lib/core: add optional char parameter to `Text::justify`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/core/text/abstract_text.nit b/lib/core/text/abstract_text.nit
index 859808a..b38eb27 100644 (file)
--- a/lib/core/text/abstract_text.nit
+++ b/lib/core/text/abstract_text.nit
@@ -495,18 +495,21 @@ abstract class Text
                end
        end
 
-       # Justify a self in a space of `length`
+       # Justify `self` in a space of `length`
        #
        # `left` is the space ratio on the left side.
        # * 0.0 for left-justified (no space at the left)
        # * 1.0 for right-justified (all spaces at the left)
        # * 0.5 for centered (half the spaces at the left)
        #
+       # `char`, or `' '` by default, is repeated to pad the empty space.
+       #
        # Examples
        #
        #     assert "hello".justify(10, 0.0)  == "hello     "
        #     assert "hello".justify(10, 1.0)  == "     hello"
        #     assert "hello".justify(10, 0.5)  == "  hello   "
+       #     assert "hello".justify(10, 0.5, '.') == "..hello..."
        #
        # If `length` is not enough, `self` is returned as is.
        #
@@ -515,13 +518,14 @@ abstract class Text
        # REQUIRE: `left >= 0.0 and left <= 1.0`
        # ENSURE: `self.length <= length implies result.length == length`
        # ENSURE: `self.length >= length implies result == self`
-       fun justify(length: Int, left: Float): String
+       fun justify(length: Int, left: Float, char: nullable Char): String
        do
+               var pad = (char or else ' ').to_s
                var diff = length - self.length
                if diff <= 0 then return to_s
                assert left >= 0.0 and left <= 1.0
                var before = (diff.to_f * left).to_i
-               return " " * before + self + " " * (diff-before)
+               return pad * before + self + pad * (diff-before)
        end
 
        # Mangle a string to be a unique string only made of alphanumeric characters and underscores.