rewriter: create {add,rm}_extra_files commands

Add ability to mutate a target's `extra_files` list through the
rewriter.

The logic is copied from sources add/rm, but changes the `extra_files`
kwarg instead of the sources positional argument.
Has additional logic to handle creating the `extra_files` list if it
doesn't exist.

4 files changed, 282 insertions, 0 deletions

diff --git a/test cases/rewrite/6 extra_files/addExtraFiles.json b/test cases/rewrite/6 extra_files/addExtraFiles.json
new file mode 100644
index 0000000..421ed92
--- /dev/null
+++ b/test cases/rewrite/6 extra_files/addExtraFiles.json
@@ -0,0 +1,111 @@
+[
+  {
+    "type": "target",
+    "target": "trivialprog1",
+    "operation": "extra_files_add",
+    "sources": ["a2.hpp", "a1.hpp", "a2.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog2",
+    "operation": "extra_files_add",
+    "sources": ["a7.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog3",
+    "operation": "extra_files_add",
+    "sources": ["a5.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog4",
+    "operation": "extra_files_add",
+    "sources": ["a5.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog5",
+    "operation": "extra_files_add",
+    "sources": ["a3.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog7",
+    "operation": "extra_files_add",
+    "sources": ["a6.hpp", "a1.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog8",
+    "operation": "extra_files_add",
+    "sources": ["a2.hpp", "a7.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog9",
+    "operation": "extra_files_add",
+    "sources": ["a9.hpp", "a8.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog10",
+    "operation": "extra_files_add",
+    "sources": ["a4.hpp", "a1.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog0",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog1",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog2",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog3",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog4",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog5",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog6",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog7",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog8",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog9",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog10",
+    "operation": "info"
+  }
+]
diff --git a/test cases/rewrite/6 extra_files/info.json b/test cases/rewrite/6 extra_files/info.json
new file mode 100644
index 0000000..0f1a3bd
--- /dev/null
+++ b/test cases/rewrite/6 extra_files/info.json
@@ -0,0 +1,57 @@
+[
+  {
+    "type": "target",
+    "target": "trivialprog0",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog1",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "exe2",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog3",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "exe4",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog5",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "exe6",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog7",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "exe8",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog9",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog10",
+    "operation": "info"
+  }
+]
diff --git a/test cases/rewrite/6 extra_files/meson.build b/test cases/rewrite/6 extra_files/meson.build
new file mode 100644
index 0000000..f9aab46
--- /dev/null
+++ b/test cases/rewrite/6 extra_files/meson.build
@@ -0,0 +1,21 @@
+project('rewritetest', 'cpp')
+
+ef1 = ['main.hpp', 'fileA.hpp']
+ef2 = files(['fileB.hpp', 'fileC.hpp'])
+ef3 = ef1
+ef4 = [ef3]
+ef5 = []
+
+# Magic comment
+
+exe0 = executable('trivialprog0', 'main.cpp', extra_files : ef1 + ef2)
+exe1 = executable('trivialprog1', 'main.cpp', extra_files : ef1)
+exe2 = executable('trivialprog2', 'main.cpp', extra_files : [ef2])
+exe3 = executable('trivialprog3', 'main.cpp', extra_files : ['main.hpp', 'fileA.hpp'])
+exe4 = executable('trivialprog4', 'main.cpp', extra_files : ['main.hpp', ['fileA.hpp']])
+exe5 = executable('trivialprog5', 'main.cpp', extra_files : [ef2, 'main.hpp'])
+exe6 = executable('trivialprog6', 'main.cpp', extra_files : ef3)
+executable('trivialprog7', 'main.cpp', extra_files : ef4)
+exe8 = executable('trivialprog8', 'main.cpp', extra_files : [])
+exe9 = executable('trivialprog9', 'main.cpp')
+exe10 = executable('trivialprog10', 'main.cpp', extra_files : ef5)
diff --git a/test cases/rewrite/6 extra_files/rmExtraFiles.json b/test cases/rewrite/6 extra_files/rmExtraFiles.json
new file mode 100644
index 0000000..bd2855b
--- /dev/null
+++ b/test cases/rewrite/6 extra_files/rmExtraFiles.json
@@ -0,0 +1,93 @@
+[
+  {
+    "type": "target",
+    "target": "trivialprog1",
+    "operation": "extra_files_rm",
+    "sources": ["fileA.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog3",
+    "operation": "extra_files_rm",
+    "sources": ["fileA.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog4",
+    "operation": "extra_files_rm",
+    "sources": ["fileA.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog5",
+    "operation": "extra_files_rm",
+    "sources": ["fileB.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog6",
+    "operation": "extra_files_rm",
+    "sources": ["fileA.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog7",
+    "operation": "extra_files_rm",
+    "sources": ["fileA.hpp"]
+  },
+  {
+    "type": "target",
+    "target": "trivialprog0",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog1",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog2",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog3",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog4",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog5",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog6",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog7",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog8",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog9",
+    "operation": "info"
+  },
+  {
+    "type": "target",
+    "target": "trivialprog10",
+    "operation": "info"
+  }
+]