Ensure all headers have `#pragma once` and are in API docs

`///@file` makes them show up in the internal API dos. A tiny few were
missing `#pragma once`.

20 files changed, 22 insertions, 0 deletions

diff --git a/src/libexpr/attr-path.hh b/src/libexpr/attr-path.hh
index 117e0051b..d0d05b1a1 100644
--- a/src/libexpr/attr-path.hh
+++ b/src/libexpr/attr-path.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "eval.hh"
 
diff --git a/src/libexpr/attr-set.hh b/src/libexpr/attr-set.hh
index dcc73b506..3fe54408b 100644
--- a/src/libexpr/attr-set.hh
+++ b/src/libexpr/attr-set.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "nixexpr.hh"
 #include "symbol-table.hh"
diff --git a/src/libexpr/eval-cache.hh b/src/libexpr/eval-cache.hh
index c93e55b93..c90882edc 100644
--- a/src/libexpr/eval-cache.hh
+++ b/src/libexpr/eval-cache.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "sync.hh"
 #include "hash.hh"
diff --git a/src/libexpr/eval-inline.hh b/src/libexpr/eval-inline.hh
index f0da688db..f8ddd2acc 100644
--- a/src/libexpr/eval-inline.hh
+++ b/src/libexpr/eval-inline.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "eval.hh"
 
diff --git a/src/libexpr/eval.hh b/src/libexpr/eval.hh
index e4d5906bd..a1b54951e 100644
--- a/src/libexpr/eval.hh
+++ b/src/libexpr/eval.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "attr-set.hh"
 #include "types.hh"
diff --git a/src/libexpr/flake/flake.hh b/src/libexpr/flake/flake.hh
index 10301d8aa..3cb39d766 100644
--- a/src/libexpr/flake/flake.hh
+++ b/src/libexpr/flake/flake.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "types.hh"
 #include "flakeref.hh"
diff --git a/src/libexpr/flake/flakeref.hh b/src/libexpr/flake/flakeref.hh
index c4142fc20..23d19adb1 100644
--- a/src/libexpr/flake/flakeref.hh
+++ b/src/libexpr/flake/flakeref.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "types.hh"
 #include "hash.hh"
diff --git a/src/libexpr/flake/lockfile.hh b/src/libexpr/flake/lockfile.hh
index 02e9bdfbc..6512509c5 100644
--- a/src/libexpr/flake/lockfile.hh
+++ b/src/libexpr/flake/lockfile.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "flakeref.hh"
 
diff --git a/src/libexpr/function-trace.hh b/src/libexpr/function-trace.hh
index e9a2526bd..91439b0aa 100644
--- a/src/libexpr/function-trace.hh
+++ b/src/libexpr/function-trace.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "eval.hh"
 
diff --git a/src/libexpr/get-drvs.hh b/src/libexpr/get-drvs.hh
index bbd2d3c47..51ef7782a 100644
--- a/src/libexpr/get-drvs.hh
+++ b/src/libexpr/get-drvs.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "eval.hh"
 #include "path.hh"
diff --git a/src/libexpr/json-to-value.hh b/src/libexpr/json-to-value.hh
index 84bec4eba..3b8ec000f 100644
--- a/src/libexpr/json-to-value.hh
+++ b/src/libexpr/json-to-value.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "eval.hh"
 
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 4a81eaa47..4079a7b24 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include <map>
 #include <vector>
diff --git a/src/libexpr/primops.hh b/src/libexpr/primops.hh
index 1cfb4356b..1c5ce219f 100644
--- a/src/libexpr/primops.hh
+++ b/src/libexpr/primops.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "eval.hh"
 
diff --git a/src/libexpr/symbol-table.hh b/src/libexpr/symbol-table.hh
index 288c15602..c97a0a2db 100644
--- a/src/libexpr/symbol-table.hh
+++ b/src/libexpr/symbol-table.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include <list>
 #include <map>
diff --git a/src/libexpr/tests/libexpr.hh b/src/libexpr/tests/libexpr.hh
index 8534d9567..69c932f05 100644
--- a/src/libexpr/tests/libexpr.hh
+++ b/src/libexpr/tests/libexpr.hh
@@ -1,3 +1,6 @@
+#pragma once
+///@file
+
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
 
diff --git a/src/libexpr/tests/value/context.hh b/src/libexpr/tests/value/context.hh
index 54d21760e..c0bc97ba3 100644
--- a/src/libexpr/tests/value/context.hh
+++ b/src/libexpr/tests/value/context.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include <rapidcheck/gen/Arbitrary.h>
 
diff --git a/src/libexpr/value-to-json.hh b/src/libexpr/value-to-json.hh
index 22f26b790..713356c7f 100644
--- a/src/libexpr/value-to-json.hh
+++ b/src/libexpr/value-to-json.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "nixexpr.hh"
 #include "eval.hh"
diff --git a/src/libexpr/value-to-xml.hh b/src/libexpr/value-to-xml.hh
index 506f32b6b..ace7ead0f 100644
--- a/src/libexpr/value-to-xml.hh
+++ b/src/libexpr/value-to-xml.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "nixexpr.hh"
 #include "eval.hh"
diff --git a/src/libexpr/value.hh b/src/libexpr/value.hh
index 508dbe218..bfae4ee94 100644
--- a/src/libexpr/value.hh
+++ b/src/libexpr/value.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include <cassert>
 
diff --git a/src/libexpr/value/context.hh b/src/libexpr/value/context.hh
index 721563cba..d467b4f1d 100644
--- a/src/libexpr/value/context.hh
+++ b/src/libexpr/value/context.hh
@@ -1,4 +1,5 @@
 #pragma once
+///@file
 
 #include "util.hh"
 #include "comparator.hh"