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asciidemo-tools

a framework to simplify generation of asciinema-based demos

Background

Our team had some tribal knowledge around the use of asciinema and asciicast2gif to generate demo clips used to supplement repository README.md.
This represents an effort to commoditize that pipeline to make it easier to use/share.
asciicast2gif was retired and replaced with agg, which seems to be generally available and installable without much in the way of dependencies.

Current Design Assumptions

  • asciinema is locally installed or otherwise can be invoked using the asciinema command and standard option passing (note that running this as a container has implications on what commands can be executed, for e.g. starting kind clusters).
  • agg is locally installed or otherwise can be invoked using the agg command and standard option passing

Usage

The functional entrypoint is generate-gif.sh. This script takes two (mandatory) positional parameters corresponding to the input script name and the output GIF filename.

input script requirements

Any input script can either function as a standlone script to be executed & captured, or can leverage a common library of convenience routines in demo-functions.sh. To use the library routines, the input script should source the demo-functions.sh file.

Example:

The following script

  1. identifies its home path and sources the function library it knows resides in the directory above it
  2. performs some global actions to pre-configure the execution environment
  3. executes a user-defined run function which exercises the library's typeline function to type (and optionally execute) the specified command
#!/usr/bin/env bash

SCRIPTPATH="$( cd -- "$(dirname "$0")" > /dev/null 2>&1 ; pwd -P )"

#echo "SCRIPTPATH is $SCRIPTPATH"
. ../$SCRIPTPATH/demo-functions.sh

#echo "INTERACTIVE is $INTERACTIVE"

INFILE=$HOME/devel/example-operator-index/semver-veneer.yaml

sed -i -e 's/^generatemajorchannels: .$/generatemajorchannels: true/' $INFILE
sed -i -e 's/^generateminorchannels: .$/generateminorchannels: false/' $INFILE

function run() {
	# pretty-print the input schema
	typeline -x "# <--> Pretty-print the input schema "
	typeline "yq $INFILE"
	typeline "clear"
	#clear
	typeline -x "# <--> Generate the rendered FBC with auto-generated channels"
	typeline "./bin/opm alpha render-veneer semver $INFILE -o yaml"
	#typeline './bin/opm alpha render-veneer semver' $INFILE '-o yaml | yq "select(.schema == \"olm.channel\")"'
	sleep 5
        typeline "clear"
	#clear
	typeline -x "# <--> Generate the mermaid graph data for auto-generated channels"
	typeline "./bin/opm alpha render-veneer semver $INFILE -o mermaid"
	sleep 10
	typeline -x "# <--> Done!"
}

run

execution of this script via a local git clone of this project might look like:

 % ~/devel/asciidemo-tools/generate-gif.sh ~/devel/asciidemo-tools/example/demo-script-major.sh ~/devel/asciidemo-tools/major-test.gif

(NB: the example script in this case has some dependencies on the path to the opm binary, so has to be invoked from the where that path exists -- in this case, a clone of operator-registry)