library-of-babel.org 3.0 KB
The Library of Babel
Introduction
The Library of Babel is an extensible collection of ready-made and
easily-shortcut-callable source-code blocks for handling common
tasks. Org-babel comes pre-populated with the source-code blocks
located in this file. It is possible to add source-code blocks from
any org-mode file to the library by calling (org-babel-lob-ingest
"path/to/file.org").
This file is included in worg mainly less for viewing through the web interface, and more for contribution through the worg git repository. If you have code snippets that you think others may find useful please add them to this file and contribute them to worg.
The raw Org-mode text of this file can be downloaded at library-of-babel.org
Simple
A collection of simple utility functions
input
File I/O
reading and writing files
Read the contents of the file at path into a string.
(with-temp-filebuffer path
(buffer-substring (point-min) (point-max)))
Read the lines of the file at path into a list.
(split-string
(with-temp-filebuffer path
(buffer-substring (point-min) (point-max))))
Write data to a file at path. If data is a list, then write it
as a table in traditional Org-mode table syntax.
(with-temp-file path
(org-babel-insert-result data))
nil
remote files
Read local or remote file in json format into emacs-lisp objects.
(require 'json)
(cond
(file
(with-temp-filebuffer file
(goto-char (point-min))
(json-read)))
(url
(require 'w3m)
(with-temp-buffer
(w3m-retrieve url)
(goto-char (point-min))
(json-read))))
Plotting code
R
Plot column 2 (y axis) against column 1 (x axis). Columns 3 and beyond, if present, are ignored.
plot(data)
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 16 |
| 5 | 25 |
nil
Gnuplot
Table/Matrix manipulation
Elegant lisp code for transposing a matrix.
| 1 | 2 | 3 |
| 4 | 5 | 6 |
(apply #'mapcar* #'list table)
| 1 | 4 |
| 2 | 5 |
| 3 | 6 |
Misc
a
a + b