SPICE support in KiCad 5 has been significantly reworked to make it work better as a simulation platform. One casualty of this is that the OldWays no longer seem to work¹⁾, and I have a lot of simulations I set up under KiCad 4. In particular, when KiCad generates *cir files, it no longer prepends -PSPICE/-GNUCAP or appends +PSPICE/+GNUCAP text found on your schematic to the file. It also adds a .title directive to the file that my simulator doesn't understand and chokes on.

So I hacked together a script that makes it relatively easy to convert KiCad 4 simulation setups to something that works in KiCad 5. I'm dumping the source code here for now and will probably be moving it to Git[lab|hub] soon.

#! /bin/bash
 
# (C) 2018 Mithat Konar https://mithatkonar.com
 
# A scheme to use arbitrary SPICE simulators in Kicad 5.
#
# Usage:
# * Put all the stuff to be prepended (e.g., -PSPICE stuff) in pre.cir.
# * Put all the stuff to be appended  (e.g., +PSPICE stuff) in post.cir.
# * In this script:
#       * Set CIRCUITNAME to point to the .cir file Kicad 5 generates.
#       * Set SPICE_ENGINE to your desired SPICE engine. (You'll need to
#         hack the line where it's invoked to add command line
#         parameters or if it's weird.)
# * Set the simulator in Kicad to this file using an absolute path.
# * Run Simulator
 
### --- config ------------------------------------------------------- #
# The name of the cir file to simulate with (w/o extension).
CIRCUITNAME=opa-x5-spice
 
# The SPICE engine you want to use.
SPICE_ENGINE=spiceopus
# -------------------------------------------------------------------- #
 
### constants
CIRCUITFILE=${CIRCUITNAME}.cir
CIRCUITFILE_CLEANED=${CIRCUITNAME}-cleaned.cir
GENERATED_CIR=${CIRCUITNAME}-complete.cir
 
### Go!
# set the script's directory as the working directory
cd $( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 
# remove all lines starting with .title from CIRCUITFILE
sed '/^.title/d' $CIRCUITFILE > $CIRCUITFILE_CLEANED
 
# concatenate the final file
cat pre.cir > $GENERATED_CIR
cat $CIRCUITFILE_CLEANED >> $GENERATED_CIR
cat post.cir >> $GENERATED_CIR
 
# run it
$SPICE_ENGINE $GENERATED_CIR
 
# cleanup
#~ rm $GENERATED_CIR
rm $CIRCUITFILE_CLEANED