Automatically set file name of externalized graphics equal to the file name of the tikz/PGF file

As the title says, is it possible to set some options for the externalize library in order to for the filename of the externalized graphics to be equal to the filename of the TikZ-file without using tikzsetnextfilename{} for each and every figure that is to be externalized?

E.g. if I have a file pendulum.tikz, I’d like the externalized output to get the file name pendulum.pdf without having to explicitly specify the name using tikzsetnextfilename{pendulum}.

Might be that this is specified in the manual, but then I haven’t understood how this is done.

Hope someone can help.

Edit:

an “MWE” (which doesn’t work as I want it to) with the TikZ-options I use per today.

documentclass[12pt]{standalone}

usepackage{tikz}
usetikzlibrary{circuits.logic.US,circuits.logic.IEC}
usetikzlibrary{external}
tikzexternalize[prefix=figures/]

begin{document}

tikzsetnextfilename{circuit}
begin{tikzpicture}[circuit logic IEC]
    matrix[column sep=7mm]
    {
        node (i0) {0}; & & 
        & node [and gate] (a1) {}; & 
        node (i1) {0}; & & node [or gate] (o) {};
        & node [nand gate] (a2) {}; & 
        node (i2) {1}; & & 
    };
    draw (i0.east) -- ++(right:3mm) |- (a1.input 1);
    draw (i1.east) -- ++(right:3mm) |- (a1.input 2);
    draw (i1.east) -- ++(right:3mm) |- (a2.input 1);
    draw (i2.east) -- ++(right:3mm) |- (a2.input 2);
    draw (a1.output) -- ++(right:3mm) |- (o.input 1);
    draw (a2.output) -- ++(right:3mm) |- (o.input 2);
    draw (o.output) -- ++(right:3mm);
end{tikzpicture}

end{document}

Edit #2

I have have something like this in my document that I want to externalize

begin{figure}[ht]
    input{pendulum.tikz}
end{figure}
begin{figure}[ht]
    input{circuit.tikz}
end{figure}
begin{figure}[ht]
    input{somethingelse.tikz}
end{figure}

I’d like the externalized graphics to have the filenames pendulum.pdf, circuit.pdf, and somethingelse.pdf, but without having to do it like this:

begin{figure}[ht]
    tikzsetnextfilename{pendulum}
    input{pendulum.tikz}
end{figure}
begin{figure}[ht]
    tikzsetnextfilename{circuit}
    input{circuit.tikz}
end{figure}
begin{figure}[ht]
    tikzsetnextfilename{somethingelse}
    input{somethingelse.tikz}
end{figure}

newcommand{includetikz}[1]{%
    tikzsetnextfilename{#1}%
    input{#1.tikz}%
}

documentclass{article}
usepackage{tikz}
usetikzlibrary{external}
tikzexternalize

% Define the command. Note that the input and output folders are static!
newcommand{includetikz}[1]{%
    tikzsetnextfilename{images_OUT/#1}%
    input{images_INP/#1.tikz}%
}

% Create a test .tikz file in the images_INP folder
begin{filecontents}{images_INP/circle.tikz}
begin{tikzpicture}
fill [orange] circle [radius=3cm];
end{tikzpicture}
end{filecontents}

begin{document}

includetikz{circle}

end{document}

newcommand{inputtikz}[2]{%
    tikzsetnextfilename{#2}%
    input{#1#2.tikz}%
}

documentclass{article}
usepackage{tikz}
usetikzlibrary{external}
tikzexternalize[prefix=./images_OUT/]

% Define the command. Note that input folder is NOT STATIC ANYMORE!
newcommand{inputtikz}[2]{%
    tikzsetnextfilename{#2}%
    input{#1#2.tikz}%
}

% Create a test .tikz file in the images_INP folder
begin{filecontents}{images_INP/circle.tikz}
  begin{tikzpicture}
     fill [orange] circle [radius=3cm];
  end{tikzpicture}
end{filecontents}

begin{document}

inputtikz{images_INP/}{circle}

end{document}