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Bash Line Editor (ble.sh) is a command line editor written in pure Bash scripts which replaces the default GNU Readline.
Current devel version is 0.4.
This script supports Bash 3.0 or higher although we recommend to use ble.sh with Bash 4.0 or higher.
Currently, only UTF-8 encoding is supported for non-ASCII characters.
This script is provided under the BSD License (3-clause BSD license).
Installation requires the commands git, make (GNU make), and gawk.
For detailed descriptions, see Sec 1.1 and Sec 1.2 for trial/installation,
Sec 1.3 for the setup of your ~/.bashrc.
# Quick INSTALL to BASHRC (If this doesn't work, please follow Sec 1.3)
git clone --recursive https://github.com/akinomyoga/ble.sh.git
make -C ble.sh install PREFIX=~/.local
echo 'source ~/.local/share/blesh/ble.sh' >> ~/.bashrc
# Quick TRIAL without installation
git clone --recursive https://github.com/akinomyoga/ble.sh.git
make -C ble.sh
source ble.sh/out/ble.sh
# UPDATE (in a ble.sh session)
ble-update
# PACKAGE (for package maintainers)
git clone --recursive https://github.com/akinomyoga/ble.sh.git
make -C ble.sh install DESTDIR=/tmp/blesh-package PREFIX=/usr/local- Syntax highlighting: Highlight command lines input by users as in
fishandzsh-syntax-highlighting. Unlike the simple highlighting inzsh-syntax-highlighting,ble.shperforms syntactic analysis to enable the correct highlighting of complex structures such as nested command substitutions, multiple here documents, etc. - Enhanced completion:
Support syntax-aware completion, completion with quotes and parameter expansions in prefix texts, ambiguous candidate generation, etc.
Also menu-complete supports selection of candidates in menu (candidate list) by cursor keys, TAB and S-TAB.
The feature auto-complete supports the automatic suggestion of completed texts as in
fishandzsh-autosuggestions(with Bash 4.0+). The feature menu-filter integrates automatic filtering of candidates into menu completion (with Bash 4.0+). There are other functionalities such as dabbrev and sabbrev likezsh-abbreviations. - Vim editing mode: Enhance
readline's vi editing mode available withset -o vi. Vim editing mode supports various vim modes such as char/line/block visual/select mode, replace mode, command mode, operator pending mode as well as insert mode and normal mode. Vim editing mode supports various operators, text objects, registers, keyboard macros, marks, etc. It also providesvim-surroundas an option.
Note: ble.sh does not provide a specific settings for the prompt, aliases, functions, etc.
ble.sh provides a more fundamental infrastructure so that users can set up their own settings for prompts, aliases, etc.
Of course ble.sh can be used in combination with other Bash configurations such as bash-it and oh-my-bash.
Demo (version 0.2)
1.1 Try ble.sh generated from source (version ble-0.4 devel)†
To generate ble.sh, gawk (GNU awk) and gmake (GNU make) is required.
The file ble.sh can be generated using the following commands.
If you have GNU make installed on gmake, please use gmake instead of make.
git clone --recursive https://github.com/akinomyoga/ble.sh.git
cd ble.sh
makeA script file ble.sh will be generated in the directory ble.sh/out.
Then, you can load ble.sh in the Bash session using the source command:
source out/ble.shTo install ble.sh in a specified directory, use make install.
# INSTALL to ~/.local/share/blesh
make install
# INSTALL to a specified directory
make install INSDIR=/path/to/blesh
# PACKAGE (for package maintainers)
make install DESTDIR=/tmp/blesh-package PREFIX=/usr/localIf either the make variables DESTDIR or PREFIX is supplied, ble.sh will be copied to $DESTDIR/$PREFIX/share/blesh.
Otherwise, if the make variables INSDIR is specified, it will be installed directly on $INSDIR.
Otherwise, if the environment variable $XDG_DATA_HOME is defined, the install location will be $XDG_DATA_HOME/blesh.
If none of these variables are specified, the default install location is ~/.local/share/blesh.
To set up .bashrc see Sec. 1.3.
1.2 Or, try ble.sh downloaded from GitHub releases (version ble-0.3 201902)†
With wget:
wget https://github.com/akinomyoga/ble.sh/releases/download/v0.3.3/ble-0.3.3.tar.xz
tar xJf ble-0.3.3.tar.xz
source ble-0.3.3/ble.shWith curl:
curl -LO https://github.com/akinomyoga/ble.sh/releases/download/v0.3.3/ble-0.3.3.tar.xz
tar xJf ble-0.3.3.tar.xz
source ble-0.3.3/ble.shIf you want to place ble.sh in a specific directory, just copy the directory:
cp -r ble-0.3.3 /path/to/blesh1.3 Set up .bashrc†
If you want to load ble.sh by default in interactive sessions of bash, usually one can just source ble.sh in ~/.bashrc,
but more reliable way is to add the following codes to your .bashrc file:
# bashrc
# Add this lines at the top of .bashrc:
[[ $- == *i* ]] && source /path/to/blesh/ble.sh --noattach
# your bashrc settings come here...
# Add this line at the end of .bashrc:
[[ ${BLE_VERSION-} ]] && ble-attachUser settings can be placed in the init script ~/.blerc (or ${XDG_CONFIG_HOME:-$HOME/.config}/blesh/init.sh if ~/.blerc is not available)
whose template is available as the file blerc in the repository.
The init script is a Bash script which will be sourced during the load of ble.sh, so any shell commands can be used in ~/.blerc.
If you want to change the default path of the init script, you can add the option --rcfile INITFILE to source ble.sh as the following example:
# in bashrc
# Example 1: ~/.blerc will be used by default
[[ $- == *i* ]] && source /path/to/blesh/ble.sh --noattach
# Example 2: /path/to/your/blerc will be used
[[ $- == *i* ]] && source /path/to/blesh/ble.sh --noattach --rcfile /path/to/your/blercYou need Git (git), GNU awk (gawk) and GNU make (make).
For ble-0.3+, run ble-update in the session with ble.sh loaded:
$ ble-updateYou can instead download the latest version by git pull and install it:
cd ble.sh # <-- enter the git repository you already have
git pull
git submodule update --recursive --remote
make
make INSDIR="$HOME/.local/share/blesh" installBasically you can simply delete the installed directory and the settings that user added.
- Remove the added lines in
.bashrc. - Remove
blercfiles (~/.blercor~/.config/blesh/init.sh) if any. - Remove the installed directory.
- Remove the temporary directory
/tmp/bleshif any [ Only needed when your system does not automatically clears/tmp].
Here some of the settings for ~/.blerc are picked up.
You can find useful settings also in Q&A,
Recipes
and contrib repository.
The complete list of setting items can be found in the template blerc.
For detailed explanations please refer to Manual.
For the vi/vim mode, check the Wiki page.
The feature auto-complete is available for Bash 4.0+ and enabled by default.
If you want to turn off auto-complete, please put the following line in your ~/.blerc.
bleopt complete_auto_complete=Instead of completely turning off auto-complete, you can set a delay for auto-complete.
# Set the delay of the auto-complete to 300 milliseconds
bleopt complete_auto_delay=300auto-complete candidates based on the bash command history can be turned off by the following line.
bleopt complete_auto_history=The option char_width_mode controls the width of the Unicode characters with East_Asian_Width=A (Ambiguous characters).
Currently four values emacs, west, east, and auto are supported. With the value emacs, the default width in emacs is used.
With west all the ambiguous characters have width 1 (Hankaku). With east all the ambiguous characters have width 2 (Zenkaku).
With auto the width mode west or east is automatically chosen based on the terminal behavior.
The default value is auto. Appropriate value should be chosen in accordance with your terminal behavior.
For example, the value can be changed to west as:
bleopt char_width_mode='west'The option input_encoding controls the encoding scheme used in the decode of input. Currently UTF-8 and C are available. With the value C, byte values are directly interpreted as character codes. The default value is UTF-8. For example, the value can be changed to C as:
bleopt input_encoding='C'The options edit_abell and edit_vbell control the behavior of the edit function bell. If edit_abell is a non-empty string, audible bell is enabled, i.e. ASCII Control Character BEL (0x07) will be written to stderr. If edit_vbell is a non-empty string, visual bell is enabled. By default, the audible bell is enabled while the visual bell is disabled.
The option vbell_default_message specifies the message shown as the visual bell. The default value is ' Wuff, -- Wuff!! '. The option vbell_duration specifies the display duration of the visual-bell message. The unit is millisecond. The default value is 2000.
For example, the visual bell can be enabled as:
bleopt edit_vbell=1 vbell_default_message=' BEL ' vbell_duration=3000
For another instance, the audible bell is disabled as:
bleopt edit_abell=
The colors and attributes used in the syntax highlighting are controlled by ble-color-setface function. The following code reproduces the default configuration:
# highlighting related to editing
ble-color-setface region bg=60,fg=white
ble-color-setface region_target bg=153,fg=black
ble-color-setface region_match bg=55,fg=white
ble-color-setface region_insert fg=12,bg=252
ble-color-setface disabled fg=242
ble-color-setface overwrite_mode fg=black,bg=51
ble-color-setface auto_complete fg=238,bg=254
ble-color-setface menu_filter_fixed bold
ble-color-setface menu_filter_input fg=16,bg=229
ble-color-setface vbell reverse
ble-color-setface vbell_erase bg=252
ble-color-setface vbell_flash fg=green,reverse
ble-color-setface prompt_status_line fg=231,bg=240
# syntax highlighting
ble-color-setface syntax_default none
ble-color-setface syntax_command fg=brown
ble-color-setface syntax_quoted fg=green
ble-color-setface syntax_quotation fg=green,bold
ble-color-setface syntax_expr fg=26
ble-color-setface syntax_error bg=203,fg=231
ble-color-setface syntax_varname fg=202
ble-color-setface syntax_delimiter bold
ble-color-setface syntax_param_expansion fg=purple
ble-color-setface syntax_history_expansion bg=94,fg=231
ble-color-setface syntax_function_name fg=92,bold
ble-color-setface syntax_comment fg=242
ble-color-setface syntax_glob fg=198,bold
ble-color-setface syntax_brace fg=37,bold
ble-color-setface syntax_tilde fg=navy,bold
ble-color-setface syntax_document fg=94
ble-color-setface syntax_document_begin fg=94,bold
ble-color-setface command_builtin_dot fg=red,bold
ble-color-setface command_builtin fg=red
ble-color-setface command_alias fg=teal
ble-color-setface command_function fg=92
ble-color-setface command_file fg=green
ble-color-setface command_keyword fg=blue
ble-color-setface command_jobs fg=red
ble-color-setface command_directory fg=26,underline
ble-color-setface filename_directory underline,fg=26
ble-color-setface filename_directory_sticky underline,fg=white,bg=26
ble-color-setface filename_link underline,fg=teal
ble-color-setface filename_orphan underline,fg=teal,bg=224
ble-color-setface filename_executable underline,fg=green
ble-color-setface filename_setuid underline,fg=black,bg=220
ble-color-setface filename_setgid underline,fg=black,bg=191
ble-color-setface filename_other underline
ble-color-setface filename_socket underline,fg=cyan,bg=black
ble-color-setface filename_pipe underline,fg=lime,bg=black
ble-color-setface filename_character underline,fg=white,bg=black
ble-color-setface filename_block underline,fg=yellow,bg=black
ble-color-setface filename_warning underline,fg=red
ble-color-setface filename_url underline,fg=blue
ble-color-setface filename_ls_colors underline
ble-color-setface varname_array fg=orange,bold
ble-color-setface varname_empty fg=31
ble-color-setface varname_export fg=200,bold
ble-color-setface varname_expr fg=92,bold
ble-color-setface varname_hash fg=70,bold
ble-color-setface varname_number fg=64
ble-color-setface varname_readonly fg=200
ble-color-setface varname_transform fg=29,bold
ble-color-setface varname_unset fg=124The current list of faces can be obtained by the following command (ble-color-setface without arguments):
$ ble-color-setfaceThe color codes can be checked in output of the function ble-color-show (defined in ble.sh):
$ ble-color-showKey bindings can be controlled with the shell function, ble-bind.
For example, with the following setting, "Hello, world!" will be inserted on typing C-x h
ble-bind -f 'C-x h' 'insert-string "Hello, world!"'For another example, if you want to invoke a command on typing M-c, you can write as follows:
ble-bind -c 'M-c' 'my-command'Or, if you want to invoke a edit function (designed for Bash bind -x) on typing C-r, you can write as follows:
ble-bind -x 'C-r' 'my-edit-function'The existing key bindings are shown by the following command:
$ ble-bind -PThe list of widgets is shown by the following command:
$ ble-bind -LWhen the command line string contains a newline character, ble.sh enters the MULTILINE mode.
By typing C-v RET or C-q RET, you can insert a newline character in the command line string. In the MULTILINE mode, RET (C-m) causes insertion of a new newline character. In the MULTILINE mode, the command can be executed by typing C-j.
When the shell option shopt -s cmdhist is set (which is the default),
RET (C-m) inserts a newline if the current command line string is syntactically incomplete.
If set -o vi is specified in .bashrc or set editing-mode vi is specified in .inputrc, the vim mode is enabled.
For details, please check the Wiki page.
The feature auto-complete is available in Bash 4.0 or later. auto-complete automatically suggests a possible completion on user input.
The suggested contents can be inserted by typing S-RET
(when the cursor is at the end of the command line, you can also use right, C-f or end to insert the suggestion).
If you want to insert only first word of the suggested contents, you can use M-right or M-f.
If you want to accept the suggestion and immediately run the command, you can use C-RET (if your terminal supports this special key combination).
By registering words to sabbrev, the words can be expanded to predefined strings.
When the cursor is just after a registered word, typing SP causes sabbrev expansion.
For example, with the following settings, when you type SP after the command line command L, the command line will be expanded to command | less.
# blerc
ble-sabbrev L='| less'I received many feedbacks from many people in GitHub Issues/PRs. I thank all such people for supporting the project. Among them, the following people have made particularly significant contributions.
@cmplstofBhelped me implementing vim-mode by testing it and giving me a lot of suggestions.@dylankbreported many issues for fzf-integration, initialization, etc.@rux616reported several issues and created a PR for fixing the default path of.blerc@timjrdsuggested and contributed to performance improvements in completion.@3ximusreported many issues for a wide variety of problems.