name histogram output files and option to keep files

slurm-eff-tool.py

@@ -1490,7 +1490,7 @@ def histo_graphs(out_rows: list[OutputRow], args: argparse.Namespace):
 
     if term in ("svg", "png"):
         width, height = 900, 600
-        outfileroot="./histo-out"
+        outfileroot = args.hprefix
         plotstyle = ('set style fill transparent solid 0.35 noborder\n'
                      'set grid')
         linestyle = "with boxes"
@@ -1572,7 +1572,13 @@ def histo_graphs(out_rows: list[OutputRow], args: argparse.Namespace):
         except FileNotFoundError:
             sys.stderr.write("ERROR: Cannot execute gnuplot for histogram creation. Is it installed?\n")
             sys.exit(1)
-        os.remove(tmpfile.name)
+
+        if not args.hkeepfiles:
+            os.remove(tmpfile.name)
+        else:
+            gpltfname = os.path.splitext(tmpfile.name)[0] + ".gplot"
+            with open(gpltfname, "w", newline="", encoding="utf-8") as f:
+                f.write(gnuplot_cmd)
     
 # HISTOGRAMMING CODE END
 
@@ -1657,10 +1663,16 @@ def parse_args(argv: list[str]) -> argparse.Namespace:
     p.add_argument("-s", "--sort", help="comma-separated numeric sort columns or short aliases; prefix with - for descending.")
     p.add_argument("--expr", help="filter using an arithmetic expression using column names as variables (case insensitive). Don't use for state (use --state flag instead).",
                    default=None)
+
+    # Histogramming
     p.add_argument("-H", "--histo", help=f"print histogram of the given metric (Supported columns: {', '.join(HISTO_COLUMNS)}).", default=None)
     p.add_argument("--hlogy", action="store_true", help="use logscale for histogram y axis")
     p.add_argument("--hterm", help=f"terminal type to plot histogram to.",
                    default="dumb", choices=("dumb", "png", "svg"))
+    p.add_argument("--hprefix", help="prefix for output histogram files",
+                   default="histo-slurm-eff-tool-histo-")
+    p.add_argument("--hkeepfiles",help="keep gnuplot command and data files",
+                   action="store_true", default=False)
 
     # Options for writing/reading cache files
     p.add_argument("-B", "--write-binary-cache", help="write a binary cache file in gzipped msgpack format")