string: Add escaping for the POSIX Shell.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index 3059597..28ad7b5 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -494,6 +494,27 @@ abstract class Text
        #     assert "\n\"'\\\{\}".escape_to_nit      == "\\n\\\"\\'\\\\\\\{\\\}"
        fun escape_to_nit: String do return escape_more_to_c("\{\}")
 
+       # Escape to POSIX Shell (sh).
+       #
+       # Abort if the text contains a null byte.
+       #
+       #     assert "\n\"'\\\{\}0".escape_to_sh == "'\n\"'\\''\\\{\}0'"
+       fun escape_to_sh: String do
+               var b = new FlatBuffer
+               b.chars.add '\''
+               for i in [0..length[ do
+                       var c = chars[i]
+                       if c == '\'' then
+                               b.append("'\\''")
+                       else
+                               assert without_null_byte: c != '\0'
+                               b.add(c)
+                       end
+               end
+               b.chars.add '\''
+               return b.to_s
+       end
+
        # Return a string where Nit escape sequences are transformed.
        #
        #     var s = "\\n"