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// nixos-config - My current NixOS configuration
//
// Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of my nixos-config.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
use std::path::{Path, PathBuf};
use anyhow::{Context, Result};
use clap::Parser;
use cli::{Args, Command};
use log::trace;
use mapping::map_key::MapKey;
use walkdir::{DirEntry, WalkDir};
use crate::mapping::MappingsTrie;
mod cli;
mod mapping;
fn main() -> anyhow::Result<()> {
let args = Args::parse();
stderrlog::new()
.module(module_path!())
.quiet(args.quiet)
.show_module_names(false)
.color(stderrlog::ColorChoice::Auto)
.verbosity(args.verbosity as usize)
.timestamp(stderrlog::Timestamp::Off)
.init()?;
let mut mappings = MappingsTrie::new();
let relevant_directories = match &args.command {
Command::Visualize { options } => &options.relevant_directories,
Command::Generate { options } => &options.relevant_directories,
Command::Interactive { options } => &options.relevant_directories,
};
for dir in relevant_directories {
trace!("START Processing '{}'..", dir.display());
let path = strip_path(dir, &args.home_name)?;
mappings
.include(path_to_str(path)?)
.with_context(|| format!("Failed to include path: '{}'", path.display()))?;
trace!("END Finished processing {}.", dir.display());
}
trace!("Generated mappings for the relevant directories. Starting expanding to max depth.");
if log::log_enabled!(log::Level::Trace) {
eprintln!("{mappings}");
}
let home = path_to_str(&args.home_name)?.to_owned();
let mut current_depth = 1;
while current_depth != args.depth {
for (keys, child) in mappings.0.iter().filter(|(_, child)| child.expendable) {
trace!("Adding to child '{}' ('{}')", MapKey::display(&keys), child);
let mut local_mappings = MappingsTrie::new();
for dir in WalkDir::new(extend(&home, &child.path)?)
.min_depth(1)
.max_depth(1)
.into_iter()
.filter_entry(|e| is_dir(e) && !is_hidden(e))
{
let directory = dir.with_context(|| {
format!("Failed to read dir ('{}')", home.clone() + &child.path)
})?;
let path_to_strip = &PathBuf::from(extend(&home, &child.path)?);
let path = strip_path(directory.path(), path_to_strip)?;
trace!(
"Including: '{}' (after stripping '{}' from '{}')",
path.display(),
path_to_strip.display(),
directory.path().display(),
);
let gen_key = MapKey::new_ones_from_path(path_to_str(path)?, 1);
local_mappings
.insert(
&gen_key,
path_to_str(strip_path(directory.path(), &PathBuf::from(&home))?)?,
)
.with_context(|| format!("Failed to include path: '{}'", path.display()))?;
}
mappings.add_trie(&keys, local_mappings)?;
}
current_depth += 1;
}
match args.command {
Command::Visualize { .. } => println!("{}", mappings.0),
Command::Generate { .. } => println!("{}", mappings.to_lf_mappings(args.home_name)),
Command::Interactive { .. } => mappings.interactive_start(args.home_name)?,
}
Ok(())
}
fn extend(base: &str, value: &str) -> Result<String> {
let base_path = PathBuf::from(base);
let value_path = PathBuf::from(value);
Ok(path_to_str(&base_path.join(&value_path))?.to_owned())
}
fn is_hidden(entry: &DirEntry) -> bool {
entry
.file_name()
.to_str()
.map(|s| s.starts_with("."))
.unwrap_or(false)
}
fn is_dir(entry: &DirEntry) -> bool {
entry.file_type().is_dir()
}
fn strip_path<'a>(path: &'a Path, to_strip: &Path) -> Result<&'a Path> {
path.strip_prefix(to_strip).with_context(|| {
format!(
"'{}' is not under the specified home path ('{}')!",
path.display(),
to_strip.display()
)
})
}
fn path_to_str(path: &Path) -> Result<&str> {
path.to_str().with_context(|| {
format!(
"\
Can't derive a keymapping from path: '{}' \
because it can't be turned to a string
",
path.display()
)
})
}
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