Clojurians Log v2

I am not familiar with this topic even not under the context of cljs. I am writing a react-native app with clojurescript. I wonder how to support sync data between the server so that when the mobile goes offline and later online again it will sync data (either upload to the server or retrieve data from the server as another device might have updated it).

If you want to know more about this search for the term "offline first"

But the big spoiler is that in the end you just have to pick a strategy on how to deal with merge conflicts.

There are 3 options when it comes to dealing with merge conflicts when syncing the 2 databases. Server is always right over the client, client is always right over the server or give the user some way to pick one of the 2 options

So I’m using cljs-node-io, it’s supposed to make <http://java.io|java.io>-like abstractions node.js file operations. I’m getting the same warnings while shadow compiles. This is one of 4 of the same warnings. The warning all happen when I use dot-methods from the library. For my intents and purposes this is no problem, just a bit noisy.

------ WARNING #1 - :infer-warning ---------------------------------------------
 File: /Users/main/Code/clojure/uniorg-util/src/uniorg_util/core.cljs:94:17
--------------------------------------------------------------------------------
  91 |           (let [d (io/file path)]
  92 |             (for [f (.listFiles d)]
  93 |               (when (.isFile f)
  94 |                 (.getName f))))))
-----------------------^--------------------------------------------------------
 Cannot infer target type in expression (. f getName)
--------------------------------------------------------------------------------
  95 |
  96 | (defn create-files [in-path out-path json?]
  97 |   (create-out-dir out-path)
  98 |   (let [input     (filter #(-> % io/file .getExt (= ".org"))
--------------------------------------------------------------------------------

I decided to use cljs-node-io.fs instead of the methods of the type File. No more warnings. Edit: looks a lot cleaner as well

For future reference: https://code.thheller.com/blog/shadow-cljs/2017/11/06/improved-externs-inference.html

tl;dr: add ^js in front of the definition of f. Just in case - make sure that it still works under advanced compilation with that addition.

Got it.

and also don't use a wrapper that tries to make it look like java. use the node methods directly. IMHO 😛

how do I get the namespace where a macro is called (instead of where the macro is defined)? We have *ns* in clj but not in cljs

you have *ns* in CLJS macros (given that they are written in CLJ)

but that's the ns of where the macro is defined? I am asking about where it's called

let me give an example

it is where the macro is called, not defined. *ns* is a runtime binding, which is bound to the current ns when expanding macros in the CLJS compiler. same as CLJ really.

thanks, let me try again

(ns <http://foo.app|foo.app>
  (:require [foo.macro-lib :as lib]))
  
(lib/mymacro foo)
=&gt; how to implement mymacro so that the above expands to `<http://foo.app/foo|foo.app/foo>`?

(defmacro mymacro [the-sym]
  (symbol (str *ns*) (name the-sym)))

I've tested, *ns* always return nil at run time.

at CLJS runtime yes, and macro-expansion time no (so CLJ compile time, there it is bound).

it works, thanks a lot

I think I’ll still use it for slurp and spit lol

FWIW (:require ["fs" :as fs]) and (fs/readFileSync path) or (fs/writeFileSync path content) would be slurp/spit equiv

I see! I’ll have to remember that for the next thing I build.

Has anybody used https://github.com/clojure/tools.cli/ for their projects? I’m considering using it for my node script here, I just need a little help with configuring some of the options. Maybe I could take a look at your project? https://github.com/wildwestrom/uniorg-util

shadow-cljs uses it https://github.com/thheller/shadow-cljs/blob/master/src/main/shadow/cljs/devtools/cli_opts.cljc#L57