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https://github.com/pavoljuhas/smart-change-directory

smart change of directory in a Unix shell, IPython and Vim
https://github.com/pavoljuhas/smart-change-directory

ipython shell zsh

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smart change of directory in a Unix shell, IPython and Vim

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README 

        
# smart-change-directory (scd)



[Z shell](http://www.zsh.org) function for visiting any directory in

a unix shell, [Vim](http://www.vim.org) or [IPython](http://ipython.org).



`scd` is a Z shell (Zsh) script for changing to any directory with a few

keystrokes.  scd keeps history of the visited directories, which

serves as an index of the known paths.  The directory index is updated after

every `cd` command in the shell and can be also filled manually by running

`scd -a`.  To switch to some directory, scd needs few fragments of the

desired path to match with the index.  A selection menu is displayed in case

of several matches, with a preference given to recently visited paths.

scd can define persistent aliases, which match only their target paths.



## SYNOPSIS



```sh

scd [options] [pattern1 pattern2 ...]

```



## PATTERNS



Patterns may use all zsh [glob operators](

http://zsh.sourceforge.net/Doc/Release/Expansion.html#Glob-Operators)

available with *extendedglob* option.  Specified patterns must match

the absolute path and at least one of them must match in the tail.

Several special patterns are also recognized as follows:







^PAT




  PAT must match at the beginning of the path, for example, "^/home"




PAT$




  require PAT to match the end of the path, "man$"




./




  match only subdirectories of the current directory




PAT:




  require PAT to match over the tail component, "doc:", "re/doc:"





## OPTIONS







-a, --add




  add current or specified directories to the directory index.

  For file arguments add their containing paths.





--unindex




  remove current or specified directories from the index.





-r, --recursive




  apply options --add or --unindex recursively.





--alias=ALIAS




  create alias for the current or specified directory and save it to

  ~/.scdalias.zsh.





--unalias




  remove ALIAS definition for the current or specified directory from

  ~/.scdalias.zsh.  Use "OLD" to purge aliases to non-existent

  directories.





-A, --all




  display all directories even those excluded by patterns in

  ~/.scdignore.  Disregard the unique matching for a

  directory alias and filtering of less likely paths.





-p, --push




  use "pushd" to change to the target directory.





--list




  show matching directories and exit.





-v, --verbose




  display directory rank in the selection menu.





-h, --help




  display this options summary and exit.





## INSTALLATION



## Unix shell



1.  Make sure that Z shell is installed.  On Linux it is usually the `zsh`

    package.



2.  Copy or symlink the [bin/scd](bin/scd) script to some directory

    in the PATH.



3.  Find out what shell is active for your account by running `ps -p $$`.



4.  Edit the startup file for your shell and have it source the

    corresponding scd setup file from [shellrcfiles](shellrcfiles)

    as follows:



    * *zsh*



      ```zsh

      # ~/.zshrc

      source ~/Software/smart-change-directory/shellrcfiles/zshrc_scd

      ```



      Note that scd aliases are named directories in Zsh and can

      be thus expanded as `~NAME` in the shell.  If you use the

      [oh-my-zsh](https://github.com/robbyrussell/oh-my-zsh)

      framework you may just activate the `scd` plugin instead.



    * *bash*



      ```bash

      # ~/.bashrc

      source ~/Software/smart-change-directory/shellrcfiles/bashrc_scd

      ```



    * *tcsh*



      ```sh

      # ~/.cshrc

      source ~/Software/smart-change-directory/shellrcfiles/tcshrc_scd

      ```



    * *dash*



      ```sh

      # add to ~/.profile or to the ${ENV} file

      . ~/Software/smart-change-directory/shellrcfiles/dashrc_scd

      ```



## Examples



```sh

# Index recursively some paths for the very first run

scd -ar ~/Documents/



# Change to a directory path matching "doc"

scd doc



# Change to a path matching all of "a", "b" and "c"

scd a b c



# Change to a directory path that ends with "ts"

scd "ts$"



# Show selection menu and ranking of 20 most likely directories

scd -v



# Alias current directory as "xray"

scd --alias=xray



# Jump to a previously defined aliased directory

scd xray

```



## Installation as Vim plugin



Please refer to https://github.com/pavoljuhas/scd.vim.



## Installation as IPython extension



1. Copy or symlink [ipython/ipy_scd.py](ipython/ipy_scd.py)

   to some directory in Python module path.



2. In IPython terminal session do `%load_ext ipy_scd`

   to define the `%scd` magic command.  This also modifies the `%cd`,

   `%pushd`, `%popd` magics to add directories to the scd index.  To load

   `ipy_scd` for every IPython session, modify

   `.../profile_default/ipython_config.py` so that it contains

   ```Python

   c.TerminalIPythonApp.extensions = ['ipy_scd']

   ```



3. If `scd` is not in the PATH, its location can be defined with

   ```Python

   import ipy_scd

   ipy_scd.scd_executable = '/path/to/scd'

   ```



## Examples



```Python

# recursively index ~/.local/ and its subdirectories

%scd -ar ~/.local



# jump to the site-packages directory (if exists in ~/.local)

%scd site pack

```



## FILES







~/.scdhistory




    time-stamped index of visited directories.





~/.scdalias.zsh




    scd-generated definitions of directory aliases.





~/.scdignore




    

    glob patterns for paths to be ignored in the scd search, for example,

    /mnt/backup/*.  The patterns are specified one per line

    and are matched assuming the extendedglob zsh option.  Lines

    starting with "#" are skipped as comments.  The .scdignore patterns

    are not applied in the --all mode.





## ENVIRONMENT







SCD_HISTFILE




    path to the scd index file (by default ~/.scdhistory).





SCD_HISTSIZE




    maximum number of entries in the index (5000).  Index is trimmed when it

    exceeds SCD_HISTSIZE by more than 20%.





SCD_MENUSIZE




    maximum number of items for directory selection menu (20).





SCD_MEANLIFE




    mean lifetime in seconds for exponential decay of directory

    likelihood (86400).





SCD_THRESHOLD




    threshold for cumulative directory likelihood.  Directories with

    a lower likelihood compared to the best match are excluded (0.005).

    





SCD_SCRIPT




    command script file where scd writes the final cd

    command.  This variable must be defined when scd runs in its own

    process rather than as a shell function.  It is up to the

    scd caller to use the output in SCD_SCRIPT.