in-process cat impl
_
parent
f4ce34e757
commit
979dffac17
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@ -8,9 +8,191 @@ version = "1.0.97"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "dcfed56ad506cb2c684a14971b8861fdc3baaaae314b9e5f9bb532cbe3ba7a4f"
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[[package]]
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name = "bitflags"
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version = "2.9.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5c8214115b7bf84099f1309324e63141d4c5d7cc26862f97a0a857dbefe165bd"
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[[package]]
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name = "cfg-if"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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[[package]]
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name = "errno"
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version = "0.3.10"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "33d852cb9b869c2a9b3df2f71a3074817f01e1844f839a144f5fcef059a4eb5d"
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dependencies = [
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"libc",
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"windows-sys",
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]
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[[package]]
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name = "fastrand"
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version = "2.3.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
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[[package]]
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name = "getrandom"
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version = "0.3.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "73fea8450eea4bac3940448fb7ae50d91f034f941199fcd9d909a5a07aa455f0"
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dependencies = [
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"cfg-if",
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"libc",
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"r-efi",
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"wasi",
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]
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[[package]]
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name = "libc"
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version = "0.2.171"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
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[[package]]
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name = "linux-raw-sys"
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version = "0.9.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fe7db12097d22ec582439daf8618b8fdd1a7bef6270e9af3b1ebcd30893cf413"
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[[package]]
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name = "look_at_that"
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version = "0.1.0"
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dependencies = [
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"anyhow",
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"tempfile",
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]
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[[package]]
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name = "once_cell"
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version = "1.21.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d75b0bedcc4fe52caa0e03d9f1151a323e4aa5e2d78ba3580400cd3c9e2bc4bc"
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[[package]]
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name = "r-efi"
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version = "5.2.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "74765f6d916ee2faa39bc8e68e4f3ed8949b48cccdac59983d287a7cb71ce9c5"
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[[package]]
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name = "rustix"
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version = "1.0.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e56a18552996ac8d29ecc3b190b4fdbb2d91ca4ec396de7bbffaf43f3d637e96"
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dependencies = [
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"bitflags",
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"errno",
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"libc",
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"linux-raw-sys",
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"windows-sys",
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]
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[[package]]
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name = "tempfile"
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version = "3.19.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7437ac7763b9b123ccf33c338a5cc1bac6f69b45a136c19bdd8a65e3916435bf"
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dependencies = [
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"fastrand",
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"getrandom",
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"once_cell",
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"rustix",
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"windows-sys",
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]
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[[package]]
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name = "wasi"
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version = "0.14.2+wasi-0.2.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9683f9a5a998d873c0d21fcbe3c083009670149a8fab228644b8bd36b2c48cb3"
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dependencies = [
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"wit-bindgen-rt",
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]
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[[package]]
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name = "windows-sys"
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version = "0.59.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
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dependencies = [
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"windows-targets",
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]
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[[package]]
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name = "windows-targets"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
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dependencies = [
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"windows_aarch64_gnullvm",
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"windows_aarch64_msvc",
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"windows_i686_gnu",
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"windows_i686_gnullvm",
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"windows_i686_msvc",
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"windows_x86_64_gnu",
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"windows_x86_64_gnullvm",
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"windows_x86_64_msvc",
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]
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[[package]]
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name = "windows_aarch64_gnullvm"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
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[[package]]
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name = "windows_aarch64_msvc"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
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[[package]]
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name = "windows_i686_gnu"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
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[[package]]
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name = "windows_i686_gnullvm"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
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[[package]]
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name = "windows_i686_msvc"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
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[[package]]
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name = "windows_x86_64_gnu"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
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[[package]]
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name = "windows_x86_64_gnullvm"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
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[[package]]
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name = "windows_x86_64_msvc"
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version = "0.52.6"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
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[[package]]
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name = "wit-bindgen-rt"
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version = "0.39.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6f42320e61fe2cfd34354ecb597f86f413484a798ba44a8ca1165c58d42da6c1"
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dependencies = [
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"bitflags",
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]
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@ -14,6 +14,9 @@ path = "src/main.rs"
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[dependencies]
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anyhow = { version = "1.0.97" }
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[dev-dependencies]
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tempfile = "3.19.1"
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[profile.release]
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codegen-units = 1
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lto = true
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63
src/main.rs
63
src/main.rs
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@ -1,20 +1,8 @@
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use anyhow::{Context as _, Result, bail};
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use std::{fs, io::{Read as _, Write as _}};
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fn main() -> Result<()> {
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use std::io::IsTerminal as _;
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let is_terminal = std::io::stdout().is_terminal();
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let mut args = std::env::args();
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let _exe_name = args.next().context("How do we not have an exe name?")?;
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let mut filenames = vec![];
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for arg in args {
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filenames.push(arg);
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}
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let app = App {
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filenames,
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is_terminal,
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};
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let app = App::try_new()?;
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app.run()
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}
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@ -24,12 +12,29 @@ struct App {
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}
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impl App {
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fn try_new() -> Result<Self> {
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use std::io::IsTerminal as _;
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let is_terminal = std::io::stdout().is_terminal();
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let mut args = std::env::args();
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let _exe_name = args.next().context("How do we not have an exe name?")?;
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let mut filenames = vec![];
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for arg in args {
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filenames.push(arg);
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}
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Ok(App {
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filenames,
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is_terminal,
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})
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}
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fn run(&self) -> Result<()> {
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if self.filenames.is_empty() {
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return self.ls(".");
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}
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for filename in &self.filenames {
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let metadata = std::fs::metadata(&filename)?;
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let metadata = fs::metadata(&filename)?;
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if metadata.is_dir() {
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self.ls(filename)?;
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} else {
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@ -40,13 +45,16 @@ impl App {
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}
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fn cat(&self, filename: &str) -> Result<()> {
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// Use `/usr/bin` just in case for some weird reason we're symlinked as cat,
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// we don't want to recurse into ourselves
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let status = std::process::Command::new("/usr/bin/cat").arg(filename).status()?;
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if !status.success() {
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bail!("subprocess `cat` failed");
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let mut f = fs::File::open(filename)?;
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let mut buf = vec![0u8; 4_096];
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loop {
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let bytes_read = f.read(&mut buf)?;
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let buf = &buf[0..bytes_read];
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if bytes_read == 0 {
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break Ok(());
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}
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std::io::stdout().write_all(buf)?;
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}
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Ok(())
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}
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fn ls(&self, filename: &str) -> Result<()> {
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@ -63,3 +71,16 @@ impl App {
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test() -> Result<()> {
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let dir = tempfile::tempdir()?;
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Ok(())
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}
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}
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Loading…
Reference in New Issue