Category Archives: Software

Notes on Programming Hyperledger Fabric

Posted on December 17, 2020 by Siddharth Jain

I just finished writing a book:https://www.amazon.com/dp/0578802228 In this post I am making some notes and fun facts about the book for remembrance. Original TOC Final TOC Blockchain Primer Introducing Hyperledger Fabric A proof of concept app Setting up your infrastructure … Continue reading →

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VS Code + AsciiDoc

Posted on December 3, 2020 by Siddharth Jain

Today I learned that VS Code has a pretty good extension for AsciiDoc: https://marketplace.visualstudio.com/items?itemName=asciidoctor.asciidoctor-vscode It can even export to PDF using wkhtmltopdf. There is also the option to have it use the Ruby based asciidoctor-pdf to do the conversion. How … Continue reading →

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Using AsciidocFX

Posted on December 2, 2020 by Siddharth Jain

AsciidocFX is one dangerous program. I had it open like this. It had my root folder open in left pane and I was used to Atom where one can remove the folder by right clicking the folder and then remove … Continue reading →

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Useful Docker commands

Posted on December 2, 2020 by Siddharth Jain

Sort images by size List dangling volumes Cleaning up Docker resources: https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes#a-docker-cheat-sheet

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Cross-referencing content of another chapter in AsciiDoctorPDF

Posted on November 27, 2020 by Siddharth Jain

It is possible to cross-reference chapters in Asciidoc. The way I do it is as follows. First of all I have a top level index.adoc which is the root file that does nothing but include the various chapters one after … Continue reading →

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Getting Math to work in AsciiDoctorPDF

Posted on November 26, 2020 by Siddharth Jain

I had quite a lot of challenges getting math to render in AsciiDoctorPDF. The documentation relating to this is also confusing. It turns out that for converting asciidoc to PDF which is what I am interested in (i.e., output format … Continue reading →

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How to get rid off annoying border around SVG images in AsciiDoctorPDF

Posted on November 26, 2020 by Siddharth Jain

AsciiDoctorPDF inserts an annoying black border around SVG images generated by graphviz. E.g., given this SVG image which was generated by graphviz, if you open it in chrome you can see it has no black border as shown below: but … Continue reading →

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Validating PDFs

Posted on November 10, 2020 by Siddharth Jain

Sometimes you need to validate a PDF file. Here are step by step instructions on how to do so. Prerequisites: You need to have Java installed on your machine. Download preflight-app-2.0.21.jar from https://pdfbox.apache.org/download.cgi Run it passing the path to your … Continue reading →

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Extracting images from a PDF

Posted on November 10, 2020 by Siddharth Jain

Sometimes you need to extract images inside a PDF. Here are step by step instructions on how to do that. Prerequisites: You need to have Java installed on your machine. Download pdfbox-app-1.8.16.jar from https://pdfbox.apache.org/download.cgi. WARNING: version 2.0.21 will not work. … Continue reading →

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Using GPG

Posted on October 13, 2020 by Siddharth Jain

As an example let’s say we want to verify integrity of following file from https://hashcat.net/hashcat/ First download the file and its PGP signature (ends with .asc) 2. Next download and import the key from PGP keyserver with following command: 3. … Continue reading →

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