feat: show error when no input file specified

Signed-off-by: Wenxuan Zhang <wenxuangm@gmail.com>
wfxr · Apr 3, 2024 · 1214c96 · 1214c96
1 parent 065bd76
commit 1214c96
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Showing 3 changed files with 90 additions and 44 deletions.
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -21,6 +21,7 @@ anyhow = "1.0"
 unicode-width = "0"
 unicode-truncate = "0"
 itertools = "0.12"
+atty = "0.2"
 
 [build-dependencies]
 clap = { version = "4", features = ["wrap_help", "derive"] }

diff --git a/src/main.rs b/src/main.rs
@@ -2,6 +2,7 @@ mod cli;
 mod table;
 mod util;
 
+use anyhow::bail;
 use clap::Parser;
 use cli::App;
 use csv::{ErrorKind, ReaderBuilder};
@@ -76,6 +77,7 @@ fn try_main() -> anyhow::Result<()> {
         .has_headers(!no_headers)
         .from_reader(match file {
             Some(path) => Box::new(File::open(path)?) as Box<dyn Read>,
+            None if atty::is(atty::Stream::Stdin) => bail!("no input file specified (use -h for help)"),
             None => Box::new(io::stdin()),
         });