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acmart: simplify @title implementation

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Change LaTeX implementation of `@title` to just use `\title` --- don't try to extract a subtitle.

- - -

This fixes a bug, where the `Title` meta-data in the PDF for a document titled
 "Foo" was "oo" (same title with first letter missing). So, e.g., Google chrome
 would show "oo" as the tab title for the document.

- - -

Why not try to fix subtitle extraction?
  1. I don't think we need it in `scribble/acmart`, because there's a separate `@subtitle` command
  2. Not sure how to extract a subtitle without using `\let` inside `\title`, but doing so generates 2 LaTeX warnings:

     ```
       Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):
       (hyperref)                removing `\<let>-command' on input line 674.

       Package hyperref Warning: Token not allowed in a PDF string (PDFDocEncoding):
       (hyperref)                removing `\SSubtitle' on input line 674.
     ```

The "visual" bug was probably due to this warning; after removing the `\let`
 and `\SSubtitle` then only `\SubtitleDrop` and the actual title are left.
I guess `\SSubtitleDrop` removed the first character of the title.
(Why only the first character? I don't know.)

The LaTeX warning from `hyperref` is probably because acmart expects the
 argument to `\title` to be a raw string. Though, the docs don't explicitly
 say this. They only say "It is expected that this command [`\title`] is inserted
 by the author of the manuscript."
This commit is contained in:
Ben Greenman 2017-05-31 13:52:01 -04:00 committed by GitHub
parent b289b76536
commit f069b975fb
1 changed files with 4 additions and 13 deletions
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17
scribble-lib/scribble/acmart/style.tex
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@ -1,20 +1,11 @@
% Define \SXtitle to lift \SSubtitle out:
\newcommand{\SXtitle}[2][]{\title#1{\let\SSubtitle\SSubtitleDrop#2}\SExtractSubtitle#2\SExtractSubtitleDone}
\def\SSubtitleDrop#1{}
\def\SExtractSubtitleDone {}
\def\SExtractSubtitle{\futurelet\next\SExtractSubtitleX}
\def\SExtractSubtitleX#1{\ifx{#1}\SSubtitle \let\Snext\SWithSubtitle \else \let\Snext\SExtractSubtitleY \fi \Snext}
\def\SExtractSubtitleY{\ifx\next\SExtractSubtitleDone \let\Snext\relax \else \let\Snext\SExtractSubtitle \fi \Snext}
\def\SWithSubtitle#1{\subtitle{#1}\SExtractSubtitle}
\renewcommand{\titleAndVersionAndAuthors}[3]{\SXtitle{#1}#3\maketitle}
\renewcommand{\titleAndVersionAndAuthors}[3]{\title{#1}#3\maketitle}
\renewcommand{\titleAndEmptyVersionAndAuthors}[3]{\titleAndVersionAndAuthors{#1}{#2}{#3}}
\renewcommand{\titleAndVersionAndEmptyAuthors}[3]{\SXtitle{#1}\author{Anonymous Author(s)}\maketitle}
\renewcommand{\titleAndVersionAndEmptyAuthors}[3]{\title{#1}\author{Anonymous Author(s)}\maketitle}
\renewcommand{\titleAndEmptyVersionAndEmptyAuthors}[3]{\titleAndVersionAndEmptyAuthors{#1}{#2}{#3}}
\renewcommand{\titleAndVersionAndAuthorsAndShort}[4]{\SXtitle[[#4]]{#1}#3\maketitle}
\renewcommand{\titleAndVersionAndAuthorsAndShort}[4]{\title[#4]{#1}#3\maketitle}
\renewcommand{\titleAndEmptyVersionAndAuthorsAndShort}[4]{\titleAndVersionAndAuthorsAndShort{#1}{#2}{#3}{#4}}
\renewcommand{\titleAndVersionAndEmptyAuthorsAndShort}[4]{\SXtitle[[#4]]{#1}\author{Anonymous Author(s)}\maketitle}
\renewcommand{\titleAndVersionAndEmptyAuthorsAndShort}[4]{\title[#4]{#1}\author{Anonymous Author(s)}\maketitle}
\renewcommand{\titleAndEmptyVersionAndEmptyAuthorsAndShort}[4]{\titleAndVersionAndEmptyAuthorsAndShort{#1}{#2}{#3}{#4}}
% Support plain `author' while enabling `authorinfo': for each