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Diffstat (limited to 'mingling/src/setups/stdin_args.rs')
| -rw-r--r-- | mingling/src/setups/stdin_args.rs | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/mingling/src/setups/stdin_args.rs b/mingling/src/setups/stdin_args.rs new file mode 100644 index 0000000..ca55ca7 --- /dev/null +++ b/mingling/src/setups/stdin_args.rs @@ -0,0 +1,82 @@ +use std::io::{IsTerminal, Read}; + +use mingling_core::{ + Program, ProgramCollect, hook::ProgramHook, setup::ProgramSetup, utils::ArgumentSplitter, +}; + +/// Uses the standard input as arguments for the program +/// +/// This Setup can take standard input supplied via a pipe or redirect, +/// split it according to whitespace and quoting rules, and append +/// the resulting arguments to the end of the command argument list. +/// +/// # Usage +/// +/// This Setup can be registered using the +/// [`Program`](https://docs.rs/mingling/latest/mingling/struct.Program.html) +/// `with_setup` method, for example: +/// +/// ```rust +/// # use mingling::MockProgramCollect as ThisProgram; +/// use mingling::Program; +/// use mingling::setup::StandardInputArgsSetup; +/// +/// let mut program = Program::<ThisProgram>::new(); +/// program.with_setup(StandardInputArgsSetup); +/// ``` +/// +/// # Behavior +/// +/// - Standard input is only read when it is not a terminal (i.e., when +/// there is piped or redirected input). +/// - The read content is split into multiple arguments according to +/// whitespace and quoting rules. +/// - If the standard input content is empty, no arguments are produced. +/// - All input is converted to UTF-8 encoding (lossy conversion is used +/// when strict parsing is not possible). +/// +/// # Notes +/// +/// - This Setup applies uniformly to all subcommands of the entire program +/// and does not provide fine-grained control. If you need different +/// standard input behavior across different subcommands (e.g., some +/// subcommands read stdin while others ignore it), **do not use this Setup**. +/// - This Setup does **not** provide any validation rules. Content provided +/// via standard input is treated as trusted arguments and appended directly. +/// As a result, the input source can also inject arbitrary arguments into +/// the command, so you should be careful when processing untrusted input. +pub struct StandardInputArgsSetup; + +impl<C> ProgramSetup<C> for StandardInputArgsSetup +where + C: ProgramCollect<Enum = C>, +{ + fn setup(self, program: &mut Program<C>) { + program.with_hook(ProgramHook::empty().on_pre_dispatch(|ctx| { + let pipe_input = read_stdin(); + if let Some(pipe_input) = pipe_input { + ctx.arguments.append(&mut pipe_input.trim().split_args()); + } + })); + } +} + +fn read_stdin() -> Option<String> { + // Check if stdin is a terminal (no piped input) or has data available + if std::io::stdin().is_terminal() { + return None; + } + + let mut bytes = Vec::new(); + match std::io::stdin().read_to_end(&mut bytes) { + Ok(_) => { + if bytes.is_empty() { + return None; + } + // Handle encoding differences, ensure output is always UTF-8. + // First try strict UTF-8 parsing; fall back to lossy conversion + Some(String::from_utf8_lossy(&bytes).into_owned()) + } + Err(_) => None, + } +} |
