Why does joining paths completely replace the original path in Rust?





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I don't understand how Rust concatenates file paths. Why doesn't this work:



fn main() {

    let root = std::path::Path::new("resources/");

    let uri = std::path::Path::new("/js/main.js");

    let path = root.join(uri);

    assert_eq!(path.to_str(), Some("resources/js/main.js"));

}


fails with:



thread 'main' panicked at 'assertion failed: `(left == right)`

  left: `Some("/js/main.js")`,

 right: `Some("resources/js/main.js")`', src/main.rs:5:5


I see in the docs that "pushing an absolute path replaces the existing path", but this seems like a terrible idea that will catch a lot of people.



In that case, how do I safely strip the absolute path, or make it relative?






rust filepath







share|improve this question




















  • 1





    I guess you can see this: github.com/rust-lang/rust/issues/16507 discussion

    – Stoogy
    Nov 22 '18 at 12:05













  • @Stoogy thanks; I've commented on the issue.

    – Petrus Theron
    Nov 22 '18 at 17:28


















2















I don't understand how Rust concatenates file paths. Why doesn't this work:



fn main() {

    let root = std::path::Path::new("resources/");

    let uri = std::path::Path::new("/js/main.js");

    let path = root.join(uri);

    assert_eq!(path.to_str(), Some("resources/js/main.js"));

}


fails with:



thread 'main' panicked at 'assertion failed: `(left == right)`

  left: `Some("/js/main.js")`,

 right: `Some("resources/js/main.js")`', src/main.rs:5:5


I see in the docs that "pushing an absolute path replaces the existing path", but this seems like a terrible idea that will catch a lot of people.



In that case, how do I safely strip the absolute path, or make it relative?






rust filepath







share|improve this question




















  • 1





    I guess you can see this: github.com/rust-lang/rust/issues/16507 discussion

    – Stoogy
    Nov 22 '18 at 12:05













  • @Stoogy thanks; I've commented on the issue.

    – Petrus Theron
    Nov 22 '18 at 17:28














2












2








2








I don't understand how Rust concatenates file paths. Why doesn't this work:



fn main() {

    let root = std::path::Path::new("resources/");

    let uri = std::path::Path::new("/js/main.js");

    let path = root.join(uri);

    assert_eq!(path.to_str(), Some("resources/js/main.js"));

}


fails with:



thread 'main' panicked at 'assertion failed: `(left == right)`

  left: `Some("/js/main.js")`,

 right: `Some("resources/js/main.js")`', src/main.rs:5:5


I see in the docs that "pushing an absolute path replaces the existing path", but this seems like a terrible idea that will catch a lot of people.



In that case, how do I safely strip the absolute path, or make it relative?






rust filepath







share|improve this question
















I don't understand how Rust concatenates file paths. Why doesn't this work:



fn main() {

    let root = std::path::Path::new("resources/");

    let uri = std::path::Path::new("/js/main.js");

    let path = root.join(uri);

    assert_eq!(path.to_str(), Some("resources/js/main.js"));

}


fails with:



thread 'main' panicked at 'assertion failed: `(left == right)`

  left: `Some("/js/main.js")`,

 right: `Some("resources/js/main.js")`', src/main.rs:5:5


I see in the docs that "pushing an absolute path replaces the existing path", but this seems like a terrible idea that will catch a lot of people.



In that case, how do I safely strip the absolute path, or make it relative?






rust filepath




rust filepath






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 22 '18 at 21:24









Shepmaster

163k16337483




163k16337483










asked Nov 22 '18 at 11:50









Petrus TheronPetrus Theron

13.5k24114227




13.5k24114227








  • 1





    I guess you can see this: github.com/rust-lang/rust/issues/16507 discussion

    – Stoogy
    Nov 22 '18 at 12:05













  • @Stoogy thanks; I've commented on the issue.

    – Petrus Theron
    Nov 22 '18 at 17:28














  • 1





    I guess you can see this: github.com/rust-lang/rust/issues/16507 discussion

    – Stoogy
    Nov 22 '18 at 12:05













  • @Stoogy thanks; I've commented on the issue.

    – Petrus Theron
    Nov 22 '18 at 17:28








1




1





I guess you can see this: github.com/rust-lang/rust/issues/16507 discussion

– Stoogy
Nov 22 '18 at 12:05







I guess you can see this: github.com/rust-lang/rust/issues/16507 discussion

– Stoogy
Nov 22 '18 at 12:05















@Stoogy thanks; I've commented on the issue.

– Petrus Theron
Nov 22 '18 at 17:28





@Stoogy thanks; I've commented on the issue.

– Petrus Theron
Nov 22 '18 at 17:28












1 Answer
1






active

oldest

votes


















5














This is because "/js/main.js" is treated as an absolute path (doc)




If path is absolute, it replaces the current path.



On Windows:




  • if path has a root but no prefix (e.g. windows), it replaces everything except for the prefix (if any) of self.

  • if path has a prefix but no root, it replaces self.




If you change your example to "js/main.js" and then use join, it will be properly constructed (playground)






share|improve this answer


























  • Thanks, then how do I treat the incoming path as always relative?

    – Petrus Theron
    Nov 22 '18 at 12:07











  • FYI: os.path.join has the same behavior in Python. I am not sure why, but at least there's some consistency there.

    – Matthieu M.
    Nov 22 '18 at 12:08






  • 1





    @PetrusTheron I would suggest not using / at all. You can omit them completly.

    – hellow
    Nov 22 '18 at 12:11






  • 2





    @TimDiekmann quoting the doc: "The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is." ;)

    – hellow
    Nov 22 '18 at 12:16








  • 1





    @PetrusTheron you can use Path::strip_prefix to remove the leading /: playground

    – Jmb
    Nov 22 '18 at 15:54












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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









5














This is because "/js/main.js" is treated as an absolute path (doc)




If path is absolute, it replaces the current path.



On Windows:




  • if path has a root but no prefix (e.g. windows), it replaces everything except for the prefix (if any) of self.

  • if path has a prefix but no root, it replaces self.




If you change your example to "js/main.js" and then use join, it will be properly constructed (playground)






share|improve this answer


























  • Thanks, then how do I treat the incoming path as always relative?

    – Petrus Theron
    Nov 22 '18 at 12:07











  • FYI: os.path.join has the same behavior in Python. I am not sure why, but at least there's some consistency there.

    – Matthieu M.
    Nov 22 '18 at 12:08






  • 1





    @PetrusTheron I would suggest not using / at all. You can omit them completly.

    – hellow
    Nov 22 '18 at 12:11






  • 2





    @TimDiekmann quoting the doc: "The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is." ;)

    – hellow
    Nov 22 '18 at 12:16








  • 1





    @PetrusTheron you can use Path::strip_prefix to remove the leading /: playground

    – Jmb
    Nov 22 '18 at 15:54
















5














This is because "/js/main.js" is treated as an absolute path (doc)




If path is absolute, it replaces the current path.



On Windows:




  • if path has a root but no prefix (e.g. windows), it replaces everything except for the prefix (if any) of self.

  • if path has a prefix but no root, it replaces self.




If you change your example to "js/main.js" and then use join, it will be properly constructed (playground)






share|improve this answer


























  • Thanks, then how do I treat the incoming path as always relative?

    – Petrus Theron
    Nov 22 '18 at 12:07











  • FYI: os.path.join has the same behavior in Python. I am not sure why, but at least there's some consistency there.

    – Matthieu M.
    Nov 22 '18 at 12:08






  • 1





    @PetrusTheron I would suggest not using / at all. You can omit them completly.

    – hellow
    Nov 22 '18 at 12:11






  • 2





    @TimDiekmann quoting the doc: "The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is." ;)

    – hellow
    Nov 22 '18 at 12:16








  • 1





    @PetrusTheron you can use Path::strip_prefix to remove the leading /: playground

    – Jmb
    Nov 22 '18 at 15:54














5












5








5







This is because "/js/main.js" is treated as an absolute path (doc)




If path is absolute, it replaces the current path.



On Windows:




  • if path has a root but no prefix (e.g. windows), it replaces everything except for the prefix (if any) of self.

  • if path has a prefix but no root, it replaces self.




If you change your example to "js/main.js" and then use join, it will be properly constructed (playground)






share|improve this answer















This is because "/js/main.js" is treated as an absolute path (doc)




If path is absolute, it replaces the current path.



On Windows:




  • if path has a root but no prefix (e.g. windows), it replaces everything except for the prefix (if any) of self.

  • if path has a prefix but no root, it replaces self.




If you change your example to "js/main.js" and then use join, it will be properly constructed (playground)







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 22 '18 at 12:08

























answered Nov 22 '18 at 12:06









hellowhellow

5,80252344




5,80252344













  • Thanks, then how do I treat the incoming path as always relative?

    – Petrus Theron
    Nov 22 '18 at 12:07











  • FYI: os.path.join has the same behavior in Python. I am not sure why, but at least there's some consistency there.

    – Matthieu M.
    Nov 22 '18 at 12:08






  • 1





    @PetrusTheron I would suggest not using / at all. You can omit them completly.

    – hellow
    Nov 22 '18 at 12:11






  • 2





    @TimDiekmann quoting the doc: "The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is." ;)

    – hellow
    Nov 22 '18 at 12:16








  • 1





    @PetrusTheron you can use Path::strip_prefix to remove the leading /: playground

    – Jmb
    Nov 22 '18 at 15:54



















  • Thanks, then how do I treat the incoming path as always relative?

    – Petrus Theron
    Nov 22 '18 at 12:07











  • FYI: os.path.join has the same behavior in Python. I am not sure why, but at least there's some consistency there.

    – Matthieu M.
    Nov 22 '18 at 12:08






  • 1





    @PetrusTheron I would suggest not using / at all. You can omit them completly.

    – hellow
    Nov 22 '18 at 12:11






  • 2





    @TimDiekmann quoting the doc: "The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is." ;)

    – hellow
    Nov 22 '18 at 12:16








  • 1





    @PetrusTheron you can use Path::strip_prefix to remove the leading /: playground

    – Jmb
    Nov 22 '18 at 15:54

















Thanks, then how do I treat the incoming path as always relative?

– Petrus Theron
Nov 22 '18 at 12:07





Thanks, then how do I treat the incoming path as always relative?

– Petrus Theron
Nov 22 '18 at 12:07













FYI: os.path.join has the same behavior in Python. I am not sure why, but at least there's some consistency there.

– Matthieu M.
Nov 22 '18 at 12:08





FYI: os.path.join has the same behavior in Python. I am not sure why, but at least there's some consistency there.

– Matthieu M.
Nov 22 '18 at 12:08




1




1





@PetrusTheron I would suggest not using / at all. You can omit them completly.

– hellow
Nov 22 '18 at 12:11





@PetrusTheron I would suggest not using / at all. You can omit them completly.

– hellow
Nov 22 '18 at 12:11




2




2





@TimDiekmann quoting the doc: "The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is." ;)

– hellow
Nov 22 '18 at 12:16







@TimDiekmann quoting the doc: "The difference between absolutize and canonicalize methods is that absolutize does not care about whether the file exists and what the file really is." ;)

– hellow
Nov 22 '18 at 12:16






1




1





@PetrusTheron you can use Path::strip_prefix to remove the leading /: playground

– Jmb
Nov 22 '18 at 15:54





@PetrusTheron you can use Path::strip_prefix to remove the leading /: playground

– Jmb
Nov 22 '18 at 15:54




















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