[Nish](https://github.com/thindil/nish) is a non-POSIX, multiplatform (tested on Linux and FreeBSD but should work on Windows too. With a lot of unixisms inside) command-line shell (similar to zsh, bash or fish), currently in the beta stage. It offers some features common for commands' shells, like Tab completion, syntax highlighting, variables or aliases. But it doesn't provide, for example, the own scripting language. Generally, think about it as a mix of Atuin and DirEnv projects, just written in Nim. :)
A long description: ##### Main features * Use a database to store all data related to the shell > All the shell's data, configuration, history, variables and aliases are > stored in SQLite database. It allows adding some interesting features to the > shell, like searching through its history. * Global and local aliases > The shell allows declaring not only standard aliases, which are available > everywhere, but also aliases which available only in the selected > directories. For example, you can declare alias `build` which in one > directory will be executing `make -j5` and in another `nim release`. Aliases > can be declared for just one directory or for each subdirectory of the > selected directory too. * Advanced shell's commands' history > There are available a few commands to manipulate the shell's commands' > history, like show history or clear it. It is also possible to set the amount > of commands to store in the shell's history, or the shell should store also > invalid commands or not. When there is some text entered by the user, the > history search only commands which starts with the entered text. The shell > sorts the commands' history not only by most recently used, but also by most > frequently used. Additionally, the command allows selecting the amount of > commands to show, their sorting order and criteria. These settings cam be set > as permanent in the shell's options or ad hoc for the one time. It is also > possible to search for a command in the history with the separated shell > command. * Advanced shell's configuration > All shell's options can be previewed from the shell. Additionally, it is > possible to set them inside the shell and reset options' values to the > default values. Also, there are options which are read-only, like, for > example, the current version of the shell's database schema. * Global and local environment variables > Beside standard support for environment variables, with set and unset > commands, the shell offers also ability to set environment variables only for > the selected directories, in the same way how aliases set. * Plugins > The shell's offers a very simple API which allows writing its plugins in any > programming language. The communication between the shell and the plugin are > made by standard input and output, where the API calls are sending as command > line arguments. The plugins can reside in any location. * Advanced help system > The whole content of the help is added to the local database of the shell. It allows searching for help topics, but also to locally modify the help entries. The use can in any moment bring back the default content, or update the local with the new version, with the one command. * Tab completion for the user's entered commands with names of files and directories relative to the current directory and with available commands. It also allows selecting a completion from the list if there is more than one completion available. It is also possible to set the amount of the completions displayed on the list. * Coloring the user entered command on green when it is valid or red when it is invalid, separated colors for environment variables and commands' arguments which contains quotes or double quotes. Can be enabled or disabled in the shell's options. * Suggestions for commands when the user entered an unknown command. It is possible to set the precision of the suggestions with the shell's option. The feature can be disabled either. * Setting the terminal title, can be enabled or disabled in the shell's options. * Theming system. It is possible to set the colors and style, like use underline, bold or italic font (if the terminal emulator supports it) for various of the shell's outputs (errors, help entries, etc.). * Ability to execute command with or without the system's default shell. Additionally, the default behavior of the shell can be set in the shell's options.
