Iron

the fe shell

This is free software with ABSOLUTELY NO WARRANTY.

Even in all its glory, your codebase will inevitably make you want to gouge your eyes out. It will demand you recite arcane incantations. You will need to coax it to finish a simple task. It will be best friends with your teammates and visciously stab you behind your back when you need it most. It will be the bicycle you forget how to ride.

Iron will let you keep your eyes. You can forget the incantations. It will do the coaxing, be your friend, and show you where the bicycle's pedals are lest you forget.

Your scripts will be listed in a menu like the examples below. Enter the items you want and Iron will execute them in order. Should anything fail, execution stops. The last menu item chosen will be highlighted.

Contents

• the fe shell
• Examples
  • Example Menu
  • Extended Menu
  • Script Help
  • Execution Stops on Failure
• Try It
• Get It
• Use It
• Customize It

Examples

Example Menu

Here's an example for a codebase with two scripts test-success and test-failure:

iron: the fe shell
https://github.com/formwork-io/iron
This is free software with ABSOLUTELY NO WARRANTY.

Usage: <menu item>...
Try 'help' for more information.

Entering the shell, [CTRL-C] to exit.

1: test-success
2: test-failure


iron (?|#|#?)>

Extended Menu

Here's an example showing the same scripts in the extended menu via ?:

iron (?|#|#?)> ?

1: test-success:    Mimic a successful script.
2: test-failure:    Mimic a failing script.

Script Help

Here's an example showing a script's help via 1?:

iron (?|#|#?)> 1?

1: test-success:    Mimic a successful script.
2: test-failure:    Mimic a failing script.
01-test-success.sh

**NAME**
       test-success

**HELP**
       Mimic a successful script.

**EXTENDED HELP**
       This script has no extended help.

Execution Stops on Failure

The fe shell executes scripts in order. Should a script fail, execution will stop. In the following example, the third script is not run as the previous script fails:

iron (?|#|#?)> 1 2 1
(01-test-success.sh)
Pretending to do something... SUCCESS
(02-test-failure.sh)
Pretending to do something... FAILED

(02-test-failure.sh failed)
iron (?|#|#?)>

Try It

A modern version of the GNU Bash shell and the Readline Library wrapper rlwrap are required. Then paste this into your terminal:

git clone https://github.com/formwork-io/iron.git
cd iron
./try-examples.sh

Get It

The fe shell is composed of a few files at the root of your codebase:

.
|-- .iron.sh
|-- env.sh
|-- fe.sh
\-- scripts
    |-- fe.sh

1 directory, 4 files

You can get them easily by running the overlay script from the root of your codebase:

cd my-project
wget --content-disposition \
     https://raw.githubusercontent.com/formwork-io/iron/latest/overlay.sh
bash overlay.sh

Take a look at your version control status (e.g., git status) to see exactly what the effect was.

Use It

Add executable scripts to the scripts directory, folowing this convention:

scripts/01-<script_name>.sh
scripts/02-<script_name>.sh

For example:

scripts/01-clean.sh
scripts/02-build.sh
scripts/03-deploy.sh

Each script should have four lines included at the top immediately following the interpreter directive:

#!/usr/bin/env bash
export SCRIPT_NAME="example"
export SCRIPT_HELP="Short summary of what this script does."
export SCRIPT_EXTENDED_HELP="Extended help for this script... "
[[ "$GOGO_IRON_SOURCE" -eq 1 ]] && return 0

The variable exports aren't strictly required though the following line should absolutely be included:

[[ "$GOGO_IRON_SOURCE" -eq 1 ]] && return 0

This prevents the script from running any further when the fe shell sources the script to create its menus.

Customize It

IRON_PROMPT

Change the fe shell prompt.

For example:

IRON_PROMPT="the fe shell: examples> " ./try-examples.sh

iron: the fe shell
https://github.com/formwork-io/iron
This is free software with ABSOLUTELY NO WARRANTY.

Usage: <menu item>...
Try 'help' for more information.

Entering the shell, [CTRL-C] to exit.

1: test-success
2: test-failure
3: test-sleep-success
4: test-sleep-and-fail
5: test-close-stdin
6: test-close-stdout
7: test-submenu

the fe shell: examples>

IRON_SCRIPTS

Change where the fe shell looks for scripts. For example, here's a fe shell script that behaves like an admin submenu:

#!/usr/bin/env bash
export SCRIPT_HELP="Access administrative menu."
export SCRIPT_NAME="admin"
[[ "$GOGO_IRON_SOURCE" -eq 1 ]] && return 0

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
IRON_SCRIPTS="$DIR"/admin IRON_PROMPT="admin iron (?|#|#?)> " $IRON_PATH
exit 0