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< h1 > Use git to calculate trusted mtimes< / h1 >
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< p > You can remark at the bottom of each page I provide a last modification date. This label was first calculated using the < code > mtime< / code > of the file on the file system. But many times I modify this date just to force some recompilation. Therefore the date wasn’ < em > real< / em > modification.< / p >
< p > I use < a href = "http://git-scm.org" > git< / a > to version my website. And fortunately I can know the last date of < em > real< / em > change of a file. This is how I do this with < a href = "http://nanoc.stoneship.org" > nanoc< / a > :< / p >
< div class = "sourceCode" id = "cb1" > < pre class = "sourceCode ruby" > < code class = "sourceCode ruby" > < a class = "sourceLine" id = "cb1-1" title = "1" > < span class = "kw" > def< / span > gitmtime< / a >
< a class = "sourceLine" id = "cb1-2" title = "2" > filepath=< span class = "ot" > @item< / span > .path.sub(< span class = "st" > '/Scratch/'< / span > ,< span class = "st" > 'content/html/'< / span > ).sub(< span class = "ot" > /\/$/< / span > ,< span class = "st" > ''< / span > )< / a >
< a class = "sourceLine" id = "cb1-3" title = "3" > ext=< span class = "ot" > %{< / span > < span class = "st" > .< / span > < span class = "ot" > #{@item< / span > [< span class = "st" > :extension< / span > ]< span class = "ot" > }}< / span > < / a >
< a class = "sourceLine" id = "cb1-4" title = "4" > filepath< < =ext< / a >
< a class = "sourceLine" id = "cb1-5" title = "5" > < span class = "kw" > if< / span > < span class = "kw" > not< / span > < span class = "dt" > FileTest< / span > .exists?(filepath)< / a >
< a class = "sourceLine" id = "cb1-6" title = "6" > filepath.sub!(ext,< span class = "ot" > %{#{@item< / span > .raw_filename< span class = "ot" > }#{< / span > ext< span class = "ot" > }}< / span > )< / a >
< a class = "sourceLine" id = "cb1-7" title = "7" > < span class = "kw" > end< / span > < / a >
< a class = "sourceLine" id = "cb1-8" title = "8" > str=< span class = "st" > `git log -1 --format='%ci' -- < / span > < span class = "ot" > #{< / span > filepath< span class = "ot" > }< / span > < span class = "st" > `< / span > < / a >
< a class = "sourceLine" id = "cb1-9" title = "9" > < span class = "kw" > if< / span > str.nil? < span class = "kw" > or< / span > str.empty?< / a >
< a class = "sourceLine" id = "cb1-10" title = "10" > < span class = "kw" > return< / span > < span class = "dt" > Time< / span > .now< / a >
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< a class = "sourceLine" id = "cb1-12" title = "12" > < span class = "kw" > return< / span > < span class = "dt" > DateTime< / span > .parse( str )< / a >
< a class = "sourceLine" id = "cb1-13" title = "13" > < span class = "kw" > end< / span > < / a >
< a class = "sourceLine" id = "cb1-14" title = "14" > < span class = "kw" > end< / span > < / a > < / code > < / pre > < / div >
< p > Of course I know it is really slow and absolutely not optimized. But it works as expected. Now the date you see at the bottom is exactly the date I modified the < em > content< / em > of the page.< / p >
< p > < em > Edit< / em > : Thanks to Eric Sunshine and Kris to provide me some hints at cleaning my code.< / p >
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