Avoid assuming POSIX shell semantics

The || operator is not available on all shells, e.g. not with nushell.

Fixes #15

Author: vimpostor

autoload/lumen/debug.vim

@@ -3,7 +3,7 @@ let s:stderr = []
 func lumen#debug#info()
 	let job_state = lumen#job_state()
 	let platform = lumen#platforms#platform()
-	return {'platform': platform, 'job_state': job_state, 'job_errors': s:stderr}
+	return {'platform': platform, 'job_state': job_state, 'job_errors': s:stderr, 'shell': &shell}
 endfunc
 
 func lumen#debug#log_err(line)

autoload/lumen/platforms/macos.vim

@@ -13,9 +13,10 @@ func lumen#platforms#macos#parse_line(line)
 endfunc
 
 func lumen#platforms#macos#oneshot()
-	silent let out = get(systemlist(printf("%s get || swiftc %s.swift -o %s", s:exe, s:exe, s:exe)), 0)
+	silent let out = get(systemlist(printf("%s get", s:exe)), 0)
 	if len(out) != 5
 		let err = out
+		silent let compile = system(printf("swiftc %s.swift -o %s", s:exe, s:exe))
 		" fallback
 		silent let out = get(systemlist(s:exe . ".swift get"), 0)
 	endif
@@ -24,6 +25,7 @@ func lumen#platforms#macos#oneshot()
 		call lumen#platforms#macos#parse_line(out)
 	else
 		call lumen#debug#log_err(err)
+		call lumen#debug#log_err(compile)
 		call lumen#debug#log_err(out)
 	endif
 endfunc

autoload/lumen/platforms/macos/watcher.swift

@@ -5,7 +5,7 @@
 import Cocoa
 import Darwin
 
-setbuf(stdout, nil); // don't buffer the output. thats why print() didn't work.
+setbuf(stdout, nil); // don't buffer the output
 
 var isAppearanceDark: Bool {
 	if #available(macOS 11.0, *) {