feat: Add pager support

Cargo.toml

@@ -71,6 +71,7 @@ unicode-segmentation = "1.10.1"
 human-panic = "1.1.4"
 shadow-rs = { version = "0.21.0", optional = true }
 enum_dispatch = "0.3.11"
+minus = { version = "5.2.0", features = ["search", "dynamic_output"] }
 
 [dev-dependencies]
 test-case = "3.1.0"

src/bin/diffsitter.rs

@@ -7,14 +7,14 @@ use human_panic::setup_panic;
 use libdiffsitter::cli;
 use libdiffsitter::cli::Args;
 use libdiffsitter::config::{Config, ReadError};
-use libdiffsitter::console_utils;
-use libdiffsitter::diff;
 use libdiffsitter::generate_ast_vector_data;
 #[cfg(feature = "static-grammar-libs")]
 use libdiffsitter::parse::supported_languages;
 use libdiffsitter::parse::{generate_language, language_from_ext};
 use libdiffsitter::render::{DisplayData, DocumentDiffData, Renderer};
+use libdiffsitter::{console_utils, diff};
 use log::{debug, error, info, warn, LevelFilter};
+use minus::Pager;
 use serde_json as json;
 use std::{
     io,
@@ -150,11 +150,10 @@ fn run_diff(args: Args, config: Config) -> Result<()> {
     // the user just cares about the output at the end, we don't care about how frequently the
     // terminal does partial updates or anything like that. If the user is curious about progress,
     // they can enable logging and see when hunks are processed and written to the buffer.
-    let mut buf_writer = Term::buffered_stdout();
-    let term_info = buf_writer.clone();
-    renderer.render(&mut buf_writer, &params, Some(&term_info))?;
-    buf_writer.flush()?;
-    Ok(())
+    let mut pager = Pager::new();
+    // So we can write from another thread
+    let term_info = Term::stdout();
+    renderer.render(&mut pager, &params, Some(&term_info))
 }
 
 /// Serialize the default options struct to a json file and print that to stdout

src/render/json.rs

@@ -3,7 +3,7 @@ use crate::render::Renderer;
 use console::Term;
 use logging_timer::time;
 use serde::{Deserialize, Serialize};
-use std::io::Write;
+use std::fmt::Write;
 
 /// A renderer that outputs json data about the diff.
 ///

src/render/mod.rs

@@ -16,7 +16,7 @@ use console::{Color, Style, Term};
 use enum_dispatch::enum_dispatch;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
-use std::io::Write;
+use std::fmt::Write;
 use strum::{self, Display, EnumIter, EnumString};
 use unified::Unified;
 

src/render/unified.rs

@@ -6,7 +6,7 @@ use anyhow::Result;
 use console::{Color, Style, Term};
 use log::{debug, error, info};
 use serde::{Deserialize, Serialize};
-use std::{cmp::max, io::Write};
+use std::{cmp::max, fmt::Write};
 
 /// The ascii separator used after the diff title
 const TITLE_SEPARATOR: &str = "=";
@@ -167,7 +167,7 @@ impl Unified {
         old_fmt: &FormattingDirectives,
         new_fmt: &FormattingDirectives,
         term_info: Option<&Term>,
-    ) -> std::io::Result<()> {
+    ) -> std::fmt::Result {
         // The different ways we can stack the title
         #[derive(Debug, Eq, PartialEq, PartialOrd, Ord, strum_macros::Display)]
         #[strum(serialize_all = "snake_case")]