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# bashutils
Provides some nice utility methods for bash scripts.
## Features
- SOSLS v2-compliant logging
- various check methods
- easy variable definition
## Documentation
See [bashutils.staropensource.de](https://bashutils.staropensource.de)

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#!/usr/bin/env bash
# STAROPENSOURCE BASHUTILS SOURCE FILE
# Copyright (c) 2024 The StarOpenSource bashutils Authors
# Licensed under the GNU Affero General Public License v3
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
#
# The copyright only protects the code from this line on until
# the "BASHUTILS CODE ENDS HERE" line. This notice is provided
# in case the bashutils script is embedded into a script file.
# The copyright notice above this notice does not apply the code
# above this notice or below the "BASHUTILS CODE ENDS HERE" line
# unless it licensed under the same license without modifications.
# Logging
function diag() { [ "${BASHUTILS_LOGLEVEL}" -lt 1 ] && echo -e "DIAG ${*//\\n/\\n }"; }
function verb() { [ "${BASHUTILS_LOGLEVEL}" -lt 2 ] && echo -e "VERB ${*//\\n/\\n }"; }
function sarn() { [ "${BASHUTILS_LOGLEVEL}" -lt 3 ] && echo -e "SARN ${*//\\n/\\n }"; }
function info() { [ "${BASHUTILS_LOGLEVEL}" -lt 4 ] && echo -e "INFO ${*//\\n/\\n }"; }
function warn() { [ "${BASHUTILS_LOGLEVEL}" -lt 5 ] && echo -e "WARN ${*//\\n/\\n }"; }
function error() { [ "${BASHUTILS_LOGLEVEL}" -lt 6 ] && echo -e "ERR! ${*//\\n/\\n }" &> /dev/stderr; }
function crash() {
[ "${1}" == "true" ] && CRASH_TERMINATE=true || CRASH_TERMINATE=false
shift
# shellcheck disable=SC2002
cat << EOF &> /dev/stderr
$([ "${CRASH_TERMINATE}" == "false" ] && echo "!!! This crash will not terminate the shell !!!")
-------------------------
sos!bashutils crash
-------------------------
Issuer
-> Line: $(caller)
-> Message: ${*}
Operating system
$(if [ -f "/etc/os-release" ]; then cat "/etc/os-release" | while read -r line; do echo " -> ${line}"; done; else echo "/etc/os-release does not exist"; fi)
Environment
$(for line in $(env); do echo " -> ${line}"; done)
Stacktrace
$(for index in $(seq 0 1000); do if [ -z "$(caller "${index}")" ]; then break; else echo " -> $(caller "${index}")"; fi; done)
-------------------------
sos!bashutils crash
-------------------------
$([ "${CRASH_TERMINATE}" == "false" ] && echo "!!! This crash will not terminate the shell !!!")
EOF
[ "${CRASH_TERMINATE}" == "true" ] && exit 69
}
# Utility methods
function set_undefined() { [ -z "${!1}" ] && export "${1}=${2}"; }
function set_defined() { [ -n "${!1}" ] && export "${1}=${2}"; }
function is_command_alias() { [ "$(type -t "${1}")" == "alias" ] && return 0 || return 1; }
function is_command_keyword() { [ "$(type -t "${1}")" == "keyword" ] && return 0 || return 1; }
function is_command_function() { [ "$(type -t "${1}")" == "function" ] && return 0 || return 1; }
function is_command_builtin() { [ "$(type -t "${1}")" == "builtin" ] && return 0 || return 1; }
function is_command_file() { [ "$(type -t "${1}")" == "file" ] && return 0 || return 1; }
function is_command_defined() { [ "$(type -t "${1}")" == "" ] && return 0 || return 1; }
# Initialize variables
set_undefined BASHUTILS_LOGLEVEL 3
################################
### BASHUTILS CODE ENDS HERE ###
################################

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/node_modules
/out
.docusaurus
.cache-loader
.DS_Store
.env.local
.env.development.local
.env.test.local
.env.production.local
pnpm-lock.yaml
npm-debug.log*
yarn-debug.log*
yarn-error.log*

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.PHONY: dist help
dist: help
help:
@echo "make install-deps -> Install all dependencies"
@echo " update-deps -> Update all dependencies"
@echo " test -> Start a web server for development"
@echo " build -> Build static files"
@echo " clean -> Clean directory"
@echo " clean-extra -> Clean directory with extra directories/files"
install-deps:
pnpm install
update-deps:
pnpm install @docusaurus/{core,plugin-client-redirects,plugin-content-docs,plugin-sitemap,preset-classic,module-type-aliases,tsconfig,types}@latest
test:
pnpm run start --hot-only --no-open
build:
pnpm run build --out-dir out
clean:
pnpm run clear
rm -rf "out" ".docusaurus" ".cache-loader"
clean-extra: clean
rm -rf "node_modules" "pnpm-lock.yaml"
# The nuclear option, dunno why I made this
clean-ultra: clean-extra
rm -rf "~/.cache/pnpm" "~/.local/share/pnpm" "~/.local/state/pnpm"

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# sos!engine documentation
The StarOpenSource Project uses [Docusaurus](https://docusaurus.io) for generating sos!engine's documentation.
# Commands
```bash
# Installs all required dependencies
make install-deps
# Starts a development server with support for hot reloading
make test
# Build the documentation to 'out/'
make build
# Remove 'out/' directory as well as some of Docusaurus' files
make clean
# If you want to remove node_modules and other pnpm stuff execute this
make clean-extra
```

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module.exports = {
presets: [require.resolve('@docusaurus/core/lib/babel/preset')],
};

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{
"label": "Features",
"position": 2,
"link": {
"type": "generated-index",
"description": "Documents bashutils' features."
}
}

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---
sidebar_position: 1
title: Checks
description: Shows how to use bashutils' built-in checking methods.
---
# Checks
Every program and script will have to check a condition at some point.
bashutils provides built-in methods for checking various bash-related things.
All methods only return either 0 or 1 and won't access stdin, stdout or stderr.
You can use them like this:
```bash
# Boilerplate code
if is_command_builtin "echo"; then
echo "'echo' is built into bash"
fi
if ! is_command_defined "setup"; then
echo "ERROR: 'setup' is undefined"
fi
# Simple code
is_command_builtin "echo" && echo "'echo'" is built into bash"
! is_command_defined "setup" && echo "ERROR: 'setup' is undefined"
```
## Command type checks
These check the type of the passed command and return `0` if it matches or `1` if it doesn't.
<table>
<tr>
<td>Checks for</td>
<td>Usage</td>
</tr>
<tr>
<td>Aliases</td>
<td><code>is_command_alias &lt;str:command name&gt;</code></td>
</tr>
<tr>
<td>Keywords</td>
<td><code>is_command_keyword &lt;str:command name&gt;</code></td>
</tr>
<tr>
<td>Functions</td>
<td><code>is_command_function &lt;str:command name&gt;</code></td>
</tr>
<tr>
<td>Builtins</td>
<td><code>is_command_builtin &lt;str:command name&gt;</code></td>
</tr>
<tr>
<td>Files (Binaries &amp; Scripts)</td>
<td><code>is_command_file &lt;str:command name&gt;</code></td>
</tr>
<tr>
<td>Anything</td>
<td><code>is_command_defined &lt;str:command name&gt;</code></td>
</tr>
</table>

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---
sidebar_position: 0
title: Logging
description: Describes bashutils' logging system.
---
# Logging
bashutils includes a fully SOSLS v2-compliant logging system
as well as a crash handler, for bad days.
In the table below you can see all log levels bashutils supports,
along with their ID and method. To print a message in a
particular level, invoke it's method and pass the
required arguments along.
<table>
<tr>
<td>NAME</td>
<td>ID</td>
<td>USAGE</td>
</tr>
<tr>
<td>Diagnostic</td>
<td>0</td>
<td><code>diag &lt;str:message&gt;</code></td>
</tr>
<tr>
<td>Verbose</td>
<td>1</td>
<td><code>verb &lt;str:message&gt;</code></td>
</tr>
<tr>
<td>Silent warning</td>
<td>2</td>
<td><code>sarn &lt;str:message&gt;</code></td>
</tr>
<tr>
<td>Informational</td>
<td>3</td>
<td><code>info &lt;str:message&gt;</code></td>
</tr>
<tr>
<td>Warning</td>
<td>4</td>
<td><code>warn &lt;str:message&gt;</code></td>
</tr>
<tr>
<td>Error</td>
<td>5</td>
<td><code>error &lt;str:message&gt;</code></td>
</tr>
</table>
## Crash handling
bashutils includes a fully functional crash handler.
It prints information about the operating system, environment, stack trace and of course the crash itself.
And, if you wish, it will terminate the script with code `69`.
To trigger a crash, simply invoke `crash <bool:terminate> <str:message>`.
## Customization
bashutils allows you to customize the logging system via environment variables.
### `BASHUTILS_LOGLEVEL`
Set it to the desired minimum log level ID. Defaults to `3` (informational).

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---
sidebar_position: 2
title: Variable definition
description: Decribes on how to define variables easily.
---
# Variable definition
Let's say that you have a set of environment variables the user
define before executing your script and want to define a default
value for them. You can do that easily by invoking either the
`set_undefined <str:variable> <str:value>` or
`set_defined <str:variable> <str:value>` method for setting
undefined or defined variables respectively.

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{
"label": "Introduction",
"position": 1,
"link": {
"type": "generated-index",
"description": "Provides an introduction into bashutils on how to use and set it up."
}
}

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---
sidebar_position: 1
title: Data types
description: Describes which data types bashutils uses and understands.
---
# Data types
This document describes which data types bashutils can understand.
## `bool`
Booleans. May only be `true` or `false`. `1` or `0` is not supported and will be treated as a number instead.
## `char`
Aa single character, for example `A`, `!` or even `シ`.
## `str`
A sequence of characters. This may be `Hello World!`, `I am an example text` or something entirely different.
## `byte`
Accepts numbers between `0` and `255`.
## `int`
Accepts numbers between `−9223372036854775807` and `9223372036854775807`. Any numbers outside of this range aren't representable by bash.
## Usage in arguments
You may see `<str:message>` or something across this documentation. The `str` in this example represents the expected data type, whilst `message` represents the argument name.

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---
sidebar_position: 0
title: Getting started
description: Walks you through on how to get started with sos!bashutils.
---
# Getting started
So, you want to use bashutils inside your project! That's nice.
## Warning
Please, **UNDER NO CIRCUMSTANCES**, include the source code of bashutils in your scripts directly.
Instead follow one of the methods provided below. This prevents you from doing stupid
things and allows you to update bashutils easier.
## Method 1 – `source`-ing
For this method, simply get the `bashutils.sh` from somewhere and then invoke
`source bashutils.sh` in your start script as soon as possible.
The best way to get the `bashutils.sh` file is to
`git clone https://git.staropensource.de/StarOpenSource/bashutils` or
`git submodule add https://git.staropensource.de/StarOpenSource/bashutils bashutils`
in your repository, working or some temporary directory. If that's not an option,
try downloading the script using `curl`, `wget` or some other download tool. If that's
not an option too, simply bundle the script. That should suffice.
This method is great for collections of scripts and is generally the recommended approach.
## Method 2 - Embedding into a script
For this method you have to either split your scripts
apart, so they can be con`cat`enated into one big script
with bashutils sandwhiched inbetween, or replace some
comment with the contents of the `bashutils.sh` file.
### Splitting a script
Let's say that you have a `src` directory with all of your script files
and a `build.sh` script in the repository root. For our example, let's say
that the contents of the `build.sh` file is the following:
```bash
#!/usr/bin/env bash
echo ":: Compiling"
rm -rf output.sh
# This comment is referenced later
echo "#!/usr/bin/env bash" > example.sh
cat src/init.sh >> example.sh
cat src/checks.sh >> example.sh
cat src/run.sh >> example.sh
chmod +x output.sh
```
To use bashutils in this project setup, simply
`git submodule add https://git.staropensource.de/StarOpenSource/bashutils bashutils`
in your repository and then add (or for this example replace the reference comment with) this line:
```bash
cat bashutils/bashutils.sh >> example.sh
```
Though you may need to modify this line to match your build script's code..
### Replacing a comment
Let's say that you have one *big* script file, like this <small>(for this example, this will suffice)</small>:
```bash
#!/usr/bin/env bash
echo "Hello World!"
echo "I'd like to exit now."
exit 1
```
To embed bashutils in this project setup, invoke
`git submodule add https://git.staropensource.de/StarOpenSource/bashutils bashutils`,
create a build script looking like this <small>(you may need to make some modifications to the variables)</small>:
```bash
#!/usr/bin/bash
SCRIPT="example.sh"
OUTFILE="output.sh"
BASHUTILS="bashutils/bashutils.sh"
# Exit on failure
set -euo pipefail
echo ":: Copying build file"
rm -rf "${OUTFILE}"
cp "${SCRIPT}" "${OUTFILE}"
echo ":: Adding bashutils"
sed -i \
-e "/\# bashutils init/r ${BASHUTILS}" \
-e "/\# bashutils init/d" \
${OUTFILE}
```
... and then modify your script to include a line containing `# bashutils init`, like this:
```bash
#!/usr/bin/env bash
# bashutils init
info "Hello World!"
diag "I'd like to exit now."
exit 1
```
To make your script useable, simply invoke the `build.sh` script and you should
your script fully working, with bashutils bundled inside.

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---
sidebar_position: 0
title: Welcome
description: Welcome to sos!bashutils' documentation!
---
# sos!bashutils documentation
Welcome to bashutils' documentation!
<!-- StarOpenSource Fly verification links -->
<link href="https://fly.staropensource.de/@staropensource" rel="me"/>
<link href="https://fly.staropensource.de/@sosengine" rel="me"/>
<!-- StarOpenSource Fly verification links -->
## What is it?
bashutils is a bash script providing useful utilities for your scripts.
It aims at reducing boilerplate, improving your scripts and making your life a lot easier.
## What features does it have?
bashutils has these features, with more to come:
- SOSLS v2-compliant logging system
- crash handler
- methods for checking various things
- easy variable definition

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import {themes as prismThemes} from "prism-react-renderer";
import type {Config} from "@docusaurus/types";
import type * as Preset from "@docusaurus/preset-classic";
const config: Config = {
title: "sos!bashutils",
url: "https://bashutils.staropensource.de",
baseUrl: "/",
favicon: "dist/staropensource.png",
trailingSlash: true,
i18n: {
defaultLocale: "en",
locales: [ "en" ],
},
noIndex: false,
onBrokenLinks: "throw",
onBrokenAnchors: "throw",
onBrokenMarkdownLinks: "throw",
onDuplicateRoutes: "warn",
/*
onBrokenLinks: "ignore",
onBrokenAnchors: "ignore",
onBrokenMarkdownLinks: "ignore",
onDuplicateRoutes: "ignore",
*/
tagline: "Provides some nice utility methods for bash scripts.",
themeConfig: {
docs: {
sidebar: {
hideable: true,
autoCollapseCategories: true,
},
},
navbar: {
title: "sos!bashutils",
logo: {
alt: "StarOpenSource Logo",
src: "dist/staropensource.png",
href: '/welcome',
},
items: [
{
type: "docSidebar",
sidebarId: "sidebar",
label: "Documentation",
position: "left",
},
{
href: "https://git.staropensource.de/StarOpenSource/bashutils",
label: "Source code",
position: "right",
},
],
},
footer: {
style: "dark",
copyright: `Copyright (c) ${new Date().getFullYear()} The StarOpenSource bashutils Authors<br/>Licensed under the GNU Affero General Public License version 3<br/>Documentation generated with <a href="https://docusaurus.io">Docusaurus</a>`,
},
prism: {
theme: prismThemes.github,
darkTheme: prismThemes.dracula,
additionalLanguages: [
'java',
'kotlin',
'groovy'
],
},
} satisfies Preset.ThemeConfig,
presets: [
[
"classic", {
debug: false,
docs: {
path: "docs",
editUrl: "https://git.staropensource.de/StarOpenSource/bashutils/_edit/develop/docs/",
editLocalizedFiles: false,
editCurrentVersion: true,
routeBasePath: "",
tagsBasePath: 'tags',
sidebarPath: "./sidebars.ts",
sidebarCollapsible: false,
sidebarCollapsed: false,
showLastUpdateAuthor: true,
showLastUpdateTime: true,
breadcrumbs: true,
includeCurrentVersion: true,
},
sitemap: {
changefreq: "monthly",
priority: 0.5,
filename: "sitemap.xml",
},
theme: {
customCss: "./src/css/custom.css",
},
} satisfies Preset.Options,
],
],
plugins: [
[
"@docusaurus/plugin-client-redirects",
{
fromExtensions: ["html", "htm", "php"],
redirects: [
{
from: ["/", "/index"],
to: "/welcome",
},
],
},
],
],
markdown: {
format: "detect",
mermaid: false,
},
staticDirectories: ["static"],
titleDelimiter: "»",
baseUrlIssueBanner: true,
};
export default config;

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{
"name": "docs",
"version": "0.0.0",
"private": true,
"scripts": {
"docusaurus": "docusaurus",
"start": "docusaurus start",
"build": "docusaurus build",
"swizzle": "docusaurus swizzle",
"deploy": "docusaurus deploy",
"clear": "docusaurus clear",
"serve": "docusaurus serve",
"write-translations": "docusaurus write-translations",
"write-heading-ids": "docusaurus write-heading-ids",
"typecheck": "tsc"
},
"dependencies": {
"@docusaurus/core": "3.5.2",
"@docusaurus/plugin-client-redirects": "^3.5.2",
"@docusaurus/plugin-content-docs": "^3.5.2",
"@docusaurus/plugin-sitemap": "^3.5.2",
"@docusaurus/preset-classic": "3.5.2",
"@mdx-js/react": "^3.0.1",
"clsx": "^2.1.0",
"prism-react-renderer": "^2.3.1",
"react": "^18.2.0",
"react-dom": "^18.2.0"
},
"devDependencies": {
"@docusaurus/module-type-aliases": "3.5.2",
"@docusaurus/tsconfig": "3.5.2",
"@docusaurus/types": "3.5.2",
"@types/node": "^20.12.5",
"typescript": "~5.4.4"
},
"browserslist": [
">0.5%",
"not dead",
"not op_mini all",
"last 3 version",
"Firefox ESR"
],
"engines": {
"node": ">=18.0"
}
}

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import type {SidebarsConfig} from '@docusaurus/plugin-content-docs';
const sidebars: SidebarsConfig = {
sidebar: [{type: 'autogenerated', dirName: '.'}],
// But you can create a sidebar manually
/*
tutorialSidebar: [
'intro',
'hello',
{
type: 'category',
label: 'Tutorial',
items: ['tutorial-basics/create-a-document'],
},
],
*/
};
export default sidebars;

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:root {
--ifm-color-primary: #d60532;
--ifm-color-primary-dark: #c4052e;
--ifm-color-primary-darker: #af072b;
--ifm-color-primary-darkest: #990525;
--ifm-color-primary-light: #db1943;
--ifm-color-primary-lighter: #ec2c56;
--ifm-color-primary-lightest: #fa3e67;
--ifm-code-font-size: 95%;
--docusaurus-highlighted-code-line-bg: rgba(0, 0, 0, 0.1);
}
/* For readability concerns, you should choose a lighter palette in dark mode.
JeremyStarTM: Readability concerns? Fuck that shit. */
[data-theme='dark'] {
--ifm-color-primary: #d60532;
--ifm-color-primary-dark: #c4052e;
--ifm-color-primary-darker: #af072b;
--ifm-color-primary-darkest: #990525;
--ifm-color-primary-light: #db1943;
--ifm-color-primary-lighter: #ec2c56;
--ifm-color-primary-lightest: #fa3e67;
--docusaurus-highlighted-code-line-bg: rgba(0, 0, 0, 0.3);
}

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../../../dist/assets/staropensource.png

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{
// This file is not used in compilation. It is here just for a nice editor experience.
"extends": "@docusaurus/tsconfig",
"compilerOptions": {
"jsx": "react",
"baseUrl": "."
}
}