Commit Diff

Commit:
93f814360076ccf28d33c9cb909fca7200ba4a7d
From:
g-branden-robinson <91402745+g-branden-robinson@users.noreply.github.com>
Via:
GitHub <noreply@github.com>
Date:
Message:
troff: support `\~` as an alias for `\ ` (#567) In groff, Heirloom Doctools troff, and neatroff, the `\~` escape sequence produces an adjustable (paddable) but unbreakable space. mandoc, which does not perform adjustment or render to typesetters, supports the escape sequence as a synonym for `\ `, the same as `\0`. This extension is of long pedigree: groff has supported it for at least 30 years, Heirloom for 17, mandoc for 13, and neatroff for 6. Do the same as mandoc to prevent mis-rendering of documents using this escape sequence. Heirloom Doctools troff, a descendant of Documenter's Workbench troff, would be a good place to look for a compatible implementation of the adjustable semantics for this sequence.
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Patch | Tree
commit - 506de8f6d4acedcb5b30f841611e6a4d95ce0feb
commit + 93f814360076ccf28d33c9cb909fca7200ba4a7d
blob - adda8c4b46ccabe4256644df55392c7ce7f2bb9b
blob + 27496b2f3a4c9883444c623272a0323f7d43c2ae
--- src/cmd/troff/n1.c
+++ src/cmd/troff/n1.c
@@ -512,6 +512,8 @@ g0:
 	case '\n':	/* concealed newline */
 		numtabp[CD].val++;
 		goto g0;
+	case '~':	/* Heirloom/groff/neatroff: unbreakable space */
+		; /* fall through */
 	case ' ':	/* unpaddable space */
 		i = UNPAD;
 		goto gx;