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POCode challenge: Bash prompt path shortener
 

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  1. POCode challenge: Bash prompt path shortener
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    <p>I implemented a prompt path shortener for bash to be included in the PS1 environment variable, which shortens the working directory into something more compact but still descriptive. I'm curious what other ideas may exist.</p> <p>Here's the challenge:</p> <p>Create a bash function <code>_dir_chomp</code> which can be included into PS1 like this (line breaks inserted for readability):</p> <pre><code>PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] $( _dir_chomp "$(pwd)" 20 )\[\033[01;37m\]$(parse_git_branch)\[\033[01;34m\] \$\[\033[00m\] ' </code></pre> <p>with "20" being the parameter for the maximum length as soft limit. These are the examples:</p> <ol> <li><code>/usr/portage/media-plugins/banshee-community-extensions/files</code> becomes <code>/u/p/m/b/files</code></li> <li><code>/home/user1/media/video/music/live-sets</code> becomes <code>~/m/v/m/live-sets</code> (note the ~ character as replacement for $HOME)</li> <li><code>/home/user2/media</code> does NOT change (20 char limit not exceeded)</li> <li><code>/home/user1/this-is-a-very-long-path-name-with-more-than-20-chars</code> becomes <code>~/this-is-a-very-long-path-name-with-more-than-20-chars</code> (last component stays unshortened: soft limit)</li> <li><code>/home/user1/src</code> becomes <code>~/src</code> ($HOME always shortened)</li> <li><code>/home/user1/.kde4/share/config/kresources</code> becomes <code>~/.k/s/c/kresources</code> (note the prefixing dot is preserved)</li> </ol> <p>Current user is user1.</p> <p>It's allowed to call external interpreters like <code>awk</code>, <code>perl</code>, <code>ruby</code>, <code>python</code> but not compiled C programs or similar. In other words: external source files are not allowed, code must be inline. Shortest version wins. The length of the bash function body (and called sub functions) counts, means:</p> <pre><code>_sub_helper() { # this counts } _dir_chomp() { # these characters count (between { and }) _sub_helper "foobar" # _sub_helper body counts, too } </code></pre>
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    1. COI notice you have `parse_git_branch` - is that something you prefer to `__git_ps1`?
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    2. COAnd really, as long as someone takes the time to go for it, I doubt anything could beat an unreadable-but-short perl solution.
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    3. CO@Jefromi: That's just a one liner: `git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ [git:\1]/'`. BTW: My solution to this is ruby, not perl. And pretty readable although a one-liner, too.
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