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template-bash-command
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Add README.md generation, closes #4

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rwxrob 2021-08-10 18:47:07 -04:00
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README.md
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@ -1,4 +1,6 @@
# Bash Command Template
# Bash Template Command
*This `README.md` is [autogenerated](#generate-readme-md-file).*
This is a GitHub template repo that will be copied instead of forked to
create a new Bash command with a command something like this:
@ -7,16 +9,13 @@ create a new Bash command with a command something like this:
gh repo create rwxrob/mycmd -p rwxrob/template-bash-command
```
This `command` inside can then be renamed and finished.
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`, `_buffer`, `_have`, etc.)
## Installation
It's usually easiest to install by cloning the repo and adding the full
path to this repo to your `PATH`. That way you can keep up with updates.
## Naming Conventions
* Name repos containing single bash commands with `cmd-`
@ -24,52 +23,6 @@ path to this repo to your `PATH`. That way you can keep up with updates.
* Start command functions with `command_` to be completed
* Start command functions with `command__` to not be completed
## 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:
@ -107,3 +60,45 @@ Copyright 2021 Rob Muhlestein <rob@rwx.gg>
Released under Apache-2.0 License
Please mention <https://youtube.com/rwxrob>
----
## Commands
### The `bar` Command
Bars.
### The `foo` Command
Foos.
### Display Help Information
```
help [<command>]
```
Displays specific 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
GitHub Flavored Markdown and will displayed as a web page if `pandoc`
and `$HELP_BROWSER` are detected, otherwise, just the Markdown is sent
to `$PAGER` (default: more).
Also see `readme` and `usage` commands.
### Generate `README.md` File
```
command readme > README.md
```
The `readme` command will output the embedded help documentation in raw
GitHub Flavored Markdown suitable for use as a `README.md` file on
GitHub or similar hosting service.
### The `usage` Command
Displays a summary of usage.

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command
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@ -1,11 +1,7 @@
#!/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
# export PATH="/usr/bin:/usr/local/bin" # safer, if you can
(( BASH_VERSINFO[0] < 4 )) && echo "Bash 4+ required." && exit 1
@ -18,27 +14,78 @@ EXE="${0##*/}"
declare -A help # associative arrays *require* declaration
help[main]='
# Sample Bash Template Command
# Bash Template Command
This `command` 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` to your bashrc. Begin functions with
`command_` to allow useful command names to be used that would otherwise
conflict with existing system and bash keywords. Begin functions with
`command__` when you do not want them to appear with tab completion, but
still want them to be available, just hidden.'
*This `README.md` is autogenerated.*
help[foo]='The `foo` command foos.'
This is a GitHub template repo that will be copied instead of forked to
create a new Bash command with a command something like this:
```
gh repo create rwxrob/mycmd -p rwxrob/template-bash-command
```
This `command` inside can then be renamed and finished.
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`, `_buffer`, `_have`, etc.)
## Naming Conventions
* Name repos containing single bash commands with `cmd-`
* Name template repos beginning with `template-`
* Start command functions with `command_` to be completed
* Start command functions with `command__` to not be completed
## 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>
'
help[foo]='Foos.'
command_foo() {
_filter "$@" && return $?
echo "would foo: $*"
}
help[bar]='The `bar` command bars.'
help[bar]='Bars.'
command_bar() {
_buffer "$@" && return $?
@ -50,7 +97,7 @@ command__hidden() {
echo "would run _hidden: $*"
}
help[usage]='The `usage` command displays a summary of usage.'
help[usage]='Displays a summary of usage.'
command_usage() {
local -a cmds
@ -63,27 +110,25 @@ command_usage() {
}
help[help]='
# The `help` Command
# Display Help Information
The `help` command prints help information. If no argument is passed
displays general help information (main). Otherwise, the documentation
for the specific argument keyword is displayed, which usually
corresponds to a command name (but not necessarily). All documentation
is written in CommonMark (Markdown) and will displayed as Web page if
`pandoc` and `$HELP_BROWSER` are detected, otherwise, just the Markdown is
sent to `$PAGER` (default: more).'
```
help [<command>]
```
Displays specific help information. If no argument is passed displays
general help information (main). Otherwise, the documentation for the
specific argument keyword is displayed, which usually corresponds to
a command name (but not necessarily). All documentation is written in
GitHub Flavored Markdown and will displayed as a web page if `pandoc`
and `$HELP_BROWSER` are detected, otherwise, just the Markdown is sent
to `$PAGER` (default: more).
Also see `readme` and `usage` commands.
'
command_help() {
local name="$1"
if [[ -z "$name" ]];then
for c in "${COMMANDS[@]}";do
[[ ${c:0:1} = _ ]] && continue;
command_help "$c" buildonly || true
done
command_help main
return 0
fi
local title own body
local name="${1:-main}" title own body
title=$(_help_title "$name")
if [[ -z "$title" ]]; then
body="${help[$name]}"
@ -109,6 +154,30 @@ command_help() {
echo -e "$title\n\n$body" | "$PAGER"
}
help[readme]='
# Generate `README.md` File
```
command readme > README.md
```
The `readme` command will output the embedded help documentation in raw
GitHub Flavored Markdown suitable for use as a `README.md` file on
GitHub or similar hosting service. '
command_readme() {
_trim "${help[main]}"
local usage="$(command_usage)"
printf "\n----\n\n## Commands\n\n"
local -a names=("${!help[@]}")
while IFS= read -r name; do
[[ $name = main ]] && continue
local body=$(_trim "${help[$name]}")
[[ $body =~ ^\# ]] || body="# The \`$name\` Command\n\n$body"
printf "##$body\n\n"
done < <(printf "%s\n" "${!help[@]}" | LC_COLLATE=C sort)
}
# --------------------- completion and delegation --------------------
# (better than . <(foo bloated_completion) in .bashrc)
@ -122,6 +191,11 @@ _help_title() {
done <<< "${help[$name]}"
}
_trim() {
local it="${1#"${1%%[![:space:]]*}"}"
echo -e "${it%"${it##*[![:space:]]}"}"
}
_have(){ type "$1" &>/dev/null; }
_filter(){
@ -140,6 +214,7 @@ while IFS= read -r line; do
[[ $line =~ ^declare\ -f\ command_ ]] || continue
COMMANDS+=( "${line##declare -f command_}" )
done < <(declare -F)
COMMANDS=($(LC_COLLATE=C sort < <(printf "%s\n" "${COMMANDS[@]}")))
if [[ -n $COMP_LINE ]]; then
line=${COMP_LINE#* }