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util: compression APIs to support revlog compression...

util: compression APIs to support revlog compression As part of "zstd all of the things," we need to teach revlogs to use non-zlib compression formats. Because we're routing all compression via the "compression manager" and "compression engine" APIs, we need to introduction functionality there for performing revlog operations. Ideally, revlog compression and decompression operations would be implemented in terms of simple "compress" and "decompress" primitives. However, there are a few considerations that make us want to have a specialized primitive for handling revlogs: 1) Performance. Revlogs tend to do compression and especially decompression operations in batches. Any overhead for e.g. instantiating a "context" for performing an operation can be noticed. For this reason, our "revlog compressor" primitive is reusable. For zstd, we reuse the same compression "context" for multiple operations. I've measured this to have a performance impact versus constructing new contexts for each operation. 2) Specialization. By having a primitive dedicated to revlog use, we can make revlog-specific choices and leave the door open for more functionality in the future. For example, the zstd revlog compressor may one day make use of dictionary compression. A future patch will introduce a decompress() on the compressor object. The code for the zlib compressor is basically copied from revlog.compress(). Although it doesn't handle the empty input case, the null first byte case, and the 'u' prefix case. These cases will continue to be handled in revlog.py once that code is ported to use this API.

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        Alexander Plavin
    
hgweb: make stripes in log and search with CSS

              r19452
            
       <tr>

        Brodie Rao
    
hgweb: fix dynamic date calculation not working under Safari...

              r15375
            
        <td class="age">{date|rfc822date}</td>

        Dan Villiom Podlaski Christiansen
    
setup: install translation files as package data...

              r9999
            
        <td class="author">{author|person}</td>

        Anton Shestakov
    
hgweb: split some long lines in paper, gitweb and monoblue styles...

              r25108
            
        <td class="description">

         <a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a>

         {inbranch%changelogbranchname}{branches%changelogbranchhead}{tags%changelogtag}{bookmarks%changelogtag}

        </td>

        Dan Villiom Podlaski Christiansen
    
setup: install translation files as package data...

              r9999
            
       </tr>

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Alexander Plavin hgweb: make stripes in log and search with CSS	r19452	<tr>
Brodie Rao hgweb: fix dynamic date calculation not working under Safari...	r15375	<td class="age">{date\|rfc822date}</td>
Dan Villiom Podlaski Christiansen setup: install translation files as package data...	r9999	<td class="author">{author\|person}</td>
Anton Shestakov hgweb: split some long lines in paper, gitweb and monoblue styles...	r25108	<td class="description">
		<a href="{url\|urlescape}rev/{node\|short}{sessionvars%urlparameter}">{desc\|strip\|firstline\|escape\|nonempty}</a>
		{inbranch%changelogbranchname}{branches%changelogbranchhead}{tags%changelogtag}{bookmarks%changelogtag}
		</td>
Dan Villiom Podlaski Christiansen setup: install translation files as package data...	r9999	</tr>