Add library crate

Cargo.toml

@@ -27,6 +27,7 @@ clap = { version = "4.2.7", features = ["derive", "deprecated", "wrap_help"] }
 [dev-dependencies]
 assert_cmd = "1.0.3"
 anyhow = "1.0.38"
+rstest = "0.17.0"
 
 [build-dependencies]
 clap = "4.2.7"

src/cli.rs

@@ -55,8 +55,13 @@ w - match full words only
     /// use captured values like $1, $2, etc.
     pub replace_with: String,
 
+    #[arg(long)]
+    /// Overwrite file instead of creating tmp file and swaping atomically
+    pub no_swap: bool,
+
     /// The path to file(s). This is optional - sd can also read from STDIN.
-    ///{n}{n}Note: sd modifies files in-place by default. See documentation for
+    /// 
+    /// Note: sd modifies files in-place by default. See documentation for
     /// examples.
     pub files: Vec<std::path::PathBuf>,
 }

src/input.rs

@@ -4,14 +4,31 @@ use crate::{Error, Replacer, Result};
 
 use is_terminal::IsTerminal;
 
+/// The source files we regard as the input.
 #[derive(Debug)]
-pub(crate) enum Source {
+pub enum Source {
     Stdin,
     Files(Vec<PathBuf>),
 }
 
 impl Source {
-    pub(crate) fn recursive() -> Result<Self> {
+    pub fn with_file<T>(file: T) -> Self
+        where T: Into<PathBuf>
+    {
+        Self::with_files(vec![file])
+    }
+
+    pub fn with_files<T>(files: Vec<T>) -> Self
+        where T: Into<PathBuf>
+    {
+        Self::Files(
+            files.into_iter()
+                .map(|file_path| file_path.into())
+                .collect()
+        )
+    }
+
+    pub fn recursive() -> Result<Self> {
         Ok(Self::Files(
             ignore::WalkBuilder::new(".")
                 .hidden(false)
@@ -36,6 +53,7 @@ impl App {
     pub(crate) fn new(source: Source, replacer: Replacer) -> Self {
         Self { source, replacer }
     }
+
     pub(crate) fn run(&self, preview: bool) -> Result<()> {
         let is_tty = std::io::stdout().is_terminal();
 

src/lib.rs

@@ -0,0 +1,55 @@
+pub mod input;
+pub mod error;
+pub mod replacer;
+pub mod utils;
+
+pub use self::input::Source;
+pub use error::{Error, Result};
+use input::App;
+pub(crate) use replacer::Replacer;
+
+pub struct ReplaceConf {
+    pub source: Source,
+    pub preview: bool,
+    pub no_swap: bool,
+    pub literal_mode: bool,
+    pub flags: Option<String>,
+    pub replacements: Option<usize>,
+}
+
+impl Default for ReplaceConf {
+    fn default() -> Self {
+        Self {
+            source: Source::Stdin,
+            preview: false,
+            no_swap: false,
+            literal_mode: false,
+            flags: None,
+            replacements: None,
+        }
+    }
+}
+
+/// For example:
+/// 
+/// ```no_run
+/// replace("foo", "bar", ReplaceConf {
+///     source: Source::with_files(vec!["./foo.md", "./bar.md", "./foobar.md"]),
+///     ..ReplaceConf::default()
+/// })
+/// ```
+pub fn replace(find: String, replace_with: String, replace_conf: ReplaceConf) -> Result<()> {
+    App::new(
+        replace_conf.source,
+        Replacer::new(
+            find,
+            replace_with,
+            replace_conf.literal_mode,
+            replace_conf.flags,
+            replace_conf.replacements,
+            replace_conf.no_swap,
+        )?,
+    )
+    .run(replace_conf.preview)?;
+    Ok(())
+}

src/main.rs

@@ -1,16 +1,9 @@
 mod cli;
-mod error;
-mod input;
-
-pub(crate) mod replacer;
-pub(crate) mod utils;
-
-pub(crate) use self::input::{App, Source};
-pub(crate) use error::{Error, Result};
-use replacer::Replacer;
 
 use clap::Parser;
 
+use sd::{Result, Source, replace, ReplaceConf};
+
 fn main() -> Result<()> {
     let options = cli::Options::parse();
 
@@ -22,16 +15,13 @@ fn main() -> Result<()> {
         Source::Stdin
     };
 
-    App::new(
+    replace(options.find, options.replace_with, ReplaceConf {
         source,
-        Replacer::new(
-            options.find,
-            options.replace_with,
-            options.literal_mode,
-            options.flags,
-            options.replacements,
-        )?,
-    )
-    .run(options.preview)?;
+        preview: options.preview,
+        no_swap: options.no_swap,
+        literal_mode: options.literal_mode,
+        flags: options.flags,
+        replacements: options.replacements,
+    })?;
     Ok(())
 }

src/replacer.rs

@@ -1,12 +1,18 @@
 use crate::{utils, Error, Result};
 use regex::bytes::Regex;
-use std::{fs, fs::File, io::prelude::*, path::Path};
+use std::{
+    fs,
+    fs::{File, OpenOptions},
+    io::{prelude::*, SeekFrom},
+    path::Path,
+};
 
 pub(crate) struct Replacer {
     regex: Regex,
     replace_with: Vec<u8>,
     is_literal: bool,
     replacements: usize,
+    no_swap: bool,
 }
 
 impl Replacer {
@@ -16,6 +22,7 @@ impl Replacer {
         is_literal: bool,
         flags: Option<String>,
         replacements: Option<usize>,
+        no_swap: bool,
     ) -> Result<Self> {
         let (look_for, replace_with) = if is_literal {
             (regex::escape(&look_for), replace_with.into_bytes())
@@ -61,6 +68,7 @@ impl Replacer {
             replace_with,
             is_literal,
             replacements: replacements.unwrap_or(0),
+            no_swap,
         })
     }
 
@@ -128,29 +136,42 @@ impl Replacer {
             return Ok(());
         }
 
-        let source = File::open(path)?;
-        let meta = fs::metadata(path)?;
-        let mmap_source = unsafe { Mmap::map(&source)? };
-        let replaced = self.replace(&mmap_source);
-
-        let target = tempfile::NamedTempFile::new_in(
-            path.parent()
-                .ok_or_else(|| Error::InvalidPath(path.to_path_buf()))?,
-        )?;
-        let file = target.as_file();
-        file.set_len(replaced.len() as u64)?;
-        file.set_permissions(meta.permissions())?;
-
-        if !replaced.is_empty() {
-            let mut mmap_target = unsafe { MmapMut::map_mut(file)? };
-            mmap_target.deref_mut().write_all(&replaced)?;
-            mmap_target.flush_async()?;
-        }
+        if self.no_swap {
+            let mut source =
+                OpenOptions::new().read(true).write(true).open(path)?;
+            let mut buffer = Vec::new();
+            source.read_to_end(&mut buffer)?;
+
+            let replaced = self.replace(&buffer);
+
+            source.seek(SeekFrom::Start(0))?;
+            source.write_all(&replaced)?;
+            source.set_len(replaced.len() as u64)?;
+        } else {
+            let source = File::open(path)?;
+            let meta = fs::metadata(path)?;
+            let mmap_source = unsafe { Mmap::map(&source)? };
+            let replaced = self.replace(&mmap_source);
+
+            let target = tempfile::NamedTempFile::new_in(
+                path.parent()
+                    .ok_or_else(|| Error::InvalidPath(path.to_path_buf()))?,
+            )?;
+            let file = target.as_file();
+            file.set_len(replaced.len() as u64)?;
+            file.set_permissions(meta.permissions())?;
+
+            if !replaced.is_empty() {
+                let mut mmap_target = unsafe { MmapMut::map_mut(file)? };
+                mmap_target.deref_mut().write_all(&replaced)?;
+                mmap_target.flush_async()?;
+            }
 
-        drop(mmap_source);
-        drop(source);
+            drop(mmap_source);
+            drop(source);
+            target.persist(fs::canonicalize(path)?)?;
+        }
 
-        target.persist(fs::canonicalize(path)?)?;
         Ok(())
     }
 }
@@ -173,6 +194,7 @@ mod tests {
             literal,
             flags.map(ToOwned::to_owned),
             None,
+            false,
         )
         .unwrap();
         assert_eq!(