CHAR)
+
 	for f in all_flags {
+		req_msg: string
+		if f.required { req_msg = " (required)"}
 		switch v in f.value {
 		case ^bool:
-			fmt.printfln("\t%s%s:\n\t\t%s (default: %v)\n", FLAG_START_CHAR, f.name, f.usage, v^)
+			fmt.printfln("\t%s%s:\n\t\t%s (default: %v)%s\n", FLAG_START_CHAR, f.name, f.usage, v^, req_msg)
 		case ^int:
-			fmt.printfln("\t%s%s:\n\t\t%s (default: %d)\n", FLAG_START_CHAR, f.name, f.usage, v^)
+			fmt.printfln("\t%s%s:\n\t\t%s (default: %d)%s\n", FLAG_START_CHAR, f.name, f.usage, v^, req_msg)
+		case ^i32:
+			fmt.printfln("\t%s%s:\n\t\t%s (default: %d)%s\n", FLAG_START_CHAR, f.name, f.usage, v^, req_msg)
+		case ^i64:
+			fmt.printfln("\t%s%s:\n\t\t%s (default: %d)%s\n", FLAG_START_CHAR, f.name, f.usage, v^, req_msg)
 		case ^string:
-			fmt.printfln("\t%s%s:\n\t\t%s (default: %s)\n", FLAG_START_CHAR, f.name, f.usage, v^)
+			fmt.printfln("\t%s%s:\n\t\t%s (default: %s)%s\n", FLAG_START_CHAR, f.name, f.usage, v^, req_msg)
 		case ^f32:
-			fmt.printfln("\t%s%s:\n\t\t%s (default: %f)\n", FLAG_START_CHAR, f.name, f.usage, v^)
+			fmt.printfln("\t%s%s:\n\t\t%s (default: %f)%s\n", FLAG_START_CHAR, f.name, f.usage, v^, req_msg)
 		case ^f64:
-			fmt.printfln("\t%s%s:\n\t\t%s (default: %f)\n", FLAG_START_CHAR, f.name, f.usage, v^)
+			fmt.printfln("\t%s%s:\n\t\t%s (default: %f)%s\n", FLAG_START_CHAR, f.name, f.usage, v^, req_msg)
 		}
 	}
-	os.exit(0)
 }
 
-BoolVar :: proc(ptr: ^bool, name: string, default: bool, usage: string) {
+BoolVar :: proc(ptr: ^bool, name: string, default: bool, usage: string, required := false) {
+	if ptr == nil {
+		fmt.fprintfln(os.stderr, "[ERROR]: Invalid usage of BoolVar: got nil for 'ptr' value!")
+		os.exit(1)
+	}
 	ptr^ = default
-	append(&all_flags, Flag{name = name, value = ptr, usage = usage})
+	append(&all_flags, Flag{name = name, value = ptr, usage = usage, required = required})
 }
 
-IntVar :: proc(ptr: ^int, name: string, default: int, usage: string) {
+IntVar :: proc(ptr: ^int, name: string, default: int, usage: string, required := false) {
+	if ptr == nil {
+		fmt.fprintfln(os.stderr, "[ERROR]: Invalid usage of IntVar: got nil for 'ptr' value!")
+		os.exit(1)
+	}
 	ptr^ = default
-	append(&all_flags, Flag{name = name, value = ptr, usage = usage})
+	append(&all_flags, Flag{name = name, value = ptr, usage = usage, required = required})
 }
 
-StringVar :: proc(ptr: ^string, name: string, default: string, usage: string) {
+Int32Var :: proc(ptr: ^i32, name: string, default: i32, usage: string, required := false) {
+	if ptr == nil {
+		fmt.fprintfln(os.stderr, "[ERROR]: Invalid usage of Int32Var: got nil for 'ptr' value!")
+		os.exit(1)
+	}
 	ptr^ = default
-	append(&all_flags, Flag{name = name, value = ptr, usage = usage})
+	append(&all_flags, Flag{name = name, value = ptr, usage = usage, required = required})
 }
 
-Float32Var :: proc(ptr: ^f32, name: string, default: f32, usage: string) {
+Int64Var :: proc(ptr: ^i64, name: string, default: i64, usage: string, required := false) {
+	if ptr == nil {
+		fmt.fprintfln(os.stderr, "[ERROR]: Invalid usage of Int32Var: got nil for 'ptr' value!")
+		os.exit(1)
+	}
 	ptr^ = default
-	append(&all_flags, Flag{name = name, value = ptr, usage = usage})
+	append(&all_flags, Flag{name = name, value = ptr, usage = usage, required = required})
 }
 
-Float64Var :: proc(ptr: ^f64, name: string, default: f64, usage: string) {
+StringVar :: proc(ptr: ^string, name: string, default: string, usage: string, required := false) {
+	if ptr == nil {
+		fmt.fprintfln(os.stderr, "[ERROR]: Invalid usage of StringVar: got nil for 'ptr' value!")
+		os.exit(1)
+	}
 	ptr^ = default
-	append(&all_flags, Flag{name = name, value = ptr, usage = usage})
+	append(&all_flags, Flag{name = name, value = ptr, usage = usage, required = required})
+}
+
+Float32Var :: proc(ptr: ^f32, name: string, default: f32, usage: string, required := false) {
+	if ptr == nil {
+		fmt.fprintfln(os.stderr, "[ERROR]: Invalid usage of Float32Var: got nil for 'ptr' value!")
+		os.exit(1)
+	}
+	ptr^ = default
+	append(&all_flags, Flag{name = name, value = ptr, usage = usage, required = required})
+}
+
+Float64Var :: proc(ptr: ^f64, name: string, default: f64, usage: string, required := false) {
+	if ptr == nil {
+		fmt.fprintfln(os.stderr, "[ERROR]: Invalid usage of Float64Var: got nil for 'ptr' value!")
+		os.exit(1)
+	}
+	ptr^ = default
+	append(&all_flags, Flag{name = name, value = ptr, usage = usage, required = required})
 }
 
 parse_flags :: proc() {
+	// sck: We cannot have the start and seperator formats being the same
+	if FLAG_START_CHAR == FLAG_SEP_CHAR {
+		fmt.fprintfln(os.stderr, "[ERROR]: FLAG_START_CHAR and FLAG_SEP_CHAR cannot be the same!")
+		fmt.printfln("\t FLAG_START_CHAR= \"%s\"\t FLAG_SEP_CHAR= \"%s\"", FLAG_START_CHAR, FLAG_SEP_CHAR)
+		os.exit(1)
+	}
 	if len(os.args) < 2 && FORCE_HELP_ON_EMPTY_ARGS {print_usage()}
 
-	for &a in os.args {
+	// skip the first arg (1:)
-		if a == "-h" || a == "-help" || a == "--help" {print_usage()}
+	for &a in os.args[1:] {
-		if a == os.args[0] {continue}
+		if a == "-h" || a == "-help" || a == "--help" {print_usage(); os.exit(0)}
+		// sck: if the user has a custom flag format, copy that to the help flag too.
+		if a == fmt.aprintf("%s%s", FLAG_START_CHAR, "help", allocator = context.temp_allocator) {print_usage(); os.exit(0)}
+		if a == fmt.aprintf("%s%s", FLAG_START_CHAR, "h", allocator = context.temp_allocator) {print_usage(); os.exit(0)}
+		defer free_all(context.temp_allocator) //clean up!
 
+		// Begin parsing flags...
 		for &f in all_flags {
 			if f.parsed {continue}
-			//a = strings.trim_prefix(a, "-")
-			a = strings.trim_prefix(a, FLAG_START_CHAR)
 
+			a = strings.trim_prefix(a, FLAG_START_CHAR)
 			name := a
 			value: string
 
-			//split := strings.index_any(a, "=")
 			split := strings.index_any(a, FLAG_SEP_CHAR)
 			if split >= 0 {
 				name = a[:split]
@@ -117,10 +210,11 @@ parse_flags :: proc() {
 			} else {
 				name = a
 				fmt.printf("[INFO]: Could not read flag: %s. ", name)
-				fmt.printfln("Want %s<flag>%s<value>\n", FLAG_START_CHAR, FLAG_SEP_CHAR)
+				print_flag_format()
 				break
 			}
 
+			// sck: We are going to parse all the flags
 			if name == f.name && !f.parsed {
 				f.parsed = true
 				switch &v in f.value {
@@ -144,6 +238,26 @@ parse_flags :: proc() {
 					}
 					v^ = parsed
 
+				case ^i32:
+					if value == "" {break}
+					parsed, ok := strconv.parse_int(value)
+					if !ok {
+						fmt.fprintfln(os.stderr, "[ERROR] Failed to parse flag %s: got %T, wanted int",
+							f.name, value)
+						os.exit(1)
+					}
+					v^ = cast(i32)parsed
+
+				case ^i64:
+					if value == "" {break}
+					parsed, ok := strconv.parse_i64(value)
+					if !ok {
+						fmt.fprintfln(os.stderr, "[ERROR] Failed to parse flag %s: got %T, wanted int",
+							f.name, value)
+						os.exit(1)
+					}
+					v^ = parsed
+
 				case ^string:
 					if value == "" {break}
 					// TODO: validate string?
@@ -172,4 +286,13 @@ parse_flags :: proc() {
 			}
 		}
 	}
+
+	for f in all_flags {
+	   if f.required && !f.parsed {
+	   	// sck: INFO or ERROR?
+	   	fmt.fprintfln(os.stderr, "[INFO] Missing required flag: %s%s", FLAG_START_CHAR, f.name)
+	   	if !FORCE_HELP_ON_EMPTY_ARGS {fmt.fprintfln(os.stderr, "use -help or -h to view all flags")}
+	      os.exit(1)
+	    }
+	 }
 }