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ProjectFile.save with forceTouch to only modify the last write time without content if unchanged #1493

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Mar 1, 2016
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ProjectFile.save with forceTouch to only modify the last write time without content if unchanged #1493

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ProjectFile.touch to only modify the last write time without changing…
cdrnet Mar 1, 2016
933c9b9
ProjectFile.touch to save the project file if it does not exist
cdrnet Mar 1, 2016
a9b6eca
Project.save with forceTouch=true to only touch last-write-date inste…
cdrnet Mar 1, 2016
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2 changes: 1 addition & 1 deletion src/Paket.Core/FindReferences.fs
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Expand Up @@ -39,7 +39,7 @@ let TouchReferencesOfPackages packages environment = trial {
|> List.distinctBy (fun project-> project.FileName)
|> List.iter (fun project ->
verbosefn "Touching project %s" project.FileName
ProjectFile.save true project)
ProjectFile.touch project)
}

let ShowReferencesFor packages environment = trial {
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7 changes: 6 additions & 1 deletion src/Paket.Core/ProjectFile.fs
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Expand Up @@ -941,6 +941,9 @@ module ProjectFile =
project.ProjectNode.AppendChild analyzersNode |> ignore
)

let touch (project:ProjectFile) =
if File.Exists(project.FileName) then
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It changes the logic previously present.
When the file wasn't present, it was created by the save true project call.
Please adjust accordingly.

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It does not change any behavior as before the touching was only exposed indirectly through routines where the file was known to be present.

But I agree, touch is typically expected to create the file if not present. Since it is exposed directly now, we better adapt it to follow that expectation.

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You maybe right about the way how it was ever accessed, but my comment was based on the how the logic is written in the save function and how it changed in the touch. I mean touch was intended to be equivalent to save true, right? No matter in which context is ever called.

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No - touch is not intended to change the file content, only to make the file appear as if it had changed. Just like the touch tool on unix. The primary use case is to help msbuild incremental build detect it needs to rebuild a project.

Maybe it was a mistake to expose it as member?

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I was a little bit incorrect in my wording, touch was intended to replace the save true call.

But you're right, why should it be there in first place?
The project file should know the own state, whether it's changed or not, right? So save true could actually utilize this knowledge to decide whether to simply change the last access date or write out the contents.

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On second thought - maybe it would make more sense to slightly change the behavior of save instead of adding touch, along the lines of:

   let save forceTouch project =
        if Utils.normalizeXml project.Document <> project.OriginalText then 
            verbosefn "Project %s changed" project.FileName
            project.Document.Save(project.FileName)
        elif forceTouch && File.Exists(project.FileName) then
            File.SetLastWriteTimeUtc(project.FileName, DateTime.UtcNow)

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Seems we've come to the same conclusion concurrently ;)

File.SetLastWriteTimeUtc(project.FileName, DateTime.UtcNow)

let save forceTouch project =
if forceTouch then
Expand Down Expand Up @@ -1305,7 +1308,9 @@ type ProjectFile with
member this.RemovePaketNodes () = ProjectFile.removePaketNodes this

member this.UpdateReferences (completeModel, usedPackages, hard) = ProjectFile.updateReferences completeModel usedPackages hard this


member this.Touch () = ProjectFile.touch this

member this.Save(forceTouch) = ProjectFile.save forceTouch this

member this.GetPaketFileItems () = ProjectFile.getPaketFileItems this
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