ffclj link and logger example (#839 and #806) (#924)

* add ffclj to libraries list

* add simple logger macro to examples

* add a missing link on projects page

doc/projects.md

@@ -43,6 +43,7 @@ The following libraries and projects are known to work with babashka.
     - [slingshot](#slingshot)
     - [hasch](#hasch)
     - [crispin](#crispin)
+    - [ffclj](#ffclj)
   - [Pods](#pods)
   - [Projects](#projects-1)
     - [babashka-test-action](#babashka-test-action)
@@ -628,6 +629,10 @@ FOO=1 script.clj
 "1"
 ```
 
+### [ffclj](https://github.com/luissantos/ffclj)
+
+A wrapper around executing `ffmpeg` and `ffprobe`. Supports progress reporting via core.async channels.
+
 ## Pods
 
 [Babashka pods](https://github.com/babashka/babashka.pods) are programs that can

examples/README.md

@@ -35,6 +35,7 @@
   - [normalize-keywords.clj](#normalize-keywordsclj)
   - [Check stdin for data](#check-stdin-for-data)
   - [Using org.clojure/data.xml](#using-orgclojuredataxml)
+  - [Simple logger](#simple-logger)
 
 Here's a gallery of useful examples. Do you have a useful example? PR welcome!
 
@@ -512,3 +513,12 @@ in use.
 $ bb examples/xml-example.clj
 ... some vaguely interesting XML manipulation output
 ```
+
+## Simple logger
+
+[logger.clj](logger.clj) is a simple logger that works in bb.
+
+``` clojure
+$ bb "(require 'logger) (logger/log \"the logger says hi\")"
+<expr>:1:19 the logger says hi 
+```

examples/logger.clj

@@ -0,0 +1,11 @@
+(ns logger)
+
+(defmacro log [& msgs]
+  (let [m (meta &form)
+        _ns (ns-name *ns*) ;; can also be used for logging
+        file *file*]
+    `(binding [*out* *err*] ;; or bind to (io/writer log-file)
+       (println (str ~file ":"
+                  ~(:line m) ":"
+                  ~(:column m))
+         ~@msgs))))