source: chapter06/readline.xml@ e747759

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<sect1 id="ch-system-readline" role="wrap">
  <?dbhtml filename="readline.html"?>

  <sect1info condition="script">
    <productname>readline</productname>
    <productnumber>&readline-version;</productnumber>
    <address>&readline-url;</address>
  </sect1info>

  <title>Readline-&readline-version;</title>

  <indexterm zone="ch-system-readline">
    <primary sortas="a-Readline">Readline</primary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>The Readline package is a set of libraries that offers command-line
    editing and history capabilities.</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&readline-ch6-sbu;</seg>
        <seg>&readline-ch6-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Readline</title>

    <para>Reinstalling Readline will cause the old libraries to be moved to
    &lt;libraryname&gt;.old. While this is normally not a problem, in some cases
    it can trigger a linking bug in <command>ldconfig</command>. This can be
    avoided by issuing the following two seds:</para>

<screen><userinput>sed -i '/MV.*old/d' Makefile.in
sed -i '/{OLDSUFF}/c:' support/shlib-install</userinput></screen>

    <para>Readline contains a bug in its handling of non-multibyte characters,
    which can lead to incorrect display calculations and incorrect redisplay.
    Fix this issue by applying the following patch from the upstream maintainer:
    </para>

<screen><userinput>patch -Np1 -i ../&readline-fixes-patch;</userinput></screen>

    <para>Prepare Readline for compilation:</para>

<screen><userinput>./configure --prefix=/usr --libdir=/lib</userinput></screen>

    <para>Compile the package:</para>

<screen><userinput>make SHLIB_LIBS=-lncurses</userinput></screen>

    <variablelist>
      <title>The meaning of the make option:</title>

      <varlistentry>
        <term><parameter>SHLIB_LIBS=-lncurses</parameter></term>
        <listitem>
          <para>This option forces Readline to link against the
          <filename class="libraryfile">libncurses</filename> (really,
          <filename class="libraryfile">libncursesw</filename>) library.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>This package does not come with a test suite.</para>

    <para>Install the package:</para>

<screen><userinput>make install</userinput></screen>

    <para>Now move the static libraries to a more appropriate location:</para>

<screen><userinput>mv -v /lib/lib{readline,history}.a /usr/lib</userinput></screen>

    <para>Next, remove the <filename class="extension">.so</filename> files in
    <filename class="directory">/lib</filename> and relink them into <filename
    class="directory">/usr/lib</filename>:</para>

<screen><userinput>rm -v /lib/lib{readline,history}.so
ln -sfv ../../lib/libreadline.so.5 /usr/lib/libreadline.so
ln -sfv ../../lib/libhistory.so.5 /usr/lib/libhistory.so</userinput></screen>

  </sect2>

  <sect2 id="contents-readline" role="content">
    <title>Contents of Readline</title>

    <segmentedlist>
      <segtitle>Installed libraries</segtitle>

      <seglistitem>
        <seg>libhistory.{a,so}, and libreadline.{a,so}</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="libhistory">
        <term><filename class="libraryfile">libhistory</filename></term>
        <listitem>
          <para>Provides a consistent user interface for recalling lines
          of history</para>
          <indexterm zone="ch-system-readline libhistory">
            <primary sortas="c-libhistory">libhistory</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libreadline">
        <term><filename class="libraryfile">libreadline</filename></term>
        <listitem>
          <para>Aids in the consistency of user interface across discrete
          programs that need to provide a command line interface</para>
          <indexterm zone="ch-system-readline libreadline">
            <primary sortas="c-libreadline">libreadline</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>