flake: Add meson formatter

This adds a meson.format file that mostly mirrors the projects
meson style and a pre-commit hook to enforce this style.
Some low-diff files are formatted.

src/libexpr-test-support/include/nix/expr/tests/meson.build

@@ -1,9 +1,5 @@
 # Public headers directory
 
-include_dirs = [include_directories('../../..')]
+include_dirs = [ include_directories('../../..') ]
 
-headers = files(
-  'libexpr.hh',
-  'nix_api_expr.hh',
-  'value/context.hh',
-)
+headers = files('libexpr.hh', 'nix_api_expr.hh', 'value/context.hh')

src/libexpr/primops/meson.build

@@ -1,6 +1,6 @@
 generated_headers += gen_header.process(
   'derivation.nix',
-  preserve_path_from: meson.project_source_root(),
+  preserve_path_from : meson.project_source_root(),
 )
 
 sources += files(

src/libstore/linux/include/nix/store/meson.build

@@ -1,5 +1,3 @@
 include_dirs += include_directories('../..')
 
-headers += files(
-  'personality.hh',
-)
+headers += files('personality.hh')

src/libstore/linux/meson.build

@@ -1,5 +1,3 @@
-sources += files(
-  'personality.cc',
-)
+sources += files('personality.cc')
 
 subdir('include/nix/store')

src/libutil/freebsd/include/nix/util/meson.build

@@ -2,6 +2,4 @@
 
 include_dirs += include_directories('../..')
 
-headers += files(
-  'freebsd-jail.hh',
-)
+headers += files('freebsd-jail.hh')

src/libutil/freebsd/meson.build

@@ -1,5 +1,3 @@
-sources += files(
-  'freebsd-jail.cc',
-)
+sources += files('freebsd-jail.cc')
 
 subdir('include/nix/util')

src/libutil/include/nix/util/meson.build

@@ -1,6 +1,6 @@
 # Public headers directory
 
-include_dirs = [include_directories('../..')]
+include_dirs = [ include_directories('../..') ]
 
 headers = files(
   'abstract-setting-to-json.hh',
@@ -63,8 +63,8 @@ headers = files(
   'source-path.hh',
   'split.hh',
   'std-hash.hh',
-  'strings.hh',
   'strings-inline.hh',
+  'strings.hh',
   'suggestions.hh',
   'sync.hh',
   'tarfile.hh',

src/libutil/linux/include/nix/util/meson.build

@@ -2,7 +2,4 @@
 
 include_dirs += include_directories('../..')
 
-headers += files(
-  'cgroup.hh',
-  'linux-namespaces.hh',
-)
+headers += files('cgroup.hh', 'linux-namespaces.hh')

src/libutil/linux/meson.build

@@ -1,6 +1,3 @@
-sources += files(
-  'cgroup.cc',
-  'linux-namespaces.cc',
-)
+sources += files('cgroup.cc', 'linux-namespaces.cc')
 
 subdir('include/nix/util')

src/libutil/windows/include/nix/util/meson.build

@@ -2,8 +2,4 @@
 
 include_dirs += include_directories('../..')
 
-headers += files(
-  'signals-impl.hh',
-  'windows-async-pipe.hh',
-  'windows-error.hh',
-)
+headers += files('signals-impl.hh', 'windows-async-pipe.hh', 'windows-error.hh')

src/perl/t/meson.build

@@ -5,9 +5,7 @@
 # src
 #---------------------------------------------------
 
-nix_perl_tests = files(
-  'init.t',
-)
+nix_perl_tests = files('init.t')
 
 
 foreach f : nix_perl_tests