show the outs with oizys cache before building

pkgs/oizys/src/oizys/nix.nim

@@ -367,6 +367,12 @@ proc reportResults(results: seq[(OizysDerivation, BuildResult)]) =
   output.writeLine rows.join("\n")
   close output
 
+proc prettyDerivation*(path: string): BbString =
+  const maxLen = 40
+  let drv = path.toDerivation()
+  drv.name.trunc(maxLen) & " " & drv.hash.bb("faint")
+
+
 proc nixBuildWithCache*(name: string, rest:seq[string], service: string, jobs: int) =
   ## build individual derivations not cached and push to cache
   if findExe(service) == "": fatalQuit fmt"is {service} installed?"
@@ -377,6 +383,8 @@ proc nixBuildWithCache*(name: string, rest:seq[string], service: string, jobs: i
     info "nothing to build"
     quit "exiting...", QuitSuccess
 
+  info fmt("building {drvs.len} derivations:\n") & drvs.mapIt(prettyDerivation(it.drv.outputs["out"].path)).join("\n")
+
   let results =
     collect:
       for drv in drvs:

pkgs/oizys/src/oizys/utils.nim

@@ -56,11 +56,6 @@ proc hasNarinfo*(cache: string, path: string): Opt[string] =
   finally:
     client.close()
 
-proc prettyDerivation(path: string): BbString =
-  const maxLen = 40
-  let drv = path.toDerivation()
-  drv.name.trunc(maxLen) & " " & drv.hash.bb("faint")
-
 proc showNarInfo(s: string): BbString =
   let maxWidth = terminalWidth()
   result.add "narinfo:"