spyrun - file watcher and command executor

spyrun is a tool that watches files and executes commands when specific events occur. It can watch for file modifications, additions, and more.

Installation

cargo install spyrun

Usage

spyrun operates using a configuration file.

> spyrun --help
Usage: spyrun.exe [OPTIONS]

Options:
  -c, --config <FILE>  Sets a custom config file [default: spyrun.toml]
  -d, --debug...       Turn debugging information on
  -h, --help           Print help
  -V, --version        Print version

Configuration File

spyrun's configuration file is in TOML format. The default filename is spyrun.toml, located in the same directory as the executable. The configuration file specifies the files to watch, the commands to execute, and various other options.

• example

[vars]
base = '{{ cwd }}/example'
hostname = '{{ env(arg="COMPUTERNAME") }}'
version = '20240407_125639'
fn_toast = '''
function Show-Toast {
  [CmdletBinding()]
  param(
    [Parameter(Mandatory=$true)][String]$title,
    [Parameter(Mandatory=$true)][String]$message,
    [Parameter(Mandatory=$true)][String]$detail
  )
  [Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null
  [Windows.UI.Notifications.ToastNotification, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null
  [Windows.Data.Xml.Dom.XmlDocument, Windows.Data.Xml.Dom.XmlDocument, ContentType = WindowsRuntime] | Out-Null

  $app_id = '{1AC14E77-02E7-4E5D-B744-2EB1AE5198B7}\WindowsPowerShell\v1.0\powershell.exe'
  $content = @"
<?xml version="1.0" encoding="utf-8"?>
<toast>
    <visual>
        <binding template="ToastGeneric">
            <text>$($title)</text>
            <text>$($message)</text>
            <text>$($detail)</text>
        </binding>
    </visual>
</toast>
"@
  $xml = New-Object Windows.Data.Xml.Dom.XmlDocument
  $xml.LoadXml($content)
  $toast = New-Object Windows.UI.Notifications.ToastNotification $xml
  [Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier($app_id).Show($toast)
}
'''

[cfg]
stop_flg = '{{ base }}/stop.flg'
stop_force_flg = '{{ base }}/stop.force.flg'
max_threads = 8

[log]
path = '{{ base }}/log/{{ cmd_stem }}.log'
level = 'info'

[init]
cmd = 'powershell'
arg = ['-NoProfile', '-Command', '''& {
  {{ fn_toast }}
  Show-Toast -title "spyrun {{ version }} on {{ hostname }}" -message "spyrun is running" -detail "spyrun path is {{ cmd_path }}. config path is {{ cfg_path }}."
}''']

# watch files and notifiy.
[[spys]]
name = 'toast'
input = '{{ base }}/watch_dir'
output = '{{ base }}/log'
[[spys.patterns]]
pattern = '\.txt$'
cmd = 'powershell'
arg = ['-NoProfile', '-Command', '''& {
  {{ fn_toast }}
  Show-Toast -title "{{ event_name }}" -message "{{ event_path }} is {{ event_kind }}" -detail "name: {{ event_name }}. dir: {{ event_dir }}"
}''']

[vars]

Variables can be set freely. Variables are defined in alphabetical order. Therefore, it is necessary to pay attention to the order.

• OK

[vars]
a = "a"
b = "b and {{ a }}"

• NG

[vars]
a = "a and {{ b }}"
b = "b"

[cfg]

stop_flg

The file path to stop the spyrun. When it detects that this path has been created or modified, it completes all running operations and exits.

stop_force_flg

The file path to force stop the spyrun. When it detects that this path has been created or modified, it forces the spyrun to stop immediately.

max_threads

The maximum number of threads to use in the spyrun. The default value is based on the number of CPU cores.

[log]

path

The path to the log file.

level

The log level. The default value is info. You can specify the following values.

• off
• error
• warn
• info
• debug
• trace

[init]

Init is executed when spyrun starts.

cmd

The command to execute.

arg

The arguments to pass to the command.

[[spys]]

The list of spy.

name

The name of the spy.

events

The list of events. Default value is ['Create', 'Modify']. You can specify the following values.

• Access
• Create
• Modify
• Remove

input

The path to watch.

output

The path to output. Standard output and standard error is written to this path.

recursive

If you want to watch the input path recursively, set this to true. Default value is false.

debounce

If you want to debounce execution, set this setting. Default value is 50 milliseconds.

throttle

If you want to throttle execution, set this setting. Default value is 0 milliseconds.

limitkey

debounce or throttle is applied to this key. Default value is Display for CommandInfo.

delay

The delay to wait before executing the command. Default value is 0 milliseconds.

• one param

Execute after 5000 milliseconds.

delay = [5000]

• two params

Waits randomly between 5000 milliseconds and 10000 milliseconds before executing.

delay = [5000, 10000]

[[spys.patterns]]

The list of patterns.

pattern

The pattern to watch. This is a regular expression.

cmd

The command to execute.

arg

The arguments to pass to the command.

[spys.poll]

If you want to watch the input path in a polling mode, set this setting.

interval

The interval to watch the input path.

[spys.walk]

If you want to walk the input path, set this setting. If this is set, the input path is also walked when spyrun starts.

min_depth

The minimum depth to walk the input path.

max_depth

The maximum depth to walk the input path.

follow_symlinks

If you want to follow symlinks, set this setting.

pattern

The pattern to match the input path. This is a regular expression.

delay

The delay to wait before walking the input path.

• one param

Walk after 5000 milliseconds.

delay = [5000]

• two params

Waits randomly between 5000 milliseconds and 10000 milliseconds.

delay = [5000, 10000]

License

spyrun is distributed under the MIT License.