v test v => v test-compiler

vlib/flag/flag.v

@@ -45,7 +45,7 @@ module flag
 //  ```
 
 // data object storing information about a defined flag
-struct Flag {
+pub struct Flag {
 pub:
   name     string // name as it appears on command line
   abbr     byte   // shortcut
@@ -55,7 +55,7 @@ pub:
 }
 
 // 
-struct FlagParser {
+pub struct FlagParser {
 pub mut: 
   args  []string                  // the arguments to be parsed
   flags []Flag                    // registered flags
@@ -69,7 +69,7 @@ pub mut:
   args_description        string
 }
 
-const (
+pub const (
   // used for formating usage message
   SPACE = '                            '
   UNDERLINE = '-----------------------------------------------'
@@ -125,14 +125,13 @@ fn (fs mut FlagParser) parse_value(n string, ab byte) ?string {
   c := '--$n'
   for i, a in fs.args {
     if a == c || (a.len == 2 && a[1] == ab) {
-      if fs.args.len > i+1 && fs.args[i+1].left(2) != '--' {
-        val := fs.args[i+1]
-        fs.args.delete(i+1)
-        fs.args.delete(i)
-        return val
-      } else {
-        panic('Missing argument for \'$n\'')
-      }
+      if i+1 > fs.args.len { panic('Missing argument for \'$n\'') }
+      nextarg := fs.args[i+1]
+      if nextarg.limit(2) == '--' { panic('Missing argument for \'$n\'') }
+      val := fs.args[i+1]
+      fs.args.delete(i+1)
+      fs.args.delete(i)
+      return val
     } else if a.len > c.len && c == a[..c.len] && a[c.len..c.len+1] == '=' {
       val := a[c.len+1..]
       fs.args.delete(i)

vlib/flag/flag_test.v

@@ -247,3 +247,20 @@ fn test_allow_abreviations() {
   u := fp.usage()
   assert u.contains(' -v') && u.contains(' -o') && u.contains(' -i') && u.contains(' -f')
 }
+
+fn test_allow_kebab_options() {
+  default_value := 'this_is_the_default_value_of_long_option'
+  long_option_value := 'this_is_a_long_option_value_as_argument'
+  
+  mut fp := flag.new_flag_parser(['--my-long-flag', 'true', '--my-long-option', long_option_value ])
+
+  my_flag   := fp.bool('my-long-flag',     false,         'flag with long-kebab-name')
+  my_option := fp.string('my-long-option', default_value, 'string with long-kebab-name')
+ 
+  assert my_flag == true
+  assert my_option == long_option_value
+
+  u := fp.usage()
+  assert u.contains(' --my-long-flag')
+  assert u.contains(' --my-long-option')
+}