Merge branch 'develop' for v1.2.1

Author: matthewdowney

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Change Log
 
+## [1.2.1] - 2020-04-01
+### Added
+- Can bind a dynamic `*n-threads*` var to set the number of threads used during 
+  writing.
+
+## [1.2.0] - 2020-08-13
+### Added
+- Performance improvements for large worksheets.
+
 ## [1.1.2] - 2019-06-04
 ### Fixed
 - If the first level of the tree is a leaf, `accounting-table` doesn't walk it 

README.md

@@ -8,7 +8,7 @@ common sense styling.
 
 Lein:
 ```
-[org.clojars.mjdowney/excel-clj "1.2.0"]
+[org.clojars.mjdowney/excel-clj "1.2.1"]
 ```
 
 - [Getting Started](#getting-started)

project.clj

@@ -1,4 +1,4 @@
-(defproject org.clojars.mjdowney/excel-clj "1.2.0"
+(defproject org.clojars.mjdowney/excel-clj "1.2.1"
   :description "Generate Excel documents & PDFs from Clojure data."
   :url "https://github.com/matthewdowney/excel-clj"
   :license {:name "Eclipse Public License"

src/excel_clj/core.clj

@@ -89,10 +89,14 @@
   the column width."
   15000)
 
+(def ^:dynamic *n-threads*
+  "Allow a custom number of threads used during writing."
+  (+ 2 (.. Runtime getRuntime availableProcessors)))
+
 (defmacro ^:private doparallel [[sym coll] & body]
   "Performance hack for writing the POI cells.
   Like (dotimes [x xs] ...) but parallel."
-  `(let [n# (+ 2 (.. Runtime getRuntime availableProcessors))
+  `(let [n# *n-threads*
          equal-chunks# (loop [num# n#, parts# [], coll# ~coll, c# (count ~coll)]
                          (if (<= num# 0)
                            parts#