(let [a 1 b 2] (+ a b) ;; cursor here, is there a way to make C-x C-e work? (+ 2 3))

debugger?

Yeah, probably that’d be the only option as you’d need to step through the code to evaluate this expression.

Another idea was suggest here https://github.com/clojure-emacs/cider/issues/2113 and it’s pretty great, but it also requires some parsing of the containing forms to figure out if something is local or not.

here's a dumbass idea I have in mind: contextful-eval which behaves at follows:

1. p = (point)
2. go backwards until first "^("
3. count how many unbalanced "([{" we got
4. append right number of "}})" to balance
5. evl

or, instead of step 2, do "get parent sexp until no parent exists"

Yeah, that’s a simpler version of what’s discussed in the ticket - there the idea is to find all local variables, get prompted for them and replace them in the expression that will get evaluated.

You idea would work for simple scenarios, but if there’s a local coming from a higher-level let this would break.

I don't understand. My naive reasoning is:

(let [...]
  (expr I want to eval) ;; cursor here
  (stuff I don't care about))

Ah, now I get it. I thought you wanted to find the first outer let. Should have paid more attention.

That’s actual much simpler as we already have the code that finds the top-level expression and the only thing needed it just terminate the expression after the current sexp. Should be trivial to implement.

the only thing needed it just terminate the expression after the current sexp <-- precisely what I had in mind, even better explanation! any chance this makes it into 0.18 ? 🙂

@qqq i made a function that will grab the locals from a debugging session

(defun cider-debug-create-local-let (start end)
  "During debugging, grab the locally bound vars and create a let
  binding. Place this let binding in the kill ring for future use."
  (interactive "r")
  (if cider--debug-mode-response
      (nrepl-dbind-response cider--debug-mode-response (locals)
        (let* ((code (buffer-substring-no-properties start end))
               (bindings (apply #'append locals))
               (formatted-bindings (mapconcat 'identity bindings " ")))
          (kill-new (format "(let [%s]\n %s)" formatted-bindings code))
          (message "copied let form to kill ring")))
    (message "No debugging information found.")))

while debugging, highlight some code and invoke this function. it will copy the forms you have highlighted and create a let binding binding all of the local vars in a debugging session

so in that example earlier, step through it and then highlight (+ a b) and call that function.

(defn stuff []
  (let [a 1
        b 2]
    (+ a b)
    (+ 2 3)))

(let [a 1 b 2]
 (+ a b))

CIDER install instructions say that "Starting with version 0.11, When cider-jack-in (C-c M-j) is used, CIDER takes care of injecting [nREPL] and its other dependencies." https://cider.readthedocs.io/en/latest/installation/#ciders-nrepl-middleware Yet, I'm seeing nrepl version-string "0.2.13" in nrepl-messages while on CIDER 0.16.0. Could this indicate a problem?

(This is related to debugging an issue where running tests from CIDER hangs indefinitely when a function returns a map that has a decimal value but runs fine with an integer value in the map.)

@daveliepmann I don't think so, isn't that just the version of nrepl being injected?

not sure, it definitely could be—but I would expect version 0.16.0 to be injected, right?

@dominicm

0.16.0 is cider version

yes, but aren't CIDER versions supposed to match nREPL versions? and nREPL repo says 0.16.0 is most recent and recommended https://github.com/clojure-emacs/cider-nrepl

@daveliepmann 0.2.13 is the tools.nrepl version 🙂

overloaded names are always a delight

thanks for the clarification

cider-nrepl -> CIDER nREPL middleware 🙂

@qqq file a ticket and put there our conversation highlights. Then everything is possible.

🙂

@dpsutton Cool utility!

does cider support the new 'clj' command?

like, can I run cider without lein or boot and just clj ?

@lockdown- only if you cider-connect

Indeed. CIDER simply needs some nREPL server to connect to. It doesn’t care how exactly it was started. Not sure how you can start a server with clj, though - I though it just starts a REPL with all deps you specific.

@bozhidar I put my nrepl start into user.clj

(don't put it into your component system, else a reset will disconnect you!)

@dominicm is user.clj a NS inside your src project?

@lockdown- yes

Interesting idea.

It does work, not followed it extensively.

I'm working out some kinks in tools.deps.alpha stopping us from using clj for an internalish project (the JUXT website)

https://github.com/mrroman/devtools/ this works too

That’s pretty cool!

Once clj adds support for a command line edn file https://dev.clojure.org/jira/browse/TDEPS-19 you can probably have a jack in like clj -G'{:extra-deps {cider-nrepl {}}}' -m cider.main cider.nrepl/middleware …

Yeah, that’s how I hope we can use this down the road.

@bozhidar https://github.com/clojure-emacs/cider/issues/2161 ticket filed!

Has anything changed in the last hour in cider-nrepl snapshot (0.17.0)?

Error loading refactor-nrepl.middleware: java.lang.IllegalAccessError: err-info does not exist, compiling:(refactor_nrepl/middleware.clj:1:1) Exception in thread "main" java.lang.RuntimeException: Unable to resolve var: refactor-nrepl.middleware/wrap-refactor in this context