Following "Using the Figwheel REPL within NRepl" leads to "Figwheel Configuration Error"

[p-himik]

Leiningen 2.7.1 lein-figwheel 0.5.12

I'm using Dirac that requires nREPL. Running both lein repl and lein figwheel consumes quite a lot of memory, so I decided to try the steps at Using the Figwheel REPL within NRepl. Everything went fine, up to a moment when I had to run (start-figwheel!). It gave me an error:

user=> (start-figwheel!)
(start-figwheel!)
Error reading Configuration

ExceptionInfo ------ Figwheel Configuration Error ------

Missing required key :cljsbuild at path []

/home/p-himik/dev/git/mga/cedar2/project.clj:48:2
  43   :less {:source-paths ["frontend/static/less"]
  44          :target-path  "frontend/static/css"
  45          :source-map   true
  46          :compression  true}
  47 
  48   :cljsbuild {:builds
       ^---  Map is missing required key: :cljsbuild
  49               {:main
  50                {:source-paths ["frontend/cljs"]
  51                 :compiler     {:main         cedar2.core
  52                                :foreign-libs [; https://github.com/zenozeng/color-hash 70a2325
  53                                               #_{:file     "frontend/static/js-inc/color-hash/color-hash.js"

------------------------------------------
  clojure.core/ex-info (core.clj:4725)

lein figwheel works fine by itself, saying Figwheel: Configuration Valid ;)

Am I missing something? Are there additional requirements for project.clj when running figwheel from inside the nREPL?

[darwin]

Not sure about this error. But you should definitely check this out: https://github.com/binaryage/dirac/blob/master/docs/about-repls.md#dirac--figwheel

Ideally you want Figwheel sidecar to run inside the same JVM as Dirac and make Dirac use Figwheel's compiler.

[darwin]

Here is the relevant config from dirac-sample project: https://github.com/binaryage/dirac-sample/blob/master/project.clj#L170-L196

[p-himik]

Thanks, I'll try!

But isn't it cheating in a way? It seems that I have to duplicate the build configuration inside the project configuration, that already includes the build configuration.

[bhauman]

This does seem odd. You may have something in your project.clj that makes it hard to read.

[p-himik]

@darwin Works! Thanks again. Although I don't really like duplicated info, and I can't seem to extract it to an external def. I've asked a question about it on the clojurians channel.

@bhauman I just tried to reduce my project.clj to the minimal state where the error is still reproducible, and I ended up trying the code from the guide, verbatim. The error is still there. Just in case, here's that project.clj:

(defproject repler "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.7.0"]
                 [org.clojure/clojurescript "1.7.170"]]

  :plugins [[lein-figwheel "0.5.0-1"]]

  :source-paths ["src"]

  :clean-targets ^{:protect false} ["resources/public/js" :target]

  :cljsbuild {:builds
              [{:id           "dev"
                :source-paths ["cljs_src"]
                :figwheel     true
                :compiler     {:main       repler.core
                               :asset-path "js/out"
                               :output-to  "resources/public/js/repler.js"
                               :output-dir "resources/public/js/out"}}]}
  :profiles {:dev {:dependencies [[figwheel-sidecar "0.5.8"]]
                   :source-paths ["cljs_src"]}})

[bhauman]

I think you make have something in your ~/.lein/profiles that is messing this up.

For a minimal case try: lein new figwheel hello lein repl => (fig-start)

[p-himik]

 % ls /etc/leiningen -al                      
total 20
drwxr-xr-x   2 root root  4096 Oct  5  2016 .
drwxr-xr-x 208 root root 16384 Aug  3 17:01 ..

 % ls -al ~/.lein                                                
total 20
drwxrwxr-x   3 p-himik p-himik  4096 Aug  4 21:42 .
drwxr-xr-x 166 p-himik p-himik 12288 Aug  4 21:44 ..
drwxrwxr-x   2 p-himik p-himik  4096 Aug  4 21:43 self-installs

 % lein new figwheel hello                                                    
Retrieving figwheel/lein-template/0.5.12/lein-template-0.5.12.pom from clojars
Retrieving figwheel/lein-template/0.5.12/lein-template-0.5.12.jar from clojars
Generating fresh 'lein new' figwheel project.

Change into your 'hello' directory and run 'lein figwheel'
Wait for it to finish compiling
Then open 'http://localhost:3449/index.html' in your browser

 % cd hello

 % lein repl                                                                                                                      21:54:56 2017-08-04 !10116
Retrieving lein-cljsbuild/lein-cljsbuild/1.1.7/lein-cljsbuild-1.1.7.pom from clojars
Retrieving lein-cljsbuild/lein-cljsbuild/1.1.7/lein-cljsbuild-1.1.7.jar from clojars
Retrieving org/clojure/clojurescript/1.9.854/clojurescript-1.9.854.pom from central
Retrieving com/google/javascript/closure-compiler-unshaded/v20170626/closure-compiler-unshaded-v20170626.pom from central
Retrieving com/google/javascript/closure-compiler-main/v20170626/closure-compiler-main-v20170626.pom from central
Retrieving com/google/javascript/closure-compiler-parent/v20170626/closure-compiler-parent-v20170626.pom from central
Retrieving com/google/javascript/closure-compiler-externs/v20170626/closure-compiler-externs-v20170626.pom from central
Retrieving org/clojure/tools.reader/1.0.3/tools.reader-1.0.3.pom from central
Retrieving org/clojure/tools.reader/1.0.3/tools.reader-1.0.3.jar from central
Retrieving com/google/javascript/closure-compiler-unshaded/v20170626/closure-compiler-unshaded-v20170626.jar from central
Retrieving com/google/javascript/closure-compiler-externs/v20170626/closure-compiler-externs-v20170626.jar from central
Retrieving org/clojure/clojurescript/1.9.854/clojurescript-1.9.854.jar from central
nREPL server started on port 39570 on host 127.0.0.1 - nrepl://127.0.0.1:39570
REPL-y 0.3.7, nREPL 0.2.12
Clojure 1.8.0
Java HotSpot(TM) 64-Bit Server VM 1.8.0_112-b15
    Docs: (doc function-name-here)
          (find-doc "part-of-name-here")
  Source: (source function-name-here)
 Javadoc: (javadoc java-object-or-class-here)
    Exit: Control+D or (exit) or (quit)
 Results: Stored in vars *1, *2, *3, an exception in *e

user=> (fig-start)
Error reading Configuration

ExceptionInfo ------ Figwheel Configuration Error ------

Missing required key :cljsbuild at path []

/home/p-himik/hello/project.clj:19:2
  14   :plugins [[lein-figwheel "0.5.12"]
  15             [lein-cljsbuild "1.1.7" :exclusions [[org.clojure/clojure]]]]
  16 
  17   :source-paths ["src"]
  18 
  19   :cljsbuild {:builds
       ^---  Map is missing required key: :cljsbuild
  20               [{:id "dev"
  21                 :source-paths ["src"]
  22 
  23                 ;; The presence of a :figwheel configuration here
  24                 ;; will cause figwheel to inject the figwheel client

------------------------------------------
  clojure.core/ex-info (core.clj:4617)
user=>

[p-himik]

@bhauman I've found the cause - I have a directory /etc/leiningen. According to the documentation at https://github.com/technomancy/leiningen/blob/master/doc/PROFILES.md#declaring-profiles it should be a directory, however the code at https://github.com/bhauman/simple-lein-profile-merge/blob/master/src/simple_lein_profile_merge/core.clj#L183 tries to read it as a file. The corresponding code at https://github.com/technomancy/leiningen/blob/master/leiningen-core/src/leiningen/core/project.clj#L693 does indeed use it just as a dir, appending "profile.clj" later. This incorrect handling of global profile location leads to

{:type java.io.FileNotFoundException
   :message "/etc/leiningen (Is a directory)"
   :at [java.io.FileInputStream open0 "FileInputStream.java" -2]}]

It gets caught in https://github.com/bhauman/lein-figwheel/blob/master/sidecar/src/figwheel_sidecar/config.clj#L547 and somewhere later it's printed just as

Error reading Configuration

ExceptionInfo

without any actual info. I'm not sure why - I didn't try to dig that deep.

I obviously don't know all the history behind all involved projects, but wouldn't it make more sense to work with Leiningen folks to extract profile-related stuff to a separate library? This way there would be no code duplication, uniform behavior, and there will be one set of thorough tests.

[p-himik]

Another strange thing - documentation at https://github.com/bhauman/lein-figwheel/wiki/Using-the-Figwheel-REPL-within-NRepl#launching-figwheel-from-nrepl says: "no leiningen profile merging will occur". But it clearly tries to merge them! Otherwise, there would be no such error.