pub(super) mod function {    use anyhow::Context;    use std::{        collections::HashSet,        path::{Path, PathBuf},    };     use gix::{        bstr::{BString, ByteSlice},        objs::FindExt,    };     pub fn create_diff_cases(        dry_run: bool,        sliders_file: PathBuf,        worktree_dir: &Path,        destination_dir: PathBuf,        count: usize,        asset_dir: Option<BString>,    ) -> anyhow::Result<()> {        let prefix = if dry_run { "WOULD" } else { "Will" };        let sliders = std::fs::read_to_string(&sliders_file)?;         eprintln!(            "Read '{}' which has {} lines",            sliders_file.display(),            sliders.lines().count()        );         let sliders: HashSet<_> = sliders            .lines()            .take(count)            .map(|line| {                let parts: Vec<_> = line.split_ascii_whitespace().collect();                 match parts[..] {                    [before, after, ..] => (before, after),                    _ => unreachable!(),                }            })            .collect();         let repo = gix::open_opts(worktree_dir, gix::open::Options::isolated())?;         let asset_dir = asset_dir.unwrap_or("assets".into());        let assets = destination_dir.join(asset_dir.to_os_str()?);         eprintln!("{prefix} create directory '{assets}'", assets = assets.display());        if !dry_run {            std::fs::create_dir_all(&assets)?;        }         let mut buf = Vec::new();        let script_name = "make_diff_for_sliders_repo.sh";         let mut blocks: Vec<String> = vec![            r#"#!/usr/bin/env bashset -eu -o pipefail ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)" # Keep runtime assets fixed: slider::baseline reads assets/, while --asset-dir only locates source blobs.mkdir -p assets"#            .to_owned(),        ];         for (before, after) in sliders.iter().copied() {            let revspec = repo.rev_parse(before)?;            let old_blob_id = revspec                .single()                .context(format!("rev-spec '{before}' must resolve to a single object"))?;             let revspec = repo.rev_parse(after)?;            let new_blob_id = revspec                .single()                .context(format!("rev-spec '{after}' must resolve to a single object"))?;             let dst_old_blob = assets.join(format!("{old_blob_id}.blob"));            let dst_new_blob = assets.join(format!("{new_blob_id}.blob"));            if !dry_run {                let old_blob = repo.objects.find_blob(&old_blob_id, &mut buf)?.data;                std::fs::write(dst_old_blob, old_blob)?;                 let new_blob = repo.objects.find_blob(&new_blob_id, &mut buf)?.data;                std::fs::write(dst_new_blob, new_blob)?;            }             blocks.push(format!(                r#"git -c diff.algorithm=myers diff --no-index --no-ext-diff --no-color --indent-heuristic "$ROOT/{asset_dir}/{old_blob_id}.blob" "$ROOT/{asset_dir}/{new_blob_id}.blob" > {old_blob_id}-{new_blob_id}.myers.baseline || truegit -c diff.algorithm=myers diff --no-index --no-ext-diff --no-color --no-indent-heuristic "$ROOT/{asset_dir}/{old_blob_id}.blob" "$ROOT/{asset_dir}/{new_blob_id}.blob" > {old_blob_id}-{new_blob_id}.myers.no-indent.baseline || truegit -c diff.algorithm=histogram diff --no-index --no-ext-diff --no-color --indent-heuristic "$ROOT/{asset_dir}/{old_blob_id}.blob" "$ROOT/{asset_dir}/{new_blob_id}.blob" > {old_blob_id}-{new_blob_id}.histogram.baseline || truegit -c diff.algorithm=histogram diff --no-index --no-ext-diff --no-color --no-indent-heuristic "$ROOT/{asset_dir}/{old_blob_id}.blob" "$ROOT/{asset_dir}/{new_blob_id}.blob" > {old_blob_id}-{new_blob_id}.histogram.no-indent.baseline || truecp "$ROOT/{asset_dir}/{old_blob_id}.blob" assets/cp "$ROOT/{asset_dir}/{new_blob_id}.blob" assets/"#            ));        }         let script_file = destination_dir.join(script_name);        eprintln!(            "{prefix} write script file at '{script_file}'",            script_file = script_file.display()        );         if !dry_run {            let script = blocks.join("\n");            std::fs::write(script_file, script)?;        }         Ok(())    }}