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Try opening a library file in a text editor (but be careful with Notepad - it sometimes plays tricks) and look through it. I think you will see plainly the section markers.

Hello guys,

I'd like to ask how ngspice, under the hood of Kicad, actually manages library files.?

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From ngspice manual, there are two ways to include .models or .subckt, namely using .include vs .lib directive.

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.include <filename> literally includes the content of <filename> where the directive is located (e.g. within a .cir netlist). It works, let's say, just like the #include pre-processing directive in C language.

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.lib instead actually includes only parts from library referenced in the file where the .lib directive is. The manual says that. lib directive has the following format: .lib <filename> libname. The latter should be the name of a "section" within the <filename> library file.

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If the above is correct, what are the "markers" of sections within the library files ?

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Thanks.

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If the above is correct, what are the "markers" of sections within the library files ?

The .LIB statement allows including library descriptions into the input file. Inside the *.lib
file a library libname will be selected. The statements of each library inside the *.lib file are
enclosed in .LIB libname <...> .ENDL statements.

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On Wed, Feb 26, 2025 at 01:35 PM, Tony Casey wrote:

.subckt <name> 1 2 3
..
..
.ends <name>

From ngspice-44 manual section 2.10:

The .LIB statement allows including library descriptions into the input file. Inside the *.lib
file a library libname will be selected. The statements of each library inside the *.lib file are
enclosed in .LIB libname <...> .ENDL statements.

From above I believe the "markers" are .LIB and .ENDL statements within the library file itself. I'll do a test using them within a my library.