>> remove more complex whitespace behaviour form tests

> make restrictRuneset pass tests

Makefile

@@ -5,4 +5,6 @@ owl: ${SOURCES}
 owl.1: man.md
 	pandoc -s --shift-heading-level-by=-1 --to=man man.md > owl.1
 build: owl owl.1
-.PHONY: build
+test: *.go
+	go test -v .
+.PHONY: build test

main.go

@@ -91,13 +91,16 @@ func restrictRuneset(s, strategy string) string {
 	} else {
 		for _, r := range result {
 			if !isFatValid(r) {
-				toValidSubs[r] = fmt.Sprintf("_U%d_", r)
+				toValidSubs[r] = fmt.Sprintf("_U%X_", r)
 			}
 		}
 	}
 	for old, new := range toValidSubs {
 		result = strings.ReplaceAll(result, string(old), new)
 	}
+	if len(result) == 0 {
+		return "_EMPTY_"
+	}
 	return result
 }
 
@@ -159,7 +162,7 @@ func parseCLIArgs(args []string) (context, error) {
 
 // TODO: Finish writing options short help. Mention man page where relevant.
 func printHelp() {
-	fmt.Println(`Owl - a hunter of bad characters in filenames
+	fmt.Print(`Owl - a hunter of bad characters in filenames
 
  Usage:
    owl [options] FILES
@@ -172,6 +175,7 @@ func printHelp() {
    -h,--help
    -v,--version
    -d,--directory DIRECTORY
+
 `);
 }
 

man.md

@@ -9,39 +9,27 @@ not compatible with `FAT` file systems (typically `FAT32` or `exFAT`).
 owl COMMAND OPTIONS FILE1 FILE2 ...
 ```
 
-
-## CLEAN COMMAND
 Rename `FILE`s given at the command line such that all `FAT`-incompatible 
 characters are removed. By default it replaces invalid characters with 
 `_U{Unicode Code Point}_`, but this can be changed, see the `--strategy` 
 flag below.
 
-## Options:
 
+## Options:
 ### -s, --strategy STRATEGY
 Change what happens to invalid characters. Choices are:
 
 - "remove": just remove the characters. If left with an empty string, rename 
   to "\_empty_".
-- "code-point": replace each character with "\_Unum_", where "num" is the 
+- "represent": replace each character with "\_Unum_", where "num" is the 
   Unicode Code Point of the character.
 
-## HELP COMMAND
-Show a small help message.
-
-## VERSION COMMAND
-Show version information.
-
-
-## GENERAL OPTIONS
 ### -n, --dry-run
 Causes Owl to just print a representation of what would be done without 
 actually renaming any files.
 
 ### -v, --version
-Causes the `version` command to be run, regardless of what other arguments 
-are given.
+Show version information.
 
 ### -h, --help
-Causes the `help` command to be run, regardless of what other arguments are 
-given.
+Show a small help message.