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https://github.com/captncodr/fli
Execute CLI commands from your F# code in F# style!
https://github.com/captncodr/fli
cli command-line computation-expressions fsharp process shell
Last synced: 19 days ago
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Execute CLI commands from your F# code in F# style!
- Host: GitHub
- URL: https://github.com/captncodr/fli
- Owner: CaptnCodr
- License: mit
- Created: 2022-09-26T13:16:00.000Z (about 2 years ago)
- Default Branch: main
- Last Pushed: 2024-04-16T13:11:27.000Z (7 months ago)
- Last Synced: 2024-05-15T21:02:06.834Z (6 months ago)
- Topics: cli, command-line, computation-expressions, fsharp, process, shell
- Language: F#
- Homepage:
- Size: 794 KB
- Stars: 147
- Watchers: 2
- Forks: 4
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
README
# Fli
[](https://github.com/CaptnCodr/Fli/actions/workflows/build.yml)
[](https://www.nuget.org/packages/Fli/)
Execute CLI commands from your F# code in F# style!
**Fli is part of the F# Advent Calendar 2022: [A little story about Fli](https://gist.github.com/CaptnCodr/d709b30eb1191bedda090623d04bf738)**
### Features
- Starting processes easily
- Execute CLI commands in your favourite shell
- F# computation expression syntax
- Wrap authenticated CLI tools
- No external dependencies
### Install
Get it from [Nuget](https://www.nuget.org/packages/Fli/): `dotnet add package Fli`
### Usage
`open Fli` and start
For example:
```fsharp
cli {
Shell CMD
Command "echo Hello World!"
}
|> Command.execute
```
that starts `CMD.exe` as Shell and `echo Hello World!` is the command to execute.
Run a file with PowerShell from a specific directory:
```fsharp
cli {
Shell PWSH
Command "test.bat"
WorkingDirectory (Environment.GetFolderPath Environment.SpecialFolder.UserProfile)
}
|> Command.execute
```
Executing programs with arguments:
```fsharp
cli {
Exec "path/to/executable"
Arguments "--info"
}
|> Command.execute
```
an example with `git`:
```fsharp
cli {
Exec "git"
Arguments ["commit"; "-m"; "\"Fixing issue #1337.\""]
}
|> Command.execute
```
Add a verb to your executing program:
```fsharp
cli {
Exec "adobe.exe"
Arguments (Path.Combine ((Environment.GetFolderPath Environment.SpecialFolder.UserProfile), "test.pdf"))
Verb "open"
}
|> Command.execute
```
or open a file in the default/assigned program:
```fsharp
cli {
Exec "test.pdf"
}
|> Command.execute
```
(Hint: if file extension is not assigned to any installed program, it will throw a `System.NullReferenceException`)
Write output to a specific file:
```fsharp
cli {
Exec "dotnet"
Arguments "--list-sdks"
Output @"absolute\path\to\dotnet-sdks.txt"
}
|> Command.execute
```
Write output to a function (logging, printing, etc.):
```fsharp
let log (output: string) = Debug.Log($"CLI log: {output}")
cli {
Exec "dotnet"
Arguments "--list-sdks"
Output log
}
|> Command.execute
```
Add environment variables for the executing program:
```fsharp
cli {
Exec "git"
EnvironmentVariables [("GIT_AUTHOR_NAME", "Jon Doe"); ("GIT_AUTHOR_EMAIL", "[email protected]")]
Output ""
}
|> Command.execute
```
Hint: `Output ""` will be ignored. This is for conditional cases, e.g.: `Output (if true then logFilePath else "")`.
Add credentials to program:
```fsharp
cli {
Exec "program"
Credentials ("domain", "bobk", "password123")
}
|> Command.execute
```
Hint: Running a process as a different user is supported on all platforms. Other options (Domain, Password) are only available on Windows. As an alternative for not Windows based systems there is:
```fsharp
cli {
Exec "path/to/program"
Username "admin"
}
|> Command.execute
```
For Windows applications it's possible to set their visibility. There are four possible values: `Hidden`, `Maximized`, `Minimized` and `Normal`. The default is `Hidden`.
```fsharp
cli {
Exec @"C:\Windows\regedit.exe"
WindowStyle Normal
}
|> Command.execute
```
#### `Command.execute`
`Command.execute` returns record: `type Output = { Id: int; Text: string option; ExitCode: int; Error: string option }`
which has getter methods to get only one value:
```fsharp
toId: Output -> int
toText: Output -> string
toExitCode: Output -> int
toError: Output -> string
```
example:
```fsharp
cli {
Shell CMD
Command "echo Hello World!"
}
|> Command.execute // { Id = 123; Text = Some "Hello World!"; ExitCode = 0; Error = None }
|> Output.toText // "Hello World!"
// same with Output.toId:
cli { ... }
|> Command.execute // { Id = 123; Text = Some "Hello World!"; ExitCode = 0; Error = None }
|> Output.toId // 123
// same with Output.toExitCode:
cli { ... }
|> Command.execute // { Id = 123; Text = Some "Hello World!"; ExitCode = 0; Error = None }
|> Output.toExitCode // 0
// in case of an error:
cli { ... }
|> Command.execute // { Id = 123; Text = None; ExitCode = 1; Error = Some "This is an error!" }
|> Output.toError // "This is an error!"
```
#### `Output` functions
```fsharp
throwIfErrored: Output -> Output
throw: (Output -> bool) -> Output -> Output
```
`Output.throw` and `Output.throwIfErrored` are assertion functions that if something's not right it will throw an exception.
That is useful for build scripts to stop the execution immediately, here is an example:
```fsharp
cli {
Exec "dotnet"
Arguments [| "build"; "-c"; "Release" |]
WorkingDirectory "src/"
}
|> Command.execute // returns { Id = 123; Text = None; ExitCode = 1; Error = Some "This is an error!" }
|> Output.throwIfErrored // <- Exception thrown!
|> Output.toError
```
or, you can define when to "fail":
```fsharp
cli { ... }
|> Command.execute // returns { Id = 123; Text = "An error occured: ..."; ExitCode = 1; Error = Some "Error detail." }
|> Output.throw (fun output -> output.Text.Contains("error")) // <- Exception thrown!
|> Output.toError
```
#### Printing `Output` fields
There are printing methods in `Output` too:
```fsharp
printId: Output -> unit
printText: Output -> unit
printExitCode: Output -> unit
printError: Output -> unit
```
Instead of writing:
```fsharp
cli { ... }
|> Command.execute
|> Output.toText
|> printfn "%s"
```
For a little shorter code you can use:
```fsharp
cli { ... }
|> Command.execute
|> Output.printText
```
#### `Command.toString`
`Command.toString` concatenates only the executing shell/program + the given commands/arguments:
```fsharp
cli {
Shell PS
Command "Write-Host Hello World!"
}
|> Command.toString // "powershell.exe -Command Write-Host Hello World!"
```
and:
```fsharp
cli {
Exec "cmd.exe"
Arguments [ "/C"; "echo"; "Hello World!" ]
}
|> Command.toString // "cmd.exe /C echo Hello World!"
```
#### Builder operations:
`ShellContext` operations (`cli { Shell ... }`):
| Operation | Type |
|------------------------|----------------------------|
| `Shell` | `Fli.Shells` |
| `Command` | `string` |
| `Input` | `string` |
| `Output` | `Fli.Outputs` |
| `WorkingDirectory` | `string` |
| `WindowStyle` | `Fli.WindowStyle` |
| `EnvironmentVariable` | `string * string` |
| `EnvironmentVariables` | `(string * string) list` |
| `Encoding` | `System.Text.Encoding` |
| `CancelAfter` | `int` |
`ExecContext` operations (`cli { Exec ... }`):
| Operation | Type |
|------------------------|----------------------------------------------------------|
| `Exec` | `string` |
| `Arguments` | `string` / `string seq` / `string list` / `string array` |
| `Input` | `string` |
| `Output` | `Fli.Outputs` |
| `Verb` | `string` |
| `Username` | `string` |
| `Credentials` | `string * string * string` |
| `WorkingDirectory` | `string` |
| `WindowStyle` | `Fli.WindowStyle` |
| `EnvironmentVariable` | `string * string` |
| `EnvironmentVariables` | `(string * string) list` |
| `Encoding` | `System.Text.Encoding` |
| `CancelAfter` | `int` |
Currently provided `Fli.Shells`:
- `CMD` runs either `cmd.exe /c ...` or `cmd.exe /k ...` (if `Input` is provided)
- `PS` runs `powershell.exe -Command ...`
- `PWSH` runs `pwsh.exe -Command ...`
- `WSL` runs `wsl.exe -- ...`
- `SH` runs `sh -c ...`
- `BASH` runs `bash -c ...`
- `ZSH` runs `zsh -c ...`
- `CUSTOM (shell: string * flag: string)` runs the specified `shell` with the specified starting argument (`flag`)
Provided `Fli.Outputs`:
- `File of string` a string with an absolute path of the output file.
- `StringBuilder of StringBuilder` a StringBuilder which will be filled with the output text.
- `Custom of Func` a custom function (`string -> unit`) that will be called with the output string (logging, printing etc.).
Provided `Fli.WindowStyle`:
- `Hidden` (default)
- `Maximized`
- `Minimized`
- `Normal`
### Do you miss something?
Open an [issue](https://github.com/CaptnCodr/Fli/issues) or start a [discussion](https://github.com/CaptnCodr/Fli/discussions).
### Inspiration
Use CE's for CLI commands came in mind while using [FsHttp](https://github.com/fsprojects/FsHttp).