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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
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# Bash Command Boilerplate
This is a GitHub template repo that will be copied instead of forked
to create a new Bash command. Obviously, not all of this is needed for
many Bash scripts, but anything with more than two subcommands will
benefit from the builtin tab completion, embedded Markdown help
documentation support, and included functions (`usage`, `_filter`,
`_filterbuf`, `_have`, etc.)
## Usage
```
command
command usage
command help [<cmd>]
command foo [<arg>]
command bar [<arg>]
```
## Commands
| Command | Summary |
| :-: | - |
| [usage] | Display single line summary of all command usage |
| [help] | Display help information |
| [foo] | Do the foo |
| [bar] | Do the bar |
[usage]: #usage
[help]: #help
[foo]: #foo
[bar]: #bar
### `usage`
The `usage` command displays a summary of usage.
### `help`
The help command prints help information. If no argument is passed
displays general help information (main). Otherwise, the documentation
for the specific argument keyword is displayed, which usually
corresponds to a command name (but not necessarily). All documentation
is written in CommonMark (Markdown) and will displayed as Web page if
`pandoc` and `$HELP_BROWSER` are detected, otherwise, just the Markdown is
sent to `$PAGER` (default: `more`).
## `foo`
The `foo` command foos.
## `bar`
The `bar` command bars.
## Dependencies
Required:
* Bash 4+
Optional:
* `pandoc` - for rich help docs
## Justification
Bash is the dominate shell scripting language and the official default
Linux interactive shell, which reduces cognitive overhead; every command
line *is* a line of code that could be put into script as is. Bash
scripts are at the core of cloud, containers, and Kubernetes. Bash 4+
with its associative array support, powerful regular expressions, and
multiple ways of feeding data to loops easily covers the needs
previously requiring Python and Perl scripts. Bash scripts are also much
more powerful, safer, flexible, and performant than POSIX shell or Zsh.
## Caveats
* Use the official bash path: `#!/usr/bin/bash`
* Using `#!/usr/bin/env bash` introduces unnecessary risk
* Always set the acceptable `PATH` at beginning of script
* Always check script with [`shellcheck`] before releasing
* Always use `bc` for *any* floating point math
[`shellcheck`]: <https://www.shellcheck.net>
## Legal
Copyright 2021 Rob Muhlestein <rob@rwx.gg>
Released under Apache-2.0 License
Please mention <https://youtube.com/rwxrob>

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#!/usr/bin/bash
# shellcheck disable=SC2016
set -e
export PATH="/usr/bin:/usr/local/bin"
# Copyright 2021 Rob Muhlestein <rob@rwx.gg>
# Released under Apache-2.0 license
# Please mention https://youtube.com/rwxrob
(( BASH_VERSINFO[0] < 4 )) && echo "Bash 4+ required." && exit 1
: "${PAGER:=more}"
: "${EDITOR:=vi}"
: "${HELP_BROWSER:=}"
EXE="${0##*/}"
declare -A help # associative arrays *require* declaration
help[main]='
This snippet contains the scaffolding for Bash tab completion using
the complete -C foo foo variation which allows scripts to complete
themselves (rather than having another script somewhere to manage). To
use it simply add a function with the additional command and add the
name of it to the commands array declaration at the top of the script.
Then add complete -C foo foo (or something like it) to your bashrc.
Begin functions with x_ to allow useful command names to be used that
would otherwise conflict with existing system and bash keywords. Begin
functions with x__ when you do not want them to appear with tab
completion, but still want them to be avaiable, just hidden.
'
help[foo]='The `foo` command foos.'
x_foo() {
_filter "$@" && return $?
echo "would foo: $*"
}
help[bar]='The `bar` command bars.'
x_bar() {
_filterbuf "$@" && return $?
echo "would bar: $*"
}
x__hidden() {
_filter "$@" && return $?
echo "would run _hidden: $*"
}
help[usage]='The `usage` command displays a summary of usage.'
x_usage() {
local -a cmds
for c in "${COMMANDS[@]}"; do
[[ ${c:0:1} =~ _ ]] && continue
cmds+=($c)
done
cmds="${cmds[*]}"
printf "usage: %s (%s)\n" "$EXE" "${cmds// /|}"
}
help[help]='
The `help` command prints help information. If no argument is passed
displays general help information (main). Otherwise, the documentation
for the specific argument keyword is displayed, which usually
corresponds to a command name (but not necessarily). All documentation
is written in CommonMark (Markdown) and will displayed as Web page if
`pandoc` and `$HELP_BROWSER` are detected, otherwise, just the Markdown is
sent to `$PAGER` (default: more).'
x_help() {
local name="$1"
if [[ -z "$name" ]];then
for c in "${COMMANDS[@]}";do
x_help "$c" buildonly
done
x_help main
return 0
fi
local title="$EXE $name"
[[ $name = main ]] && title="$EXE"
local file="/tmp/help-$EXE-$name.html"
if _have pandoc ; then
if _have "$HELP_BROWSER" && [[ -t 1 ]] ;then
pandoc -s --metadata title="$title" \
-o "$file" <<< "${help[$name]}"
[[ -z "$2" ]] && cd /tmp && exec "$HELP_BROWSER" "$file"
return 0
fi
pandoc -s --metadata title="$title" \
-t plain <<< "${help[$name]}" | "$PAGER"
return 0
fi
echo "${help[$name]}" | "$PAGER"
}
# --------------------- completion and delegation --------------------
_have(){ type "$1" &>/dev/null; }
_filter(){
[[ -n "$1" ]] && return 1
while IFS= read -ra args; do
"${FUNCNAME[1]}" "${args[@]}"
done
}
_filterbuf() {
[[ -n "$1" ]] && return 1
"${FUNCNAME[1]}" "$(</dev/stdin)"
}
while IFS= read -r line; do
[[ $line =~ ^declare\ -f\ x_ ]] || continue
COMMANDS+=( "${line##declare -f x_}" )
done < <(declare -F)
if [[ -n $COMP_LINE ]]; then
line=${COMP_LINE#* }
for c in "${COMMANDS[@]}"; do
[[ ${c:0:${#line}} == "${line,,}" && ${c:0:1} != _ ]] && echo "$c"
done
exit
fi
for c in "${COMMANDS[@]}"; do
if [[ $c == "$EXE" ]]; then
"x_$EXE" "$@"
exit $?
fi
done
if [[ -n "$1" ]]; then
declare cmd="$1"; shift
for c in "${COMMANDS[@]}"; do
if [[ $c == "$cmd" ]]; then
"x_$cmd" "$@"
exit $?
fi
done
fi
x_usage "$@"