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mm(1): added -t for disabling truncation; mm.1: updated docs

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Emma Tebibyte 2024-07-13 23:56:30 -06:00
parent 1b3b03cae0
commit e972ff468a
Signed by untrusted user: emma
GPG Key ID: 06FA419A1698C270
2 changed files with 14 additions and 16 deletions
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16
docs/mm.1
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@ -10,7 +10,7 @@ mm \(en middleman
.SH SYNOPSIS
mm
.RB [ -aenu ]
.RB [ -aetu ]
.RB [ -i\ input ]
.RB [ -o\ output ]
.\"
@ -21,19 +21,19 @@ Catenate input files and write them to the start of each output file or stream.
.SH OPTIONS
.IP \fB-a\fP
Opens subsequent outputs for appending rather than updating.
Opens outputs for appending rather than updating.
.IP \fB-e\fP
Use the standard error as an output.
.IP \fB-t\fP
Causes outputs to be overwritten instead of being truncated.
.IP \fB-u\fP
Ensures neither input or output will be buffered.
.IP \fB-i\fP\ \fIinput\fP
Opens a path as an input. If one or more of the input files is \(lq-\(rq or if
no inputs are specified, the standard input shall be used.
.IP \fB-o\fP\ \fIoutput\fP
Opens a path as an output. If one or more of the output files is \(lq-\(rq or if
no outputs are specified, the standard output shall be used.
.IP \fB-u\fP
Ensures neither input or output will be buffered.
.IP \fB-n\fP
Causes SIGINT signals to be ignored.
.\"
.SH DIAGNOSTICS
@ -45,10 +45,6 @@ exits with the appropriate
.BR sysexits.h (3)
status.
.\"
.SH CAVEATS
Existing files are not truncated on ouput and are instead overwritten.
.\"
.SH RATIONALE
The

12
src/mm.rs
View File

@ -34,19 +34,21 @@ use sysexits::{ EX_IOERR, EX_USAGE };
fn main() -> ExitCode {
let argv = args().collect::<Vec<_>>();
let usage = format!("Usage: {} [-aeu] [-i input] [-o output]", argv[0]);
let usage = format!("Usage: {} [-aetu] [-i input] [-o output]", argv[0]);
let mut a = false; /* append rather than update */
let mut e = false; /* use stderr as an output */
let mut t = true;
let mut u = false; /* unbuffer i/o */
let mut ins = Vec::new(); /* initial inputs vector */
let mut outs = Vec::new(); /* initial outputs vector */
while let Some(opt) = argv.getopt("aei:o:u") {
while let Some(opt) = argv.getopt("aei:o:tu") {
match opt.opt() {
Ok("a") => a = true,
Ok("e") => e = true,
Ok("e") => e = true,
Ok("u") => u = true,
Ok("t") => t = false,
Ok("i") => { /* add input */
let input = opt.arg().unwrap();
ins.push(input);
@ -75,7 +77,7 @@ fn main() -> ExitCode {
return unsafe { File::from_raw_fd(stdin().as_raw_fd()) }; /* fd0 = stdin */
}
match File::options().append(a).open(file) {
match File::options().open(file) {
Ok(f) => f,
Err(e) => {
eprintln!("{}: {}", argv[0], e.strerror());
@ -91,7 +93,7 @@ fn main() -> ExitCode {
return unsafe { File::from_raw_fd(stdout().as_raw_fd()) }; /* fd1 = stdout */
}
match File::options().append(a).open(file) {
match File::options().truncate(t).append(a).open(file) {
Ok(f) => return f,
Err(e) => {
eprintln!("{}: {}", argv[0], e.strerror());