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//! Configuration file handling.
use crate::error::JournalError;
use crate::opt::Opt;
use directories_next::ProjectDirs;
use serde::Deserialize;
use std::default::Default;
use std::path::{Path, PathBuf};
const APP: &str = "jt2";
// The configuration file we read.
//
// Some of the fields are optional in the file. We will use default
// values for those, or get them command line options.
#[derive(Debug, Default, Deserialize)]
#[serde(deny_unknown_fields)]
struct InputConfiguration {
dirname: Option<PathBuf>,
editor: Option<String>,
}
impl InputConfiguration {
fn read(filename: &Path) -> Result<Self, JournalError> {
let text = std::fs::read(&filename)
.map_err(|err| JournalError::ReadConfig(filename.to_path_buf(), err))?;
let config = serde_yaml::from_slice(&text)
.map_err(|err| JournalError::ConfigSyntax(filename.to_path_buf(), err))?;
return Ok(config);
}
}
/// The run-time configuration.
///
/// This is the configuration as read from the configuration file, if
/// any, and with all command line options applied. Nothing here is
/// optional.
#[derive(Debug, Deserialize)]
pub struct Configuration {
/// The directory where the journal is stored.
pub dirname: PathBuf,
/// The editor to open for editing journal entry drafts.
pub editor: String,
}
impl Configuration {
/// Read configuration file.
///
/// The configuration is read from the file specified by the user
/// on the command line, or from a default location following the
/// XDG base directory specification. Note that only one of those
/// is read.
///
/// It's OK for the default configuration file to be missing, but
/// if one is specified by the user explicitly, that one MUST
/// exist.
pub fn read(opt: &Opt) -> Result<Self, JournalError> {
let proj_dirs =
ProjectDirs::from("", "", APP).expect("could not figure out home directory");
let filename = match &opt.global.config {
Some(path) => {
if !path.exists() {
return Err(JournalError::ConfigMissing(path.to_path_buf()));
}
path.to_path_buf()
}
None => proj_dirs.config_dir().to_path_buf().join("config.yaml"),
};
let input = if filename.exists() {
InputConfiguration::read(&filename)?
} else {
InputConfiguration::default()
};
Ok(Self {
dirname: if let Some(path) = &opt.global.dirname {
path.to_path_buf()
} else if let Some(path) = &input.dirname {
expand_tilde(path)
} else {
proj_dirs.data_dir().to_path_buf()
},
editor: if let Some(name) = &opt.global.editor {
name.to_string()
} else if let Some(name) = &input.editor {
name.to_string()
} else {
"/usr/bin/editor".to_string()
},
})
}
/// Write configuration to stdout.
pub fn dump(&self) {
println!("{:#?}", self);
}
}
fn expand_tilde(path: &Path) -> PathBuf {
if path.starts_with("~/") {
if let Some(home) = std::env::var_os("HOME") {
let mut expanded = PathBuf::from(home);
for comp in path.components().skip(1) {
expanded.push(comp);
}
expanded
} else {
path.to_path_buf()
}
} else {
path.to_path_buf()
}
}
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