Merge pull request #9634 from 9999years/combine-abstract-pos-and-pos

Combine `AbstractPos`, `PosAdapter`, and `Pos`

(cherry picked from commit 113499d16fc87d53b73fb62fe6242154909756ed)

===

this is a bit cursed because originally it was based on InputAccessor
code that we don't have and moved/patched features we likewise don't
have (fetchToStore caching, all the individual accessors,
ContentAddressMethod). the commit is adjusted accordingly to
match (remove caching, ignore accessors, use FileIngestionMethod).

note that `state.rootPath . CanonPath == abs` and
computeStorePathForPath works relative to cwd, so the slight rewrite in
the moved fetchToStore is legal.

Change-Id: I05fd340c273f0bcc8ffabfebdc4a88b98083bce5

src/libcmd/editor-for.cc

@@ -1,5 +1,6 @@
 #include "util.hh"
 #include "editor-for.hh"
+#include "source-path.hh"
 
 namespace nix {
 

src/libcmd/editor-for.hh

@@ -2,7 +2,7 @@
 ///@file
 
 #include "types.hh"
-#include "input-accessor.hh"
+#include "source-path.hh"
 
 namespace nix {
 

src/libcmd/installable-value.cc

@@ -1,5 +1,6 @@
 #include "installable-value.hh"
 #include "eval-cache.hh"
+#include "fetch-to-store.hh"
 
 namespace nix {
 
@@ -44,7 +45,7 @@ ref<InstallableValue> InstallableValue::require(ref<Installable> installable)
 std::optional<DerivedPathWithInfo> InstallableValue::trySinglePathToDerivedPaths(Value & v, const PosIdx pos, std::string_view errorCtx)
 {
     if (v.type() == nPath) {
-        auto storePath = v.path().fetchToStore(state->store);
+        auto storePath = fetchToStore(*state->store, v.path());
         return {{
             .path = DerivedPath::Opaque {
                 .path = std::move(storePath),

src/libcmd/repl.cc

@@ -218,7 +218,7 @@ static std::ostream & showDebugTrace(std::ostream & out, const PosTable & positi
     // prefer direct pos, but if noPos then try the expr.
     auto pos = dt.pos
         ? dt.pos
-        : static_cast<std::shared_ptr<AbstractPos>>(positions[dt.expr.getPos() ? dt.expr.getPos() : noPos]);
+        : positions[dt.expr.getPos() ? dt.expr.getPos() : noPos];
 
     if (pos) {
         out << *pos;