#2258 "unrecognized option" is printed at every error

[Daniel Molina García]

If I execute gnuplot 5.2.6 from command line (in GNU/Linux) like

gnuplot -v

last line printed is

unrecognized option -v

That is reasonable. However, whenever I type something incorrect the message appears again

gnuplot> a=
           ^
         constant expression required

unrecognized option -v

I think that that is not intended.

[Ethan Merritt]

I can't reproduce this here with either 5.2.6 or current 5.2.8
Is there any other information you can provide about the sequence of commands?

[Daniel Molina García]

I reproduced it in 5.2.8 of Termux for Android too. I paste everything. II hope newlines are correctly placed

$ gnuplot -v        G N U P L O T        Version 5.2 patchlevel 8    last modified 2019-12-01        Copyright (C) 1986-1993, 1998, 2004, 2007-2019        Thomas Williams, Colin Kelley and many others        gnuplot home:     http://www.gnuplot.info        faq, bugs, etc:   type "help FAQ"        immediate help:   type "help"  (plot window: hit 'h')Terminal type is now 'unknown'unrecognized option -vgnuplot> a=           ^         constant expression requiredunrecognized option -vgnuplot>

[Ethan Merritt]

Strange. Could you paste here the output from "show version long"? Maybe that will provide another clue.

[Daniel Molina García]

$ gnuplot -s

    G N U P L O T
    Version 5.2 patchlevel 6    last modified 2019-01-01 

    Copyright (C) 1986-1993, 1998, 2004, 2007-2018
    Thomas Williams, Colin Kelley and many others

    gnuplot home:     http://www.gnuplot.info
    faq, bugs, etc:   type "help FAQ"
    immediate help:   type "help"  (plot window: hit 'h')

Terminal type is now 'qt'
unrecognized option -s
gnuplot> show version long

    G N U P L O T
    Version 5.2 patchlevel 6    last modified 2019-01-01 

    Copyright (C) 1986-1993, 1998, 2004, 2007-2018
    Thomas Williams, Colin Kelley and many others

    gnuplot home:     http://www.gnuplot.info
    faq, bugs, etc:   type "help FAQ"
    immediate help:   type "help"  (plot window: hit 'h')

Compile options:
    -READLINE  +LIBEDITLINE  +HISTORY  
    -BACKWARDS_COMPATIBILITY  +OBJECTS  +STATS +EXTERNAL_FUNCTIONS 
    +GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION  
    -USE_CWDRC  +X11  +X11_EXTERNAL +USE_MOUSE  +HIDDEN3D_QUADTREE  
    MAX_PARALLEL_AXES=13

GNUPLOT_DRIVER_DIR = "/usr/lib/gnuplot"
GNUPLOT_PS_DIR     = "/usr/share/gnuplot/gnuplot/5.2/PostScript"
HELPFILE           = "/usr/share/gnuplot/gnuplot.gih"

gnuplot> a=
           ^
         constant expression required

unrecognized option -s

[Ethan Merritt]

Thanks. That does give a hint.
I'm guessing the bug is specific to the use of libeditline, which is the least-used and least-tested of the three options you have for building gnuplot with a command-line editor. I don't know whether the bug is in the library itself or in gnuplot's use of the library API. I will leave this issue open so that the next time one of the developers is looking at the libeditline code they can keep it in mind.

[Ethan Merritt]

Nope. I can't reproduce it using libeditline. Scratch that idea.