WIP add dryrun for printing out what test would be run

Author: nickrobinson251

Diff for: src/ReTestItems.jl

@@ -332,8 +332,14 @@ function _runtests_in_current_env(
     testitems, _ = include_testfiles!(proj_name, projectfile, paths, ti_filter, verbose_results, report)
     ntestitems = length(testitems.testitems)
     @debugv 1 "Done including tests in $paths"
-    @info "Finished scanning for test items in $(round(time() - inc_time, digits=2)) seconds." *
-        " Scheduling $ntestitems tests on pid $(Libc.getpid())" *
+    @info "Finished scanning for test items in $(round(time() - inc_time, digits=2)) seconds."
+    # TODO: make this a keyword to `runtests` that gets passed to `_runtests_in_current_env`
+    dryrun = parse(Bool, get(ENV, "RETESTITEMS_DRYRUN", "false"))::Bool
+    if dryrun
+        print_testitems(testitems)
+        return nothing
+    end
+    @info "Scheduling $ntestitems tests on pid $(Libc.getpid())" *
         (nworkers == 0 ? "" : " with $nworkers worker processes and $nworker_threads threads per worker.")
     try
         if nworkers == 0

Diff for: src/testcontext.jl

@@ -94,6 +94,29 @@ end
 
 TestItems(graph) = TestItems(graph, TestItem[], 0)
 
+function print_testitems(tis::TestItems)
+    ntestitems = length(tis.testitems)
+    if ntestitems == 0
+        printstyled("No test items found\n"; bold=true)
+        return nothing
+    end
+    plural = ntestitems == 1 ? "" : "s"
+    printstyled("$ntestitems test item$plural found:\n"; bold=true)
+    print_testitems(tis.graph)
+end
+function print_testitems(dir::DirNode, indent::Int=0)
+    println("  "^indent, dir.path)
+    for child in dir.children
+        print_testitems(child, indent + 1)
+    end
+end
+function print_testitems(file::FileNode, indent::Int=0)
+    println("  "^indent, file.path)
+    for ti in file.testitems
+        printstyled("  "^(indent+1), ti.name, "\n"; bold=true)
+    end
+end
+
 ###
 ### record results
 ###