A collection of tiny tricks to solve common problems

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These are tools and tricks I use regularly which are too small to give them full articles but too useful not to describe them.

jump between versions within a filesystem tree

# start ~/path/to/source/branch-7.9/src/path/to/folder
cd $(echo $PWD | sed s/7.9/master/)
# now at ~/path/to/source/branch-master/src/path/to/folder

I use this regularly at work to avoid deep navigation. Typically via C-r 7.9/master — and for the reverse C-r master/7.9.

Increase bash history size

This is essential to re-use commands without typing them.

Add the following to ~/.bashrc:

# better bash history handling
export HISTSIZE=100000
export HISTFILESIZE=1000000
export HISTCONTROL=erasedups
shopt -s histappend

Activate readline and colors in the Guile REPL

To be enjoyable to use interactively, Guile requires readline and colors.

Just put the following in ~/.guile:

(cond ((false-if-exception (resolve-interface '(ice-9 readline)))
       =>
       (lambda (module)
         ;; Enable completion and input history at the REPL.
         ((module-ref module 'activate-readline))))
      (else
       (display "Consider installing the 'guile-readline' package for
convenient interactive line editing and input history.\n\n")))

      (unless (getenv "INSIDE_EMACS")
        (cond ((false-if-exception (resolve-interface '(ice-9 colorized)))
               =>
               (lambda (module)
                 ;; Enable completion and input history at the REPL.
                 ((module-ref module 'activate-colorized))))
              (else
               (display "Consider installing the 'guile-colorized' package
for a colorful Guile experience.\n\n"))))