annotate tests/test-highlight.t @ 24545:9e0c67e84896

json: implement {tags} template

Tags is pretty easy to implement. Let's start there.

The output is slightly different from `hg tags -Tjson`. For reference,
the CLI has the following output:

  [
   {
    "node": "e2049974f9a23176c2addb61d8f5b86e0d620490",
    "rev": 29880,
    "tag": "tip",
    "type": ""
   },
   ...
  ]

Our output has the format:

  {
    "node": "0aeb19ea57a6d223bacddda3871cb78f24b06510",
    "tags": [
      {
        "node": "e2049974f9a23176c2addb61d8f5b86e0d620490",
        "tag": "tag1",
        "date": [1427775457.0, 25200]
      },
      ...
    ]
  }

"rev" is omitted because it isn't a reliable identifier. We shouldn't
be exposing them in web APIs and giving the impression it remotely
resembles a stable identifier. Perhaps we could one day hide this behind
a config option (it might be useful to expose when running servers
locally).

The "type" of the tag isn't defined because this information isn't yet
exposed to the hgweb templater (it could be in a follow-up) and because
it is questionable whether different types should be exposed at all.
(Should the web interface really be exposing "local" tags?)

We use an object for the outer type instead of Array for a few reasons.
First, it is extensible. If we ever need to throw more global properties
into the output, we can do that without breaking backwards compatibility
(property additions should be backwards compatible). Second, uniformity
in web APIs is nice. Having everything return objects seems much saner than
a mix of array and object. Third, there are security issues with arrays
in older browsers. The JSON web services world almost never uses arrays
as the main type for this reason.

Another possibly controversial part about this patch is how dates are
defined. While JSON has a Date type, it is based on the JavaScript Date
type, which is widely considered a pile of garbage. It is a non-starter
for this reason.

Many of Mercurial's built-in date filters drop seconds resolution. So
that's a non-starter as well, since we want the API to be lossless where
possible. rfc3339date, rfc822date, isodatesec, and date are all lossless.
However, they each require the client to perform string parsing on top of
JSON decoding. While date parsing libraries are pretty ubiquitous, some
languages don't have them out of the box. However, pretty much every
programming language can deal with UNIX timestamps (which are just
integers or floats). So, we choose to use Mercurial's internal date
representation, which in JSON is modeled as float seconds since UNIX
epoch and an integer timezone offset from UTC (keep in mind
JavaScript/JSON models all "Numbers" as double prevision floating point
numbers, so there isn't a difference between ints and floats in JSON).

#require pygments serve

  $ cat <<EOF >> $HGRCPATH
  > [extensions]
  > highlight =
  > [web]
  > pygments_style = friendly
  > EOF
  $ hg init test
  $ cd test

create random Python file to exercise Pygments

  $ cat <<EOF > primes.py
  > #!/usr/bin/env python
  > 
  > """Fun with generators. Corresponding Haskell implementation:
  > 
  > primes = 2 : sieve [3, 5..]
  >     where sieve (p:ns) = p : sieve [n | n <- ns, mod n p /= 0]
  > """
  > 
  > from itertools import dropwhile, ifilter, islice, count, chain
  > 
  > def primes():
  >     """Generate all primes."""
  >     def sieve(ns):
  >         p = ns.next()
  >         # It is important to yield *here* in order to stop the
  >         # infinite recursion.
  >         yield p
  >         ns = ifilter(lambda n: n % p != 0, ns)
  >         for n in sieve(ns):
  >             yield n
  > 
  >     odds = ifilter(lambda i: i % 2 == 1, count())
  >     return chain([2], sieve(dropwhile(lambda n: n < 3, odds)))
  > 
  > if __name__ == "__main__":
  >     import sys
  >     try:
  >         n = int(sys.argv[1])
  >     except (ValueError, IndexError):
  >         n = 10
  >     p = primes()
  >     print "The first %d primes: %s" % (n, list(islice(p, n)))
  > EOF
  $ hg ci -Ama
  adding primes.py

hg serve

  $ hg serve -p $HGPORT -d -n test --pid-file=hg.pid -A access.log -E errors.log
  $ cat hg.pid >> $DAEMON_PIDS

hgweb filerevision, html

  $ ("$TESTDIR/get-with-headers.py" localhost:$HGPORT 'file/tip/primes.py') \
  >     | sed "s/class=\"k\"/class=\"kn\"/g" | sed "s/class=\"mf\"/class=\"mi\"/g"
  200 Script output follows
  
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  <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
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  <h3>view primes.py @ 0:853dcd4de2a6</h3>
  
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  <div class="sourcefirst"> line source</div>
  <pre class="sourcelines stripes4 wrap">
  <span id="l1"><span class="c">#!/usr/bin/env python</span></span><a href="#l1"></a>
  <span id="l2"></span><a href="#l2"></a>
  <span id="l3"><span class="sd">&quot;&quot;&quot;Fun with generators. Corresponding Haskell implementation:</span></span><a href="#l3"></a>
  <span id="l4"></span><a href="#l4"></a>
  <span id="l5"><span class="sd">primes = 2 : sieve [3, 5..]</span></span><a href="#l5"></a>
  <span id="l6"><span class="sd">    where sieve (p:ns) = p : sieve [n | n &lt;- ns, mod n p /= 0]</span></span><a href="#l6"></a>
  <span id="l7"><span class="sd">&quot;&quot;&quot;</span></span><a href="#l7"></a>
  <span id="l8"></span><a href="#l8"></a>
  <span id="l9"><span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></span><a href="#l9"></a>
  <span id="l10"></span><a href="#l10"></a>
  <span id="l11"><span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></span><a href="#l11"></a>
  <span id="l12">    <span class="sd">&quot;&quot;&quot;Generate all primes.&quot;&quot;&quot;</span></span><a href="#l12"></a>
  <span id="l13">    <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></span><a href="#l13"></a>
  <span id="l14">        <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></span><a href="#l14"></a>
  <span id="l15">        <span class="c"># It is important to yield *here* in order to stop the</span></span><a href="#l15"></a>
  <span id="l16">        <span class="c"># infinite recursion.</span></span><a href="#l16"></a>
  <span id="l17">        <span class="kn">yield</span> <span class="n">p</span></span><a href="#l17"></a>
  <span id="l18">        <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></span><a href="#l18"></a>
  <span id="l19">        <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></span><a href="#l19"></a>
  <span id="l20">            <span class="kn">yield</span> <span class="n">n</span></span><a href="#l20"></a>
  <span id="l21"></span><a href="#l21"></a>
  <span id="l22">    <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mi">2</span> <span class="o">==</span> <span class="mi">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></span><a href="#l22"></a>
  <span id="l23">    <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mi">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">&lt;</span> <span class="mi">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></span><a href="#l23"></a>
  <span id="l24"></span><a href="#l24"></a>
  <span id="l25"><span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span></span><a href="#l25"></a>
  <span id="l26">    <span class="kn">import</span> <span class="nn">sys</span></span><a href="#l26"></a>
  <span id="l27">    <span class="kn">try</span><span class="p">:</span></span><a href="#l27"></a>
  <span id="l28">        <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span></span><a href="#l28"></a>
  <span id="l29">    <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></span><a href="#l29"></a>
  <span id="l30">        <span class="n">n</span> <span class="o">=</span> <span class="mi">10</span></span><a href="#l30"></a>
  <span id="l31">    <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></span><a href="#l31"></a>
  <span id="l32">    <span class="kn">print</span> <span class="s">&quot;The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></span><a href="#l32"></a></pre>
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  >     | sed "s/class=\"k\"/class=\"kn\"/g" | sed "s/class=\"mi\"/class=\"mf\"/g"
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  <h3>annotate primes.py @ 0:853dcd4de2a6</h3>
  
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  <tr id="l1">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l1"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l1">     1</a> <span class="c">#!/usr/bin/env python</span></td>
  </tr>
  <tr id="l2">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l2"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l2">     2</a> </td>
  </tr>
  <tr id="l3">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l3"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l3">     3</a> <span class="sd">&quot;&quot;&quot;Fun with generators. Corresponding Haskell implementation:</span></td>
  </tr>
  <tr id="l4">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l4"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l4">     4</a> </td>
  </tr>
  <tr id="l5">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l5"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l5">     5</a> <span class="sd">primes = 2 : sieve [3, 5..]</span></td>
  </tr>
  <tr id="l6">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l6"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l6">     6</a> <span class="sd">    where sieve (p:ns) = p : sieve [n | n &lt;- ns, mod n p /= 0]</span></td>
  </tr>
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  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l7"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l7">     7</a> <span class="sd">&quot;&quot;&quot;</span></td>
  </tr>
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  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l8"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l8">     8</a> </td>
  </tr>
  <tr id="l9">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l9"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l9">     9</a> <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">dropwhile</span><span class="p">,</span> <span class="n">ifilter</span><span class="p">,</span> <span class="n">islice</span><span class="p">,</span> <span class="n">count</span><span class="p">,</span> <span class="n">chain</span></td>
  </tr>
  <tr id="l10">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l10"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l10">    10</a> </td>
  </tr>
  <tr id="l11">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l11"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l11">    11</a> <span class="kn">def</span> <span class="nf">primes</span><span class="p">():</span></td>
  </tr>
  <tr id="l12">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l12"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l12">    12</a>     <span class="sd">&quot;&quot;&quot;Generate all primes.&quot;&quot;&quot;</span></td>
  </tr>
  <tr id="l13">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l13"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l13">    13</a>     <span class="kn">def</span> <span class="nf">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
  </tr>
  <tr id="l14">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l14"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l14">    14</a>         <span class="n">p</span> <span class="o">=</span> <span class="n">ns</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></td>
  </tr>
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  <a href="/annotate/853dcd4de2a6/primes.py#l15"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l15">    15</a>         <span class="c"># It is important to yield *here* in order to stop the</span></td>
  </tr>
  <tr id="l16">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l16"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l16">    16</a>         <span class="c"># infinite recursion.</span></td>
  </tr>
  <tr id="l17">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l17"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l17">    17</a>         <span class="kn">yield</span> <span class="n">p</span></td>
  </tr>
  <tr id="l18">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l18"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l18">    18</a>         <span class="n">ns</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">%</span> <span class="n">p</span> <span class="o">!=</span> <span class="mf">0</span><span class="p">,</span> <span class="n">ns</span><span class="p">)</span></td>
  </tr>
  <tr id="l19">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l19"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l19">    19</a>         <span class="kn">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="n">sieve</span><span class="p">(</span><span class="n">ns</span><span class="p">):</span></td>
  </tr>
  <tr id="l20">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l20"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l20">    20</a>             <span class="kn">yield</span> <span class="n">n</span></td>
  </tr>
  <tr id="l21">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l21"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l21">    21</a> </td>
  </tr>
  <tr id="l22">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l22"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l22">    22</a>     <span class="n">odds</span> <span class="o">=</span> <span class="n">ifilter</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">i</span><span class="p">:</span> <span class="n">i</span> <span class="o">%</span> <span class="mf">2</span> <span class="o">==</span> <span class="mf">1</span><span class="p">,</span> <span class="n">count</span><span class="p">())</span></td>
  </tr>
  <tr id="l23">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l23"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l23">    23</a>     <span class="kn">return</span> <span class="n">chain</span><span class="p">([</span><span class="mf">2</span><span class="p">],</span> <span class="n">sieve</span><span class="p">(</span><span class="n">dropwhile</span><span class="p">(</span><span class="kn">lambda</span> <span class="n">n</span><span class="p">:</span> <span class="n">n</span> <span class="o">&lt;</span> <span class="mf">3</span><span class="p">,</span> <span class="n">odds</span><span class="p">)))</span></td>
  </tr>
  <tr id="l24">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l24"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l24">    24</a> </td>
  </tr>
  <tr id="l25">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l25"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l25">    25</a> <span class="kn">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span></td>
  </tr>
  <tr id="l26">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l26"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l26">    26</a>     <span class="kn">import</span> <span class="nn">sys</span></td>
  </tr>
  <tr id="l27">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l27"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l27">    27</a>     <span class="kn">try</span><span class="p">:</span></td>
  </tr>
  <tr id="l28">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l28"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l28">    28</a>         <span class="n">n</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mf">1</span><span class="p">])</span></td>
  </tr>
  <tr id="l29">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l29"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l29">    29</a>     <span class="kn">except</span> <span class="p">(</span><span class="ne">ValueError</span><span class="p">,</span> <span class="ne">IndexError</span><span class="p">):</span></td>
  </tr>
  <tr id="l30">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l30"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l30">    30</a>         <span class="n">n</span> <span class="o">=</span> <span class="mf">10</span></td>
  </tr>
  <tr id="l31">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l31"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l31">    31</a>     <span class="n">p</span> <span class="o">=</span> <span class="n">primes</span><span class="p">()</span></td>
  </tr>
  <tr id="l32">
  <td class="annotate">
  <a href="/annotate/853dcd4de2a6/primes.py#l32"
  title="853dcd4de2a6: a">test@0</a>
  </td>
  <td class="source"><a href="#l32">    32</a>     <span class="kn">print</span> <span class="s">&quot;The first </span><span class="si">%d</span><span class="s"> primes: </span><span class="si">%s</span><span class="s">&quot;</span> <span class="o">%</span> <span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="nb">list</span><span class="p">(</span><span class="n">islice</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">n</span><span class="p">)))</span></td>
  </tr>
  </tbody>
  </table>
  </div>
  </div>
  </div>
  
  <script type="text/javascript">process_dates()</script>
  
  
  </body>
  </html>
  

hgweb fileannotate, raw

  $ ("$TESTDIR/get-with-headers.py" localhost:$HGPORT 'annotate/tip/primes.py?style=raw') \
  >     | sed "s/test@//" > a
  $ echo "200 Script output follows" > b
  $ echo "" >> b
  $ echo "" >> b
  $ hg annotate "primes.py" >> b
  $ echo "" >> b
  $ echo "" >> b
  $ echo "" >> b
  $ echo "" >> b
  $ cmp b a || diff -u b a

hgweb filerevision, raw

  $ ("$TESTDIR/get-with-headers.py" localhost:$HGPORT 'file/tip/primes.py?style=raw') \
  >     > a
  $ echo "200 Script output follows" > b
  $ echo "" >> b
  $ hg cat primes.py >> b
  $ cmp b a || diff -u b a

hgweb highlightcss friendly

  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT 'highlightcss' > out
  $ head -n 4 out
  200 Script output follows
  
  /* pygments_style = friendly */
  
  $ rm out

errors encountered

  $ cat errors.log
  $ "$TESTDIR/killdaemons.py" $DAEMON_PIDS

Change the pygments style

  $ cat > .hg/hgrc <<EOF
  > [web]
  > pygments_style = fruity
  > EOF

hg serve again

  $ hg serve -p $HGPORT -d -n test --pid-file=hg.pid -A access.log -E errors.log
  $ cat hg.pid >> $DAEMON_PIDS

hgweb highlightcss fruity

  $ "$TESTDIR/get-with-headers.py" localhost:$HGPORT 'highlightcss' > out
  $ head -n 4 out
  200 Script output follows
  
  /* pygments_style = fruity */
  
  $ rm out

errors encountered

  $ cat errors.log
  $ cd ..
  $ hg init eucjp
  $ cd eucjp
  $ $PYTHON -c 'print("\265\376")' >> eucjp.txt  # Japanese kanji "Kyo"
  $ hg ci -Ama
  adding eucjp.txt
  $ hgserveget () {
  >     "$TESTDIR/killdaemons.py" $DAEMON_PIDS
  >     echo % HGENCODING="$1" hg serve
  >     HGENCODING="$1" hg serve -p $HGPORT -d -n test --pid-file=hg.pid -E errors.log
  >     cat hg.pid >> $DAEMON_PIDS
  > 
  >     echo % hgweb filerevision, html
  >     "$TESTDIR/get-with-headers.py" localhost:$HGPORT "file/tip/$2" \
  >         | grep '<div class="parity0 source">'
  >     echo % errors encountered
  >     cat errors.log
  > }
  $ hgserveget euc-jp eucjp.txt
  % HGENCODING=euc-jp hg serve
  % hgweb filerevision, html
  % errors encountered
  $ hgserveget utf-8 eucjp.txt
  % HGENCODING=utf-8 hg serve
  % hgweb filerevision, html
  % errors encountered
  $ hgserveget us-ascii eucjp.txt
  % HGENCODING=us-ascii hg serve
  % hgweb filerevision, html
  % errors encountered

  $ cd ..