Add astyle formatter (#169)

CHANGELOG.md

@@ -21,8 +21,10 @@ The format is based on [Keep a Changelog].
 * [`gawk`](https://www.gnu.org/software/gawk/) for
   [awk](https://en.wikipedia.org/wiki/AWK) ([#187]).
 * [`asmfmt`](https://github.com/klauspost/asmfmt) for assembly ([#168]).
+* [`astyle`](https://github.com/steinwurf/astyle) for C ([#169]).
 
 [#168]: https://github.com/radian-software/apheleia/pull/168
+[#169]: https://github.com/radian-software/apheleia/pull/169
 [#174]: https://github.com/radian-software/apheleia/pull/174
 [#182]: https://github.com/radian-software/apheleia/pull/182
 [#187]: https://github.com/radian-software/apheleia/pull/187

apheleia.el

@@ -32,7 +32,9 @@
   :link '(emacs-commentary-link :tag "Commentary" "apheleia"))
 
 (defcustom apheleia-formatters
-  '((asmfmt . ("asmfmt"))
+  '((astyle . ("astyle" (apheleia-formatters-locate-file
+                         "--options" ".astylerc")))
+    (asmfmt . ("asmfmt"))
     (bean-format . ("bean-format"))
     (black . ("black"
               (when (apheleia-formatters-extension-p "pyi") "--pyi")

test/formatters/installers/astyle.bash

@@ -0,0 +1 @@
+apt-get install -y astyle

test/formatters/samplecode/astyle/in.c

@@ -0,0 +1 @@
+../clang-format/in.c

test/formatters/samplecode/astyle/out.c

@@ -0,0 +1,5 @@
+// https://www.ioccc.org/2020/burton/prog.c
+int main(int b,char**i) {
+    long long n=B,a=I^n,r=(a/b&a)>>4,y=atoi(*++i),_=(((a^n/b)*(y>>T)|y>>S)&r)|(a^r);
+    printf("%.8s\n",(char*)&_);
+}