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GNU Emacs as a Comic Book Reader

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  Comics are available in digital format as a collection of images in a compressed ZIP or RAR file (.cbz or .cbr file extension respectively). These can be enjoyed in GNU Emacs with full access to image viewing capabilities using keybindings.   # Make sure you have unrar installed for CBR files # apt install unrar   (require 'arc2-mode)   (setq archive-summarize-files-fn 'archive-summarize-files-as-thumb)     Note: The archive-mode is capable of displaying the list of files in an archive; though it depends on external tools for extraction. For JPG and PNG, Emacs can resize the image without external convertor (ie. imagemagick). However, some menu options for image transformations in image-mode might not be available. Use the following patch for image-mode.el . @@ -460,16 +460,16 @@ image-mode-map       :help "Show image as hex"]      "--"      ["Fit to Window Height" image-transform-fit-to-height -     :visible (eq image-type 'imagemagick) +
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Data Visualization with GNU Emacs

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    GNU Emacs can be used for quick data visualization in combination with Gnuplot. When you have some data and you want to visualize what the correlation looks like, this command comes in handy. No need for any setup - no data file and no Gnuplot script. The command below uses some sensible defaults for trivial cases. If the first line contains string label, the same is used as a key label for the value and/or axes' names as appropriate. If there's a single column of data, it is used as Y value. If there's more than one column, first column is used as X value and other columns are plotted along Y-axis. Takes care of comma or whitespace separator. Note: The latest version of the code is available at the end of the post. Options available in latest version   - Install gnuplot executable and gnuplot Elisp package . - Evaluate the defun ( C-M-x ). - Select a data range using rectangle command copy-rectangle-as-kill (C-x r M-w). - Run M-x  gnuplot-rectangle. This opens the g
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Tinylisp and Multi-threaded Emacs

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TAME-ing the beast!! Here's a fork of tinylisp and a glimpse of a possible multi-threaded future. Below is the content of the file a.el in the demo. It creates one read thread which waits for non-nil value of global-var and a set thread which sleeps for 5s before modifying global-var and notifying the waiting threads. Since these are running in separate threads, main loop is free for user input. (define list (lambda args args)) (define defun (macro (f v . x) (list 'define f (list 'lambda v (cons 'progn x))))) (setq make-condition-variable make-cond) (setq condition-wait cond-wait) (setq condition-notify cond-signal) (setq message p) (setq sleep-for sleep) (setq global-var nil) ;; Create a mutex and an associated condition variable (setq mutex (make-mutex "mutex")) (setq cond-var (make-condition-variable mutex "cond-var")) ;; Read and set functions used by read and set threads (defun set-global-var ()   (mutex-lock mutex)   (sleep 5)   (setq global-
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