initial implementation for 'or' flag

man/mkwin.1

@@ -10,6 +10,7 @@
 .Op Fl -find Ar root
 .Op Fl -pc Ar flags
 .Ar target
+.Op Fl -or Ar alt
 .Op Ar --\ args
 .Sh DESCRIPTION
 The
@@ -29,6 +30,8 @@ The resulting script will locate the target binary in the given directory using
 .Xr find 1 .
 .It Fl h , Fl -help
 Print a short help message.
+.It Fl -or Ar fallback
+The resulting script will fall back to the provided argument if the target is not executable.
 .It Fl -pc Ar flags
 The resulting script will pass the arguments converted with
 .Xr path-convert 1 . path-convert will be invoked with the provided flags forwarded (use 'x' to forward no flags).

mkwin/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mkwin"
-version = "0.1.1"
+version = "0.2.0"
 edition = "2021"
 
 [dependencies]

mkwin/src/error.rs

@@ -3,13 +3,13 @@
 use std::process::exit;
 
 ///	no argument for target; code 1
-pub fn missing_target() {
+pub fn missing_target() -> ! {
 	eprintln!("mkwin: missing target");
 	exit(1);
 }
 
 ///	failed to canonicalize target path; code 2
-pub fn canonicalize_fail(target: String) {
+pub fn canonicalize_fail(target: String) -> ! {
 	eprintln!("mkwin: failed to canonicalze '{target}'--does the file exist?");
 	exit(2);
 }

mkwin/src/flag.rs

@@ -4,6 +4,7 @@ pub const HELP:			[&str;2]	= ["-h", "--help"];
 pub const EMPTY:		[&str;2]	= ["-e", "--empty"];
 pub const ENV_SHARE:	[&str;2]	= ["-E", "--env-share"];
 pub const FIND_BIN:		&str		= "--find";
+pub const OR:			&str		= "--or";
 pub const PATH_CONVERT:	&str		= "--pc";
 pub const QUIET:		[&str;2]	= ["-q", "--quiet"];
 

mkwin/src/main.rs

@@ -66,29 +66,30 @@ pub fn main() {
 	//	get target executable
 	let target: String;
 	if let Ok(Some(arg)) = args.subcommand() {
-		if let Some(root) = find_bin {	//	handle find binary flag
-			target = format!("target=`find {root} -name '{arg}'`\n\"$target\"");
+		if let Some(root) = &find_bin {	//	handle find binary flag
+			target = format!("`find {root} -name '{arg}'`");
 		} else {						//	handle normal path
 			let path = Path::new(&arg);
 			if let Ok(path) = path.canonicalize() {
 				let path: String = path.to_string_lossy().into();
 				target = format!("'{path}'");
-			} else {
-				error::canonicalize_fail(arg);
-				return;
-			}
-		}
-	} else {
-		error::missing_target();
-		return;
+			} else { error::canonicalize_fail(arg); }
 		}
+	} else { error::missing_target(); }
+	
+	let exec =
+		if let Ok(alt) = args.value_from_str::<&str, String>(flag::OR) {
+			format!("target={target}\nif [ ! -x \"$target\" ]; then\n\ttarget='{alt}'\nfi\n\n\"$target\"")
+		} else if find_bin.is_some() {
+			format!("\"{target}\"")
+		} else { target };
 
 	//	construct output
 	println!("#!/usr/bin/bash\n# generated with: mkwin{arg_string}\n");
 
 	if env_share { println!("env-share 2> /dev/null\n"); }
 
-	print!("{target}");
+	print!("{exec}");
 
 	//	handle forwarded arguments
 	if !forwarded.is_empty() {

scripts/pwsh.sh

@@ -1,18 +1,11 @@
 #!/usr/bin/bash
+# generated with: mkwin /mnt/c/Program Files/PowerShell/7/pwsh.exe -E --or /mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe
 
 env-share 2> /dev/null
 
-#	try to use system-wide version first.
-PWSH='/mnt/c/Program Files/PowerShell/7/pwsh.exe'
-if [ ! -x "$PWSH" ]; then
-	unset PWSH
+target='/mnt/c/Program Files/PowerShell/7/pwsh.exe'
+if [ ! -x "$target" ]; then
+	target='/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe'
 fi
 
-#	fall back to System32
-if [ -z ${PWSH+x} ]; then
-	PWSH='/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe'
-fi
-
-#	run target
-"$PWSH" $@
-
+"$target" $@