Merge af9cabf into 60b95d7

documentation/c08-language.sil

@@ -186,6 +186,11 @@ The size of these spaces is determined by
 	\autodoc:setting[check=false]{languages.fr.colonspace} and
 	\autodoc:setting[check=false]{languages.fr.guillspace}.
 
+\subsection{Polish}
+
+According to Polish typography conventions, when a break occurs at an explicit hyphen, the hyphen gets repeated at the beginning of the new line.
+SILE automatically handles this.
+
 \subsection{Japanese / Chinese}
 
 SILE aims to conform with the W3G document “Requirements for Japanese Text Layout”\footnote{\url{https://www.w3.org/TR/jlreq/}} which describes the typographic conventions for Japanese (and also Chinese) text.

languages/pl.lua

@@ -1,3 +1,32 @@
+SILE.nodeMakers.pl = pl.class(SILE.nodeMakers.unicode)
+
+function SILE.nodeMakers.pl:handleWordBreak (item)
+  -- According to Polish rules, when a break occurs at an explicit hyphen,
+  -- the hyphen gets repeated at the beginning of the new line
+  if item.text == "-" then
+    self:addToken(item.text, item)
+    self:makeToken()
+    if self.lastnode ~= "discretionary" then
+      coroutine.yield(SILE.nodefactory.discretionary({
+        postbreak = SILE.shaper:createNnodes("-", self.options)
+      }))
+      self.lastnode = "discretionary"
+    end
+  else
+    self._base.handleWordBreak(self, item)
+  end
+end
+
+function SILE.nodeMakers.pl:handleLineBreak (item, subtype)
+  if self.lastnode == "discretionary" then
+    -- Initial word boundary after a discretionary:
+    -- Bypass it and just deal with the token.
+    self:dealWith(item)
+  else
+    self._base.handleLineBreak(self, item, subtype)
+  end
+end
+
 SILE.hyphenator.languages["pl"] = {}
 SILE.hyphenator.languages["pl"].patterns =
    {

tests/fix-polish-hyphen.expected

@@ -0,0 +1,23 @@
+Set paper size 	209.7637818	297.6377985
+Begin page
+Mx 	162.4882
+My 	26.9913
+Set font 	Gentium Plus;16;400;;normal;;;LTR
+T	69 76 68 1146 82 16 w=37.7344	(biało-)
+Mx 	10.4882
+My 	46.1913
+T	16 w=5.3906	(-)
+Mx 	15.8788
+T	70 93 72 85 90 82 81 92 w=63.5703	(czerwony)
+Mx 	130.4882
+My 	65.3913
+T	69 76 68 1146 82 16 w=37.7344	(biało-)
+Mx 	168.2226
+T	70 93 72 85 w=27.5078	(czer)
+Mx 	195.7304
+T	16 w=5.3906	(-)
+Mx 	10.4882
+My 	84.5913
+T	90 82 81 92 w=36.0625	(wony)
+End page
+Finish

tests/fix-polish-hyphen.sil

@@ -0,0 +1,13 @@
+\begin[papersize=a7]{document}
+\neverindent
+\nofolios
+\language[main=pl]
+\font[size=16pt]
+
+% Breaks at existing hyphens get a hyphen on the next line
+\kern[width=152pt]biało-czerwony
+
+% Breaks at other places just chill as usual
+\kern[width=120pt]biało-czerwony
+
+\end{document}