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[TNS-35] Read/analyze ClojureScript and conditional read sources Created: 24/Jul/15  Updated: 03/Nov/15  Resolved: 03/Nov/15

Status: Resolved
Project: tools.namespace
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Enhancement Priority: Major
Reporter: Stuart Sierra Assignee: Stuart Sierra
Resolution: Completed Votes: 1
Labels: None


Clojure 1.7 and ClojureScript 3308 introduced support for the Conditional Reader.

tools.namespace started out as a Clojure-only library. Support for the conditional reader was added in TNS-34, but it was hard-coded for Clojure (.clj and .cljc) files only.

Some high-level features of tools.namespace, such as code reloading via c.t.n.repl/refresh, are coupled to the Clojure(JVM) implementation, and could not easily be ported to ClojureScript. I regard that as a non-issue for now, since other tools (e.g. Figwheel) exist to do reloading in ClojureScript.

However, other features of tools.namespace, such as namespace dependency analysis, do not depend specifically on Clojure(JVM). It might be useful to apply those tools on ClojureScript source files.

The deeper problem is the multi-layered structure of tools.namespace. The Clojure/ClojureScript distinction only really matters in the "lower" layers such as c.t.n.file and c.t.n.parse, but the layered structure makes it awkward to pass options through from the "higher" layers such as c.t.n.dir and c.t.n.find.

See also comments on TNS-29.

This ticket is a place to capture work and notes about this problem.

Comment by Stuart Sierra [ 24/Jul/15 3:23 PM ]

Breakdown by namespace:

c.t.namespace is deprecated

c.t.n.dependency has no JVM-specific coupling, can be trivially ported to .cljc

c.t.n.track has no JVM-specific coupling, can be trivially ported to .cljc

c.t.n.parse has read-ns-decl calling clojure.core/read, which always uses default platform feature :clj. Can be modified to support reading .cljc files with the :cljs feature by replacing clojure.core/read with tools.reader.

c.t.n.file defines clojure-file? hard-coded to .clj and .cljc since TNS-34. Would be trivial to add clojurescript-file?.

c.t.n.dir calls c.t.n.file/clojure-file?

c.t.n.repl calls c.t.n.dir/scan

c.t.n.find calls c.t.n.file/clojure-file? and also uses hard-coded .clj and .cljc as file extensions to search within JAR files.

c.t.n.move is hard-coded to .clj files but is still "alpha" and not widely used

Comment by Laurent Petit [ 24/Jul/15 6:01 PM ]

couldn't `read-ns-decl` call `clojure.core/read` with `:read-cond` and `:features` options set appropriately? Is it really necessary to add `tools.reader` as a dependency (I would avoid it if possible)?

Comment by Stuart Sierra [ 25/Jul/15 10:10 AM ]

The reason you can't just pass different options to clojure.core/read is because, on Clojure(JVM) read will always add the platform feature :clj. There is no way to call read and force it to omit the platform feature.

See the Reader Conditionals design page, "The platform feature (:clj) will always be present."

Comment by Laurent Petit [ 25/Jul/15 3:10 PM ]

Oh, I didn't know that. It's kind of a shame, no, since it is well known that ClojureScript is compiled via Clojure (JVM) ...

Comment by Stuart Sierra [ 25/Jul/15 6:51 PM ]

As far as I know, ClojureScript has used tools.reader instead of clojure.core/read for some time.

Comment by Stuart Sierra [ 26/Jul/15 10:00 AM ]

My current thinking is:

c.t.n.dependency and c.t.n.track are platform agnostic.

c.t.n.file and c.t.n.parse can be extended to support Clojure & ClojureScript by adding an optional argument read-opts passed through to tools.reader/read.

c.t.n.find can be extended with optional arguments to select a "platform," either Clojure or ClojureScript, which will encapsulate both valid file extensions and reader options.

Reload/refresh functionality will remain Clojure(JVM) only for now: c.t.n.dir, c.t.n.reload, and c.t.n.repl.

c.t.n.move is still alpha and does not even support .cljc files. It can be handled under separate tickets or deprecated.

Work-in-progress visible on branch TNS-35-cljs-experiments currently at commit e9327295

Comment by Stuart Sierra [ 03/Nov/15 11:55 AM ]

.cljc support for read/parse/dependencies in 0.3.0-alpha* release

[TNS-36] Use java.classpath Created: 26/Jul/15  Updated: 06/Nov/15  Resolved: 06/Nov/15

Status: Resolved
Project: tools.namespace
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Enhancement Priority: Major
Reporter: Stuart Sierra Assignee: Stuart Sierra
Resolution: Completed Votes: 0
Labels: None

Attachments: Text File 0001-TNS-36-Use-java.classpath.patch     Text File 0001-TNS-36-Use-java.classpath.patch    
Patch: Code


Past versions of tools.namespace copied some functions (e.g. one, two) from java.classpath to avoid a dependency.

However, since the addition of CLASSPATH-5, tools.namespace has been missing some functionality necessary to fully resolve the classpath in some environments.

The purpose of this ticket is to 1) add a dependency on java.classpath; and 2) replace the duplicated functions in tools.namespace with their equivalents in java.classpath.

No public APIs in tools.namespace will be affected.

Comment by Stuart Sierra [ 06/Nov/15 2:13 PM ]

Included in 0.3.0-alpha1 release

[TNS-38] circular dependency when CLJS namespace requires CLJ for macros Created: 03/Nov/15  Updated: 05/Jan/16  Resolved: 05/Jan/16

Status: Resolved
Project: tools.namespace
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Defect Priority: Major
Reporter: Stuart Sierra Assignee: Stuart Sierra
Resolution: Completed Votes: 2
Labels: None


When a .cljs file defines a namespace with :require-macros of the same namespace name as a .clj file, tools.namespace reports a circular dependency error.

See https://github.com/clojure-emacs/refactor-nrepl/issues/127 for example

Comment by Stuart Sierra [ 05/Nov/15 2:21 PM ]

Possible short-term fix: just ignore the special case of a cljs namespace with :require-macros on itself.

Comment by Stuart Sierra [ 06/Nov/15 3:05 PM ]

Or maybe :require-macros shouldn't be parsed at all, since it is crossing the boundary between .cljs and .clj

Comment by Stuart Sierra [ 06/Nov/15 4:44 PM ]

Short-term fix in commit 6b19f942

Comment by Stuart Sierra [ 13/Nov/15 9:26 AM ]

Included in 0.3.0-alpha2 release

Comment by Stuart Sierra [ 28/Nov/15 9:07 AM ]

Reopening. Solution in -alpha2 is inadequate, see commit message at commit 149f4650

Comment by Stuart Sierra [ 05/Jan/16 7:50 AM ]

Fixed in commit 5d6957d by ignoring :require-macros when analyzing dependencies. I believe this is the correct solution for now: tools.namespace will treat Clojure and ClojureScript as separate worlds, and will not attempt to analyze dependency relationships which cross that boundary.

[TNS-5] Allow any valid .clj* source file to be parsed/analysed Created: 01/Nov/12  Updated: 05/Nov/15  Resolved: 05/Nov/15

Status: Resolved
Project: tools.namespace
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Enhancement Priority: Minor
Reporter: Max Penet Assignee: Stuart Sierra
Resolution: Completed Votes: 1
Labels: enhancement

Attachments: Text File e3cd6d1fa6e0c900bc1086e4a93bbc9cb343a820.patch    


This broadens the allowed file types to anything ending with #"\.clj.?$", meaning this would work for clj, cljs, cljc, cljx and possibly other Clojure implementations with their own extension in the future.

This allows libraries such as codox (and possibly autodoc) to work with ClojureScript and others implementations without any modification.

Note: My CA is on the way, I sent it a week ago, I am not sure if it arrived yet (it was sent from Switzerland with normal mail, with an ETA of 1 week).

Comment by Max Penet [ 02/Nov/12 6:51 AM ]

CA received it seems (I am listed on http://clojure.org/contributing ).

Comment by Stuart Sierra [ 02/Nov/12 3:23 PM ]

I'm not sure about this. If you're only using c.t.n.find in isolation, it's fine. But if you're using code-reloading and c.t.n.repl, it could incorrectly try to reload .cljs files in JVM Clojure.

We really need [Feature Expressions]http://dev.clojure.org/display/design/Feature+Expressions or something like it to get away from multiple file extensions.

Until then, I think it has to be optional. I don't know how best to achieve this. The APIs in c.t.n.repl and c.t.n.dir are not amenable to extension. I'll think about it.

Comment by Max Penet [ 06/Nov/12 6:11 PM ]

True, I didn't realize that.

Maybe using a dynamic var to hold the regex pattern (or a predicate?) could be a reasonable solution in the meantime, this would allow to rebind it in the case of codox & similar libs.
I don't really "like" to use dynamic vars (or regexes!), but in this case it might make sense.
Not to mention it would also allow more flexibility on projects where you don't want to have your clj codoxed, but only your cljs for instance.

Comment by Max Penet [ 24/Nov/12 7:47 AM ]

Any thoughts on my last comment/edit? I don't think there is a single doc lib that works with cljs at the moment, it is a bit painful to be honest.

Comment by Stuart Sierra [ 24/Nov/12 4:25 PM ]

Yes, I think a dynamic var would be OK. However, I would like to know of a real use case, not just a potential one.

Comment by Max Penet [ 13/Dec/12 2:40 AM ]

The idea was to be able to use codox on cljs files, I tried locally but there are other problems with this approach to be able to get to cljs vars metadata. So in the end I think you were right, maybe it's better to wait for feature expressions for this.

Comment by Stuart Sierra [ 05/Nov/15 2:20 PM ]

.cljs and .cljc are supported as of 0.3.0-alpha1 release

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