Add Base.active_manifest()

Author: IanButterworth

NEWS.md

@@ -25,7 +25,8 @@ New library functions
 New library features
 --------------------
 
-`sort(keys(::Dict))` and `sort(values(::Dict))` now automatically collect, they previously threw ([#56978]).
+* `sort(keys(::Dict))` and `sort(values(::Dict))` now automatically collect, they previously threw ([#56978]).
+* New `Base.active_manifest()` function to return the path of the active manifest, like `Base.active_project()` ([#])
 
 Standard library changes
 ------------------------

base/initdefs.jl

@@ -379,6 +379,21 @@ function set_active_project(projfile::Union{AbstractString,Nothing})
     end
 end
 
+"""
+    active_manifest()
+
+Return the path of the active manifest file. See [`Project environments`](@ref) for
+details on the difference between a project and a manifest, and the naming options and
+their priority when searching for a manifest file.
+
+See also [`Base.active_project`](@ref), [`Base.set_active_project`](@ref).
+"""
+function active_manifest(search_load_path::Bool=true)
+    proj = active_project(search_load_path)
+    proj === nothing && return nothing
+    return project_file_manifest_path(proj)
+end
+
 
 """
     load_path()

base/loading.jl

@@ -827,6 +827,7 @@ function project_file_manifest_path(project_file::String)::Union{Nothing,String}
         manifest_path === missing || return manifest_path
     end
     dir = abspath(dirname(project_file))
+    isfile_casesensitive(project_file) || return nothing
     d = parsed_toml(project_file)
     base_manifest = workspace_manifest(project_file)
     if base_manifest !== nothing

base/public.jl

@@ -50,6 +50,7 @@ public
     DL_LOAD_PATH,
     load_path,
     active_project,
+    active_manifest,
 
 # Reflection and introspection
     isambiguous,

doc/src/base/base.md

@@ -44,6 +44,7 @@ ans
 err
 Base.active_project
 Base.set_active_project
+Base.active_manifest
 ```
 
 ## [Keywords](@id Keywords)