style(3p/nix): Enforce braces around loops and conditionals r/767

This change was generated with:

  fd -e cc -e hh | xargs -I{} clang-tidy {} -p ~/projects/nix-build/ \
    --checks='-*,readability-braces-around-statements' --fix \
    -fix-errors

Some manual fixes were applied because some convoluted unbraced
statements couldn't be untangled by clang-tidy.

This commit still includes invalid files, but I decided to clean them
up in a subsequent commit so that it becomes more obvious where
clang-tidy failed. Maybe this will allow for a bug-report to
clang-tidy.

1 files changed, 12 insertions, 6 deletions

diff --git a/third_party/nix/src/libexpr/eval-inline.hh b/third_party/nix/src/libexpr/eval-inline.hh
index 37105e7e398d..d92614ca7ca6 100644
--- a/third_party/nix/src/libexpr/eval-inline.hh
+++ b/third_party/nix/src/libexpr/eval-inline.hh
@@ -38,33 +38,39 @@ void EvalState::forceValue(Value& v, const Pos& pos) {
       v.thunk.expr = expr;
       throw;
     }
-  } else if (v.type == tApp)
+  } else if (v.type == tApp) {
     callFunction(*v.app.left, *v.app.right, v, noPos);
-  else if (v.type == tBlackhole)
+  } else if (v.type == tBlackhole) {
     throwEvalError("infinite recursion encountered, at %1%", pos);
+  }
 }
 
 inline void EvalState::forceAttrs(Value& v) {
   forceValue(v);
-  if (v.type != tAttrs)
+  if (v.type != tAttrs) {
     throwTypeError("value is %1% while a set was expected", v);
+  }
 }
 
 inline void EvalState::forceAttrs(Value& v, const Pos& pos) {
   forceValue(v);
-  if (v.type != tAttrs)
+  if (v.type != tAttrs) {
     throwTypeError("value is %1% while a set was expected, at %2%", v, pos);
+  }
 }
 
 inline void EvalState::forceList(Value& v) {
   forceValue(v);
-  if (!v.isList()) throwTypeError("value is %1% while a list was expected", v);
+  if (!v.isList()) {
+    throwTypeError("value is %1% while a list was expected", v);
+  }
 }
 
 inline void EvalState::forceList(Value& v, const Pos& pos) {
   forceValue(v);
-  if (!v.isList())
+  if (!v.isList()) {
     throwTypeError("value is %1% while a list was expected, at %2%", v, pos);
+  }
 }
 
 /* Note: Various places expect the allocated memory to be zeroed. */