Add initial boilerplate files
This commit is contained in:
rwxrob
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Developer Certificate of Origin
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Version 1.1
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Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
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1 Letterman Drive
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||||||
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Suite D4700
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||||||
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San Francisco, CA, 94129
|
||||||
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|
||||||
|
Everyone is permitted to copy and distribute verbatim copies of this
|
||||||
|
license document, but changing it is not allowed.
|
||||||
|
|
||||||
|
Developer's Certificate of Origin 1.1
|
||||||
|
|
||||||
|
By making a contribution to this project, I certify that:
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||||||
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|
||||||
|
(a) The contribution was created in whole or in part by me and I
|
||||||
|
have the right to submit it under the open source license
|
||||||
|
indicated in the file; or
|
||||||
|
|
||||||
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(b) The contribution is based upon previous work that, to the best
|
||||||
|
of my knowledge, is covered under an appropriate open source
|
||||||
|
license and I have the right under that license to submit that
|
||||||
|
work with modifications, whether created in whole or in part
|
||||||
|
by me, under the same open source license (unless I am
|
||||||
|
permitted to submit under a different license), as indicated
|
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in the file; or
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||||||
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|
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(c) The contribution was provided directly to me by some other
|
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person who certified (a), (b) or (c) and I have not modified
|
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it.
|
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|
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(d) I understand and agree that this project and the contribution
|
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are public and that a record of the contribution (including all
|
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personal information I submit with it, including my sign-off) is
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maintained indefinitely and may be redistributed consistent with
|
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this project or the open source license(s) involved.
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@ -0,0 +1,201 @@
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Apache License
|
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|
Version 2.0, January 2004
|
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|
http://www.apache.org/licenses/
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|
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
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END OF TERMS AND CONDITIONS
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|
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APPENDIX: How to apply the Apache License to your work.
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|
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|
To apply the Apache License to your work, attach the following
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boilerplate notice, with the fields enclosed by brackets "{}"
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replaced with your own identifying information. (Don't include
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Copyright 2020 Rob Muhlestein
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||||||
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|
||||||
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
|
||||||
|
limitations under the License.
|
||||||
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|
@ -0,0 +1,92 @@
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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`,
|
||||||
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`_filterbuf`, `_have`, etc.)
|
||||||
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|
||||||
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## Usage
|
||||||
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|
||||||
|
```
|
||||||
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command
|
||||||
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command usage
|
||||||
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command help [<cmd>]
|
||||||
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command foo [<arg>]
|
||||||
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command bar [<arg>]
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||||||
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```
|
||||||
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||||||
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## Commands
|
||||||
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||||||
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| Command | Summary |
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||||||
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| :-: | - |
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||||||
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| [usage] | Display single line summary of all command usage |
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||||||
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| [help] | Display help information |
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||||||
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| [foo] | Do the foo |
|
||||||
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| [bar] | Do the bar |
|
||||||
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|
||||||
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[usage]: #usage
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||||||
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[help]: #help
|
||||||
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[foo]: #foo
|
||||||
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[bar]: #bar
|
||||||
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|
||||||
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### `usage`
|
||||||
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|
||||||
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The `usage` command displays a summary of usage.
|
||||||
|
|
||||||
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### `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`
|
||||||
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|
||||||
|
The `foo` command foos.
|
||||||
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|
||||||
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## `bar`
|
||||||
|
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||||||
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The `bar` command bars.
|
||||||
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|
||||||
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## Dependencies
|
||||||
|
|
||||||
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Required:
|
||||||
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|
||||||
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* Bash 4+
|
||||||
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|
||||||
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Optional:
|
||||||
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|
||||||
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* `pandoc` - for rich help docs
|
||||||
|
|
||||||
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## 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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@ -0,0 +1,145 @@
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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 $?
|
||||||
|
fi
|
||||||
|
done
|
||||||
|
fi
|
||||||
|
|
||||||
|
x_usage "$@"
|
||||||
Loading…
Reference in New Issue