Add a hack to find "chart" executable

bin/bench.sh

@@ -70,7 +70,19 @@ cabal_which_report() {
   local path=$(cabal_which streamly-benchmarks x $1)
   if test -z "$path"
   then
-    cabal_which_builddir dist-newstyle streamly-benchmarks x $1
+    echo "Cannot find $1 executable, trying in dist-newstyle" 1>&2
+    local path1=$(cabal_which_builddir dist-newstyle streamly-benchmarks x $1)
+    if test -z "$path1"
+    then
+      local path2="./bin/$1"
+      echo "Cannot find $1 executable, trying $path2" 1>&2
+      if test -e "$path2"
+      then
+        echo $path2
+      fi
+    else
+        echo $path1
+    fi
   else
     echo $path
   fi

default.nix

@@ -3,6 +3,13 @@
 # To build the chart executable for running bench.sh use:
 # nix-shell --argstr c2nix "--flag dev" --run "cabal build chart --flag dev"
 #
+# You can permanently copy the "chart" executable to "./bin" to pick
+# it up irrespective of the compiler/build. Its path is printed by the
+# above build command. You can also print its path using the following
+# command and then use "cp <path> ./bin" to copy it to "./bin", the bench.sh
+# script will pick it up from there:
+# nix-shell --argstr c2nix "--flag dev" --run "cabal exec --flag dev -- which chart"
+#
 # To use ghc-8.6.5
 # nix-shell --argstr compiler "ghc865"