Jack Orenstein
Generating graphs from the marcel command line
I was working on a project in which I needed to munge some data, producing a stream of (x, y) tuples, and then graph the data. I had...
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Jack Orenstein
- Feb 15
- 1 min
Marcel in more places
Thanks to two different pilot errors on my part, I have broken the packaging system of two OSes that package marcel. I would have had no...
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Jack Orenstein
- Feb 9
- 3 min
Marcel and Jupyter
For years, I kept hearing about iPython, as a vastly improved Python REPL. I played with it a little bit, and yes, I saw that. I found...
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Jack Orenstein
- Jan 4
- 1 min
8 Queens as a Marcel One-Liner
Yes, the 8 Queens problem can be solved in marcel, as a one-liner even. If you want the details, you can find them here. But the basic...
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Jack Orenstein
- Dec 22, 2023
- 1 min
Workspaces! (Not "sessions")
I was ruminating about adding "sessions" to marcel, in the last blog post. It's done! They're called workspaces, not sessions. A...
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Jack Orenstein
- Oct 31, 2023
- 2 min
Thinking about sessions
A number of ideas floating around in my head are coming together around the idea of adding sessions to marcel. Here are the pieces:...
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Jack Orenstein
- Oct 26, 2023
- 1 min
Hi, Hacker News!
Wow! Somebody submitted another project of mine, Object Shell to Hacker News. Marcel supercedes Object Shell, and I guess someone on HN...
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Jack Orenstein
- Aug 4, 2023
- 2 min
Throwaway functions
Suppose you need to read a CSV file and fix the data in one of the columns. Maybe a column has strings that may contain spaces and...
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Jack Orenstein
- Oct 30, 2020
- 1 min
Building new commands
grep is very useful, and you can call it from marcel, e.g. grep "def render_compact" *.py Running this in marcel's marcel/object...
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Jack Orenstein
- Aug 13, 2020
- 2 min
Streams and Variables
Marcel pipes carry streams of data between operators. In the same way that you find it useful to store lists or arrays or sets of objects...
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Jack Orenstein
- Aug 13, 2020
- 1 min
Pipelines and Variables
Most interaction with marcel involves the execution of a pipeline. For example: ls -fr | select (f: now() - f.mtime < days(1)) ls...
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Jack Orenstein
- Jun 21, 2020
- 2 min
Database Access
Marcel pipes streams of tuples between operators. Relational databases operate on tables, which are sets of tuples, and queries yield...
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Jack Orenstein
- Jun 16, 2020
- 2 min
Marcel the Shell
Welcome to marcel! Marcel is yet another shell that pipes objects between commands, instead of strings. What is different about marcel is...
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