Bash history for each project


Previously, I tried to use zsh when I am working, so that my default bash history will not be filled with project related commands, especially git commands. Because some of my bash history are useful like ffmpeg related commands. So, I tried to distinct project work and non-project work with zsh and bash, so that they have different shell histories.

However, there are two problems when I use zsh,

  1. All my projects use the same zsh history. The old history may be lost if I have too many commands (depends on HISTSIZE variable).
  2. zsh is slow with git auto-completion.

However, zsh has one thing better than bash, that is, auto-completion navigation. Let’s say your directory has various sub-directories, double tab will bring to directory navigation that can be controlled with arrow keys. This is useful for me to navigate to non-alphabetic directories, like the directory with CJK characters.

Due to the slowness of git auto-completion as mentioned above, I decided to find an alternative solution, so that I can use bash instead of zsh, and separate the shell history from non-project work. At the end, I come out with this,

#!/bin/bash

# source any shell script, like rvm or nvm

touch "$PWD/.bash_history"
history -a
export HISTFILE="$PWD/.bash_history"
history -r
export PS1='\[\033[1m\]\u@\h \[\033[0m\]\w$(__git_ps1 " (%s)")\$ ' # custom prompt to differentiate from default prompt

So, add the above content to a file like init.sh in the project directory. Whenever starting with the project, run

source ./init.sh

Hence, the .bash_history will be saved and used in the project directory.

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