diff --git a/docs/Manifest.toml b/docs/Manifest.toml
index 8822535..32b3c74 100644
--- a/docs/Manifest.toml
+++ b/docs/Manifest.toml
@@ -34,9 +34,9 @@ version = "1.1.0"
 
 [[DataStructures]]
 deps = ["InteractiveUtils", "OrderedCollections"]
-git-tree-sha1 = "1fe8fad5fc84686dcbc674aa255bc867a64f8132"
+git-tree-sha1 = "a1b652fb77ae8ca7ea328fa7ba5aa151036e5c10"
 uuid = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
-version = "0.17.5"
+version = "0.17.6"
 
 [[Dates]]
 deps = ["Printf"]
@@ -58,9 +58,9 @@ version = "0.8.1"
 
 [[Documenter]]
 deps = ["Base64", "Dates", "DocStringExtensions", "InteractiveUtils", "JSON", "LibGit2", "Logging", "Markdown", "REPL", "Test", "Unicode"]
-git-tree-sha1 = "0e52069b5970cb27234153f578227947565152c5"
+git-tree-sha1 = "7f6ad432deb42aa108bc79205ee96d28724b084f"
 uuid = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
-version = "0.24.0"
+version = "0.24.1"
 
 [[FFMPEG]]
 deps = ["BinaryProvider", "Libdl"]
@@ -74,10 +74,10 @@ uuid = "53c48c17-4a7d-5ca2-90c5-79b7896eea93"
 version = "0.6.1"
 
 [[GR]]
-deps = ["Base64", "DelimitedFiles", "LinearAlgebra", "Pkg", "Printf", "Random", "Serialization", "Sockets", "Test"]
-git-tree-sha1 = "2b29ed254586324366e43f4283880978e6956d1f"
+deps = ["Base64", "DelimitedFiles", "LinearAlgebra", "Printf", "Random", "Serialization", "Sockets", "Test"]
+git-tree-sha1 = "c690c2ab22ac9ee323d9966deae61a089362b25c"
 uuid = "28b8d3ca-fb5f-59d9-8090-bfdbd6d07a71"
-version = "0.42.0"
+version = "0.44.0"
 
 [[GeometryTypes]]
 deps = ["ColorTypes", "FixedPointNumbers", "IterTools", "LinearAlgebra", "StaticArrays"]
@@ -173,9 +173,9 @@ version = "0.6.1"
 
 [[Plots]]
 deps = ["Base64", "Contour", "Dates", "FFMPEG", "FixedPointNumbers", "GR", "GeometryTypes", "JSON", "LinearAlgebra", "Measures", "NaNMath", "Pkg", "PlotThemes", "PlotUtils", "Printf", "REPL", "Random", "RecipesBase", "Reexport", "Requires", "Showoff", "SparseArrays", "Statistics", "StatsBase", "UUIDs"]
-git-tree-sha1 = "0d7cf139b508defb467ac4fd655f4bd4d92f30cf"
+git-tree-sha1 = "11c75a31269c1c64790e7cb910346f64cd4440c1"
 uuid = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
-version = "0.27.0"
+version = "0.27.1"
 
 [[Printf]]
 deps = ["Unicode"]
diff --git a/src/Literate.jl b/src/Literate.jl
index 4960394..841294d 100644
--- a/src/Literate.jl
+++ b/src/Literate.jl
@@ -175,56 +175,16 @@ function replace_default(content, sym;
     push!(repls, "@__NAME__" => config["name"]::String)
 
     # fix links
+
     if get(ENV, "DOCUMENTATIONGENERATOR", "") == "true"
         ## DocumentationGenerator.jl
-        ### URL to the root of the deployment, see
-        ### https://github.com/JuliaDocs/DocumentationGenerator.jl/pull/76
         base_url = get(ENV, "DOCUMENTATIONGENERATOR_BASE_URL", "DOCUMENTATIONGENERATOR_BASE_URL")
-        ### replace @__REPO_ROOT_URL__ to master/commit
-        # TODO
-        # repo_root_url = "https://github.com/$(travis_repo_slug)/blob/$(commit)"
-        # push!(repls, "@__REPO_ROOT_URL__" => repo_root_url)
-        ### replace @__NBVIEWER_ROOT_URL__ to dev or version directory
         nbviewer_root_url = "https://nbviewer.jupyter.org/urls/$(base_url)"
         push!(repls, "@__NBVIEWER_ROOT_URL__" => nbviewer_root_url)
-        ### replace @__BINDER_ROOT_URL__ to dev or version directory
-        ### TODO: Binder requires files to be in a git repository :(
-        if match(r"@__BINDER_ROOT_URL__", content) !== nothing
-            @warn("mybinder.org requires the notebook to be in a git repository, " *
-                  "which does not work with DocumentationGenerator.jl")
-        end
-    elseif haskey(ENV, "HAS_JOSH_K_SEAL_OF_APPROVAL") || haskey(ENV, "GITHUB_ACTION")
-        ## Travis CI / GitHub Actions
-        ### Use same logic as Documenter to figure out the deploy folder
-        repo_slug = get(ENV, "TRAVIS_REPO_SLUG", get(ENV, "GITHUB_REPOSITORY", "REPO_SLUG"))
-        tag = get(ENV, "TRAVIS_TAG") do
-            github_ref = get(ENV, "GITHUB_REF", nothing)
-            github_ref === nothing && return nothing
-            m = match(r"^refs/tags/(.*)$", github_ref)
-            m === nothing && return nothing
-            return String(m.captures[1])
-        end
-        ### use the versioned directory for links, even for the stable
-        ### and release folders since these will not change
-        folder = (tag === nothing || isempty(tag)) ? "dev" : tag
-        ### replace @__REPO_ROOT_URL__ to master/commit
-        repo_root_url = "https://github.com/$(repo_slug)/blob/$(commit)"
-        push!(repls, "@__REPO_ROOT_URL__" => repo_root_url)
-        ### replace @__NBVIEWER_ROOT_URL__ to dev or version directory
-        nbviewer_root_url = "https://nbviewer.jupyter.org/github/$(repo_slug)/blob/$(branch)/$(folder)"
-        push!(repls, "@__NBVIEWER_ROOT_URL__" => nbviewer_root_url)
-        ### replace @__BINDER_ROOT_URL__ to dev or version directory
-        binder_root_url = "https://mybinder.org/v2/gh/$(repo_slug)/$(branch)?filepath=$(folder)"
-        push!(repls, "@__BINDER_ROOT_URL__" => binder_root_url)
     else
-        ## Warn about broken link expansions
-        if (match(r"@__REPO_ROOT_URL__", content)     !== nothing) ||
-           (match(r"@__NBVIEWER_ROOT_URL__", content) !== nothing) ||
-           (match(r"@__BINDER_ROOT_URL__", content)   !== nothing)
-           @warn("expansion of `@__REPO_ROOT_URL__`, `@__NBVIEWER_ROOT_URL__` and " *
-                 " `@__BINDER_ROOT_URL__` will only be correct if running from " *
-                 "DocumentationGenerator.jl, Travis CI or GitHub Actions.")
-        end
+        push!(repls, "@__REPO_ROOT_URL__" => get(config, "repo_root_url", "<unknown>"))
+        push!(repls, "@__NBVIEWER_ROOT_URL__" => get(config, "nbviewer_root_url", "<unknown>"))
+        push!(repls, "@__BINDER_ROOT_URL__" => get(config, "binder_root_url", "<unknown>"))
     end
 
     # run some Documenter specific things
@@ -262,6 +222,53 @@ function create_configuration(inputfile; user_config, user_kwargs)
     cfg["codefence"] = get(user_config, "documenter", true) ?
         ("```@example $(get(user_config, "name", cfg["name"]))" => "```") : ("```julia" => "```")
     cfg["execute"] = true
+    # Guess the package (or repository) root url
+    edit_commit = "master" # TODO: Make this configurable like Documenter?
+    deploy_branch = "gh-pages" # TODO: Make this configurable like Documenter?
+    if haskey(ENV, "HAS_JOSH_K_SEAL_OF_APPROVAL") # Travis CI
+        repo_slug = get(ENV, "TRAVIS_REPO_SLUG", "unknown-repository")
+        deploy_folder = if get(ENV, "TRAVIS_PULL_REQUEST", nothing) == "false"
+            get(ENV, "TRAVIS_TAG", get(user_config, "devurl", "dev"))
+        else
+            "previews/PR$(get(ENV, "TRAVIS_PULL_REQUEST", "##"))"
+        end
+        cfg["repo_root_url"] = "https://github.com/$(repo_slug)/blob/$(edit_commit)"
+        cfg["nbviewer_root_url"] = "https://nbviewer.jupyter.org/github/$(repo_slug)/blob/$(deploy_branch)/$(deploy_folder)"
+        cfg["binder_root_url"] = "https://mybinder.org/v2/gh/$(repo_slug)/$(deploy_branch)?filepath=$(deploy_folder)"
+        if (dir = get(ENV, "TRAVIS_BUILD_DIR", nothing)) !== nothing
+            cfg["repo_root_path"] = dir
+        end
+    elseif haskey(ENV, "GITHUB_ACTIONS")
+        repo_slug = get(ENV, "GITHUB_REPOSITORY", "unknown-repository")
+        deploy_folder = if get(ENV, "GITHUB_EVENT_NAME", nothing) == "push"
+            if (m = match(r"^refs\/tags\/(.*)$", get(ENV, "GITHUB_REF", ""))) !== nothing
+                String(m.captures[1])
+            else
+                get(user_config, "devurl", "dev")
+            end
+        elseif (m = match(r"refs\/pull\/(\d+)\/merge", get(ENV, "GITHUB_REF", ""))) !== nothing
+            "previews/PR$(m.captures[1])"
+        else
+            "dev"
+        end
+        cfg["repo_root_url"] = "https://github.com/$(repo_slug)/blob/$(edit_commit)"
+        cfg["nbviewer_root_url"] = "https://nbviewer.jupyter.org/github/$(repo_slug)/blob/$(deploy_branch)/$(deploy_folder)"
+        cfg["binder_root_url"] = "https://mybinder.org/v2/gh/$(repo_slug)/$(deploy_branch)?filepath=$(deploy_folder)"
+        if (dir = get(ENV, "GITHUB_WORKSPACE", nothing)) !== nothing
+            cfg["repo_root_path"] = dir
+        end
+    elseif haskey(ENV, "GITLAB_CI")
+        if (url = get(ENV, "CI_PROJECT_URL", nothing)) !== nothing
+            cfg["repo_root_url"] = "$(url)/blob/$(edit_commit)"
+        end
+        if (url = get(ENV, "CI_PAGES_URL", nothing)) !== nothing &&
+           (m = match(r"https://(.+)", url)) !== nothing
+            cfg["nbviewer_root_url"] = "https://nbviewer.jupyter.org/urls/$(m[1])"
+        end
+        if (dir = get(ENV, "CI_PROJECT_DIR", nothing)) !== nothing
+            cfg["repo_root_path"] = dir
+        end
+    end
 
     # Merge default_config with user_config
     merge!(cfg, user_config)
@@ -285,6 +292,11 @@ See the manual section about [Configuration](@ref) for more information.
 | `keep_comments` | When `true`, keeps markdown lines as comments in the output script. | `false` | Only applicable for `Literate.script`. |
 | `codefence` | Pair containing opening and closing fence for wrapping code blocks. | `````"```julia" => "```"````` | If `documenter` is `true` the default is `````"```@example"=>"```"`````. |
 | `execute` | Whether to execute and capture the output. | `true` | Only applicable for `Literate.notebook`. |
+| `devurl` | URL for "in-development" docs. | `"dev"` | See [Documenter docs](https://juliadocs.github.io/Documenter.jl/). Unused if `repo_root_url`/`nbviewer_root_url`/`binder_root_url` are set. |
+| `repo_root_url` | URL to the root of the repository. | - | Determined automatically on Travis CI, GitHub Actions and GitLab CI. Used for `@__REPO_ROOT_URL__`. |
+| `nbviewer_root_url` | URL to the root of the repository as seen on nbviewer. | - | Determined automatically on Travis CI, GitHub Actions and GitLab CI. Used for `@__NBVIEWER_ROOT_URL__`. |
+| `binder_root_url` | URL to the root of the repository as seen on mybinder. | - | Determined automatically on Travis CI, GitHub Actions and GitLab CI. Used for `@__BINDER_ROOT_URL__`. |
+| `repo_root_path` | Filepath to the root of the repository. | - | Determined automatically on Travis CI, GitHub Actions and GitLab CI. Used for computing [Documenters `EditURL`](@ref Interaction-with-Documenter). |
 """
 const DEFAULT_CONFIGURATION=nothing # Dummy const for documentation
 
@@ -377,20 +389,8 @@ function markdown(inputfile, outputdir; config::Dict=Dict(), kwargs...)
     # run some Documenter specific things
     if config["documenter"]::Bool
         # change the Edit on GitHub link
-        repo = get(ENV, "TRAVIS_REPO_SLUG", get(ENV, "GITHUB_REPOSITORY", nothing))
-        if repo === nothing
-            path = ""
-        else
-            pkg = String(first(split(last(split(repo, '/')), '.')))
-            pkgsrc = Base.find_package(pkg)
-            if pkgsrc === nothing
-                path = ""
-            else
-                repo_root = first(split(pkgsrc, joinpath("src", pkg * ".jl")))
-                path = relpath(inputfile, repo_root)
-                path = replace(path, "\\" => "/")
-            end
-        end
+        path = relpath(inputfile, get(config, "repo_root_path", pwd())::String)
+        path = replace(path, "\\" => "/")
         content = """
         # ```@meta
         # EditURL = "@__REPO_ROOT_URL__/$(path)"
diff --git a/test/runtests.jl b/test/runtests.jl
index 4051dcc..63d35b2 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -237,9 +237,31 @@ content = """
     #nb # # Explicit markdown cell with metadata
     """
 
-const expansion_warning = get(ENV, "HAS_JOSH_K_SEAL_OF_APPROVAL", "") == "true" ? () : (:warn, r"expansion of")
-
-@testset "Literate.script" begin
+const TRAVIS_ENV = Dict(
+    "TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
+    "TRAVIS_TAG" => "v1.2.0",
+    "TRAVIS_PULL_REQUEST" => "false",
+    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true",
+    "TRAVIS_BUILD_DIR" => normpath(joinpath(@__DIR__, "..")),
+)
+const ACTIONS_ENV = Dict(
+    "GITHUB_ACTIONS" => "true",
+    "GITHUB_ACTION" => "Build docs",
+    "GITHUB_REPOSITORY" => "fredrikekre/Literate.jl",
+    "GITHUB_EVENT_NAME" => "push",
+    "GITHUB_REF" => "refs/tags/v1.2.0",
+    "GITHUB_WORKSPACE" => normpath(joinpath(@__DIR__, "..")),
+    (k => nothing for k in keys(TRAVIS_ENV))...,
+)
+const GITLAB_ENV = Dict(
+    "GITLAB_CI" => "true",
+    "CI_PROJECT_URL" => "https://gitlab.com/fredrikekre/Literate.jl",
+    "CI_PAGES_URL" => "https://fredrikekre.gitlab.io/Literate.jl",
+    "CI_PROJECT_DIR" => normpath(joinpath(@__DIR__, "..")),
+    (k => nothing for k in keys(TRAVIS_ENV))...,
+    (k => nothing for k in keys(ACTIONS_ENV))...,
+)
+@testset "Literate.script" begin; Base.CoreLogging.with_logger(Base.CoreLogging.NullLogger()) do
     mktempdir(@__DIR__) do sandbox
         cd(sandbox) do
             # write content to inputfile
@@ -248,9 +270,7 @@ const expansion_warning = get(ENV, "HAS_JOSH_K_SEAL_OF_APPROVAL", "") == "true"
             outdir = mktempdir(pwd())
 
             # test defaults
-            withenv("TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
-                    "TRAVIS_TAG" => "v1.2.0",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true") do
+            withenv(TRAVIS_ENV...) do
                 Literate.script(inputfile, outdir)
             end
             expected_script = """
@@ -290,54 +310,70 @@ const expansion_warning = get(ENV, "HAS_JOSH_K_SEAL_OF_APPROVAL", "") == "true"
             script = read(joinpath(outdir, "inputfile.jl"), String)
             @test script == expected_script
 
-            # no tag -> latest directory
-            withenv("TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
-                    "TRAVIS_TAG" => "",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true") do
+            # Travis with with PR preview build
+            withenv(TRAVIS_ENV...,
+                    "TRAVIS_TAG" => nothing,
+                    "TRAVIS_PULL_REQUEST" => "42") do
                 Literate.script(inputfile, outdir)
             end
             script = read(joinpath(outdir, "inputfile.jl"), String)
-            @test occursin("fredrikekre/Literate.jl/blob/gh-pages/dev/", script)
+            @test occursin("# Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", script)
+            @test occursin("# Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/previews/PR42/file.jl", script)
+            @test occursin("# Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=previews/PR42/file.jl", script)
 
-            # GitHub Actions with a tag
-            withenv("GITHUB_ACTION" => "Build docs",
-                    "GITHUB_REPOSITORY" => "fredrikekre/Literate.jl",
-                    "GITHUB_REF" => "refs/tags/v1.2.0",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => nothing,
-                    "TRAVIS_REPO_SLUG" => nothing,
+            # Travis with no tag -> dev directory
+            withenv(TRAVIS_ENV...,
                     "TRAVIS_TAG" => nothing) do
                 Literate.script(inputfile, outdir)
             end
             script = read(joinpath(outdir, "inputfile.jl"), String)
-            @test occursin("fredrikekre/Literate.jl/blob/gh-pages/v1.2.0/", script)
+            @test occursin("# Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", script)
+            @test occursin("# Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/dev/file.jl", script)
+            @test occursin("# Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=dev/file.jl", script)
 
-            # GitHub Actions without a tag
-            withenv("GITHUB_ACTION" => "Build docs",
-                    "GITHUB_REPOSITORY" => "fredrikekre/Literate.jl",
-                    "GITHUB_REF" => "refs/heads/master",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => nothing,
-                    "TRAVIS_REPO_SLUG" => nothing,
-                    "TRAVIS_TAG" => nothing) do
+            # GitHub Actions with a tag
+            withenv(ACTIONS_ENV...) do
                 Literate.script(inputfile, outdir)
             end
             script = read(joinpath(outdir, "inputfile.jl"), String)
-            @test occursin("fredrikekre/Literate.jl/blob/gh-pages/dev/", script)
+            @test occursin("# Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", script)
+            @test occursin("# Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/v1.2.0/file.jl", script)
+            @test occursin("# Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=v1.2.0/file.jl", script)
+
+            # GitHub Actions with PR preview build
+            withenv(ACTIONS_ENV...,
+                    "GITHUB_EVENT_NAME" => "pull_request",
+                    "GITHUB_REF" => "refs/pull/42/merge") do
+                Literate.script(inputfile, outdir)
+            end
+            script = read(joinpath(outdir, "inputfile.jl"), String)
+            @test occursin("# Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", script)
+            @test occursin("# Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/previews/PR42/file.jl", script)
+            @test occursin("# Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=previews/PR42/file.jl", script)
+
+            # GitHub Actions without a tag -> dev directory
+            withenv(ACTIONS_ENV...,
+                    "GITHUB_REF" => "refs/heads/master") do
+                Literate.script(inputfile, outdir)
+            end
+            script = read(joinpath(outdir, "inputfile.jl"), String)
+            @test occursin("# Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", script)
+            @test occursin("# Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/dev/file.jl", script)
+            @test occursin("# Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=dev/file.jl", script)
 
             # building under DocumentationGenerator.jl
             withenv("DOCUMENTATIONGENERATOR" => "true",
                     "DOCUMENTATIONGENERATOR_BASE_URL" => "pkg.julialang.org/docs/Literate/XPnWG/1.2.0") do
-                @test_logs((:warn, r"mybinder.org"), match_mode=:any,
-                    Literate.script(inputfile, outdir))
+                Literate.script(inputfile, outdir)
             end
             script = read(joinpath(outdir, "inputfile.jl"), String)
             @test occursin("jupyter.org/urls/pkg.julialang.org/docs/Literate/XPnWG/1.2.0/file.jl", script)
             @test_broken occursin("https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", script)
 
             # pre- and post-processing
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.script(inputfile, outdir,
-                    preprocess = x -> replace(x, "PLACEHOLDER3" => "3REDLOHECALP"),
-                    postprocess = x -> replace(x, "PLACEHOLDER4" => "4REDLOHECALP")))
+            Literate.script(inputfile, outdir,
+                preprocess = x -> replace(x, "PLACEHOLDER3" => "3REDLOHECALP"),
+                postprocess = x -> replace(x, "PLACEHOLDER4" => "4REDLOHECALP"))
             script = read(joinpath(outdir, "inputfile.jl"), String)
             @test !occursin("PLACEHOLDER1", script)
             @test !occursin("PLACEHOLDER2", script)
@@ -347,16 +383,14 @@ const expansion_warning = get(ENV, "HAS_JOSH_K_SEAL_OF_APPROVAL", "") == "true"
             @test occursin("4REDLOHECALP", script)
 
             # name
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.script(inputfile, outdir, name = "foobar"))
+            Literate.script(inputfile, outdir, name = "foobar")
             script = read(joinpath(outdir, "foobar.jl"), String)
             @test occursin("name: foobar", script)
             @test !occursin("name: inputfile", script)
             @test !occursin("name: @__NAME__", script)
 
             # keep_comments
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.script(inputfile, outdir, keep_comments = true))
+            Literate.script(inputfile, outdir, keep_comments = true)
             script = read(joinpath(outdir, "inputfile.jl"), String)
             @test occursin("# # Example", script)
             @test occursin("# foo, bar", script)
@@ -366,9 +400,9 @@ const expansion_warning = get(ENV, "HAS_JOSH_K_SEAL_OF_APPROVAL", "") == "true"
             @test_throws ArgumentError Literate.script("nonexistent.jl", outdir)
         end
     end
-end
+end end
 
-@testset "Literate.markdown" begin
+@testset "Literate.markdown" begin; Base.CoreLogging.with_logger(Base.CoreLogging.NullLogger()) do
     mktempdir(@__DIR__) do sandbox
         cd(sandbox) do
             # write content to inputfile
@@ -377,9 +411,7 @@ end
             outdir = mktempdir(pwd())
 
             # test defaults
-            withenv("TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
-                    "TRAVIS_TAG" => "v1.2.0",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true") do
+            withenv(TRAVIS_ENV...) do
                 Literate.markdown(inputfile, outdir)
             end
             expected_markdown = """
@@ -476,54 +508,85 @@ end
             markdown = read(joinpath(outdir, "inputfile.md"), String)
             @test markdown == expected_markdown
 
-            # no tag -> latest directory
-            withenv("TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
-                    "TRAVIS_TAG" => "",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true") do
+            # Travis with PR preview build
+            withenv(TRAVIS_ENV...,
+                    "TRAVIS_TAG" => nothing,
+                    "TRAVIS_PULL_REQUEST" => "42") do
                 Literate.markdown(inputfile, outdir)
             end
             markdown = read(joinpath(outdir, "inputfile.md"), String)
-            @test occursin("fredrikekre/Literate.jl/blob/gh-pages/dev/", markdown)
+            @test occursin("Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", markdown)
+            @test occursin("Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/previews/PR42/file.jl", markdown)
+            @test occursin("Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=previews/PR42/file.jl", markdown)
+            @test occursin("EditURL = \"https://github.com/fredrikekre/Literate.jl/blob/master/test/$(basename(sandbox))/inputfile.jl\"", markdown)
 
-            # GitHub Actions with a tag
-            withenv("GITHUB_ACTION" => "Build docs",
-                    "GITHUB_REPOSITORY" => "fredrikekre/Literate.jl",
-                    "GITHUB_REF" => "refs/tags/v1.2.0",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => nothing,
-                    "TRAVIS_REPO_SLUG" => nothing,
+            # Travis with no tag -> dev directory
+            withenv(TRAVIS_ENV...,
                     "TRAVIS_TAG" => nothing) do
                 Literate.markdown(inputfile, outdir)
             end
             markdown = read(joinpath(outdir, "inputfile.md"), String)
-            @test occursin("fredrikekre/Literate.jl/blob/gh-pages/v1.2.0/", markdown)
+            @test occursin("Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", markdown)
+            @test occursin("Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/dev/file.jl", markdown)
+            @test occursin("Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=dev/file.jl", markdown)
+            @test occursin("EditURL = \"https://github.com/fredrikekre/Literate.jl/blob/master/test/$(basename(sandbox))/inputfile.jl\"", markdown)
 
-            # GitHub Actions without a tag
-            withenv("GITHUB_ACTION" => "Build docs",
-                    "GITHUB_REPOSITORY" => "fredrikekre/Literate.jl",
-                    "GITHUB_REF" => "refs/heads/master",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => nothing,
-                    "TRAVIS_REPO_SLUG" => nothing,
-                    "TRAVIS_TAG" => nothing) do
+            # GitHub Actions with a tag
+            withenv(ACTIONS_ENV...) do
+                Literate.markdown(inputfile, outdir)
+            end
+            markdown = read(joinpath(outdir, "inputfile.md"), String)
+            @test occursin("Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", markdown)
+            @test occursin("Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/v1.2.0/file.jl", markdown)
+            @test occursin("Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=v1.2.0/file.jl", markdown)
+            @test occursin("EditURL = \"https://github.com/fredrikekre/Literate.jl/blob/master/test/$(basename(sandbox))/inputfile.jl\"", markdown)
+
+            # GitHub Actions with PR preview build
+            withenv(ACTIONS_ENV...,
+                    "GITHUB_REF" => "refs/pull/42/merge",
+                    "GITHUB_EVENT_NAME" => "pull_request") do
+                Literate.markdown(inputfile, outdir)
+            end
+            markdown = read(joinpath(outdir, "inputfile.md"), String)
+            @test occursin("Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", markdown)
+            @test occursin("Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/previews/PR42/file.jl", markdown)
+            @test occursin("Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=previews/PR42/file.jl", markdown)
+            @test occursin("EditURL = \"https://github.com/fredrikekre/Literate.jl/blob/master/test/$(basename(sandbox))/inputfile.jl\"", markdown)
+
+            # GitHub Actions without a tag -> dev directory
+            withenv(ACTIONS_ENV...,
+                    "GITHUB_REF" => "refs/heads/master") do
+                Literate.markdown(inputfile, outdir)
+            end
+            markdown = read(joinpath(outdir, "inputfile.md"), String)
+            @test occursin("Link to repo root: https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", markdown)
+            @test occursin("Link to nbviewer: https://nbviewer.jupyter.org/github/fredrikekre/Literate.jl/blob/gh-pages/dev/file.jl", markdown)
+            @test occursin("Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=dev/file.jl", markdown)
+            @test occursin("EditURL = \"https://github.com/fredrikekre/Literate.jl/blob/master/test/$(basename(sandbox))/inputfile.jl\"", markdown)
+
+            # GitLab CI with GitLab Pages
+            withenv(GITLAB_ENV...) do
                 Literate.markdown(inputfile, outdir)
             end
             markdown = read(joinpath(outdir, "inputfile.md"), String)
-            @test occursin("fredrikekre/Literate.jl/blob/gh-pages/dev/", markdown)
+            @test occursin("Link to repo root: https://gitlab.com/fredrikekre/Literate.jl/blob/master/file.jl", markdown)
+            @test occursin("Link to nbviewer: https://nbviewer.jupyter.org/urls/fredrikekre.gitlab.io/Literate.jl/file.jl", markdown)
+            @test_broken occursin("Link to binder: https://mybinder.org/v2/gh/fredrikekre/Literate.jl/gh-pages?filepath=dev/file.jl", markdown)
+            @test occursin("EditURL = \"https://gitlab.com/fredrikekre/Literate.jl/blob/master/test/$(basename(sandbox))/inputfile.jl\"", markdown)
 
             # building under DocumentationGenerator.jl
             withenv("DOCUMENTATIONGENERATOR" => "true",
                     "DOCUMENTATIONGENERATOR_BASE_URL" => "pkg.julialang.org/docs/Literate/XPnWG/1.2.0") do
-                @test_logs((:warn, r"mybinder.org"), match_mode=:any,
-                    Literate.markdown(inputfile, outdir))
+                Literate.markdown(inputfile, outdir)
             end
             markdown = read(joinpath(outdir, "inputfile.md"), String)
             @test occursin("jupyter.org/urls/pkg.julialang.org/docs/Literate/XPnWG/1.2.0/file.jl", markdown)
             @test_broken occursin("https://github.com/fredrikekre/Literate.jl/blob/master/file.jl", markdown)
 
             # pre- and post-processing
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.markdown(inputfile, outdir,
-                    preprocess = x -> replace(replace(x, "PLACEHOLDER1" => "1REDLOHECALP"), "PLACEHOLDER3" => "3REDLOHECALP"),
-                    postprocess = x -> replace(replace(x, "PLACEHOLDER2" => "2REDLOHECALP"), "PLACEHOLDER4" => "4REDLOHECALP")))
+            Literate.markdown(inputfile, outdir,
+                preprocess = x -> replace(replace(x, "PLACEHOLDER1" => "1REDLOHECALP"), "PLACEHOLDER3" => "3REDLOHECALP"),
+                postprocess = x -> replace(replace(x, "PLACEHOLDER2" => "2REDLOHECALP"), "PLACEHOLDER4" => "4REDLOHECALP"))
             markdown = read(joinpath(outdir, "inputfile.md"), String)
             @test !occursin("PLACEHOLDER1", markdown)
             @test !occursin("PLACEHOLDER2", markdown)
@@ -535,8 +598,7 @@ end
             @test occursin("4REDLOHECALP", markdown)
 
             # documenter = false
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.markdown(inputfile, outdir, documenter = false))
+            Literate.markdown(inputfile, outdir, documenter = false)
             markdown = read(joinpath(outdir, "inputfile.md"), String)
             @test occursin("```julia", markdown)
             @test !occursin("```@example", markdown)
@@ -544,16 +606,14 @@ end
             @test !occursin("EditURL", markdown)
 
             # codefence
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.markdown(inputfile, outdir, codefence = "```c" => "```"))
+            Literate.markdown(inputfile, outdir, codefence = "```c" => "```")
             markdown = read(joinpath(outdir, "inputfile.md"), String)
             @test occursin("```c", markdown)
             @test !occursin("```@example", markdown)
             @test !occursin("```julia", markdown)
 
             # name
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.markdown(inputfile, outdir, name = "foobar"))
+            Literate.markdown(inputfile, outdir, name = "foobar")
             markdown = read(joinpath(outdir, "foobar.md"), String)
             @test occursin("```@example foobar", markdown)
             @test !occursin("```@example inputfile", markdown)
@@ -565,9 +625,9 @@ end
             @test_throws ArgumentError Literate.markdown("nonexistent.jl", outdir)
         end
     end
-end
+end end
 
-@testset "Literate.notebook" begin
+@testset "Literate.notebook" begin; Base.CoreLogging.with_logger(Base.CoreLogging.NullLogger()) do
     mktempdir(@__DIR__) do sandbox
         cd(sandbox) do
             # write content to inputfile
@@ -576,9 +636,7 @@ end
             outdir = mktempdir(pwd())
 
             # test defaults
-            withenv("TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
-                    "TRAVIS_TAG" => "v1.2.0",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true") do
+            withenv(TRAVIS_ENV...) do
                 Literate.notebook(inputfile, outdir, execute = false)
             end
             expected_cells = rstrip.((
@@ -731,33 +789,32 @@ end
             end
 
             # no tag -> latest directory
-            withenv("TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
-                    "TRAVIS_TAG" => "",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true") do
+            withenv(TRAVIS_ENV...,
+                    "TRAVIS_TAG" => nothing) do
                 Literate.notebook(inputfile, outdir, execute = false)
             end
             notebook = read(joinpath(outdir, "inputfile.ipynb"), String)
             @test occursin("fredrikekre/Literate.jl/blob/gh-pages/dev/", notebook)
 
             # GitHub Actions with a tag
-            withenv("GITHUB_ACTION" => "Build docs",
-                    "GITHUB_REPOSITORY" => "fredrikekre/Literate.jl",
-                    "GITHUB_REF" => "refs/tags/v1.2.0",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => nothing,
-                    "TRAVIS_REPO_SLUG" => nothing,
-                    "TRAVIS_TAG" => nothing) do
+            withenv(ACTIONS_ENV...) do
                 Literate.notebook(inputfile, outdir, execute = false)
             end
             notebook = read(joinpath(outdir, "inputfile.ipynb"), String)
             @test occursin("fredrikekre/Literate.jl/blob/gh-pages/v1.2.0/", notebook)
 
+            # GitHub Actions with PR preview build
+            withenv(ACTIONS_ENV...,
+                    "GITHUB_REF" => "refs/pull/42/merge",
+                    "GITHUB_EVENT_NAME" => "pull_request") do
+                Literate.notebook(inputfile, outdir, execute = false)
+            end
+            notebook = read(joinpath(outdir, "inputfile.ipynb"), String)
+            @test occursin("fredrikekre/Literate.jl/blob/gh-pages/previews/PR42/", notebook)
+
             # GitHub Actions without a tag
-            withenv("GITHUB_ACTION" => "Build docs",
-                    "GITHUB_REPOSITORY" => "fredrikekre/Literate.jl",
-                    "GITHUB_REF" => "refs/heads/master",
-                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => nothing,
-                    "TRAVIS_REPO_SLUG" => nothing,
-                    "TRAVIS_TAG" => nothing) do
+            withenv(ACTIONS_ENV...,
+                    "GITHUB_REF" => "refs/heads/master") do
                 Literate.notebook(inputfile, outdir, execute = false)
             end
             notebook = read(joinpath(outdir, "inputfile.ipynb"), String)
@@ -766,8 +823,7 @@ end
             # building under DocumentationGenerator.jl
             withenv("DOCUMENTATIONGENERATOR" => "true",
                     "DOCUMENTATIONGENERATOR_BASE_URL" => "pkg.julialang.org/docs/Literate/XPnWG/1.2.0") do
-                @test_logs((:warn, r"mybinder.org"), match_mode=:any,
-                    Literate.notebook(inputfile, outdir, execute = false))
+                Literate.notebook(inputfile, outdir, execute = false)
             end
             notebook = read(joinpath(outdir, "inputfile.ipynb"), String)
             @test occursin("jupyter.org/urls/pkg.julialang.org/docs/Literate/XPnWG/1.2.0/file.jl", notebook)
@@ -783,10 +839,9 @@ end
                 end
                 return nb
             end
-            @test_logs(expansion_warning, match_mode=:any,
                 Literate.notebook(inputfile, outdir, execute = false,
                     preprocess = x -> replace(replace(x, "PLACEHOLDER1" => "1REDLOHECALP"), "PLACEHOLDER3" => "3REDLOHECALP"),
-                    postprocess = post))
+                postprocess = post)
             notebook = read(joinpath(outdir, "inputfile.ipynb"), String)
             @test !occursin("PLACEHOLDER1", notebook)
             @test !occursin("PLACEHOLDER2", notebook)
@@ -798,23 +853,20 @@ end
             @test occursin("4REDLOHECALP", notebook)
 
             # documenter = false
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.notebook(inputfile, outdir, documenter = false, execute = false))
+            Literate.notebook(inputfile, outdir, documenter = false, execute = false)
             notebook = read(joinpath(outdir, "inputfile.ipynb"), String)
             @test occursin("# [Example](@id example-id", notebook)
             @test occursin("[foo](@ref), [bar](@ref bbaarr)", notebook)
 
             # name
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.notebook(inputfile, outdir, name = "foobar", execute = false))
+            Literate.notebook(inputfile, outdir, name = "foobar", execute = false)
             notebook = read(joinpath(outdir, "foobar.ipynb"), String)
             @test occursin("name: foobar", notebook)
             @test !occursin("name: inputfile", notebook)
             @test !occursin("name: @__NAME__", notebook)
 
             # execute = true
-            @test_logs(expansion_warning, match_mode=:any,
-                Literate.notebook(inputfile, outdir))
+            Literate.notebook(inputfile, outdir)
             expected_outputs = rstrip.((
             """
              "cells": [
@@ -877,4 +929,33 @@ end
             @test occursin("\"application/vnd.vegalite.v2+json\":", notebook)
         end
     end
-end
+end end
+
+@testset "Configuration" begin; Base.CoreLogging.with_logger(Base.CoreLogging.NullLogger()) do
+    mktempdir(@__DIR__) do sandbox
+        cd(sandbox) do
+            # write content to inputfile
+            inputfile = "inputfile.jl"
+            write(inputfile, content)
+            outdir = mktempdir(pwd())
+
+            config=Dict(
+                "repo_root_url" => "www.example1.com",
+                "nbviewer_root_url" => "www.example2.com",
+                "binder_root_url" => "www.example3.com",
+            )
+
+            # Overwriting of URLs
+            withenv("TRAVIS_REPO_SLUG" => "fredrikekre/Literate.jl",
+                    "TRAVIS_TAG" => nothing,
+                    "TRAVIS_PULL_REQUEST" => "false",
+                    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true") do
+                Literate.script(inputfile, outdir; config=config)
+            end
+            script = read(joinpath(outdir, "inputfile.jl"), String)
+            @test occursin("Link to repo root: www.example1.com/file.jl", script)
+            @test occursin("Link to nbviewer: www.example2.com/file.jl", script)
+            @test occursin("Link to binder: www.example3.com/file.jl", script)
+        end
+    end
+end end