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// PSPP - a program for statistical analysis.
// Copyright (C) 2025 Free Software Foundation, Inc.
//
// This program is free software: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
// details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <http://www.gnu.org/licenses/>.
use anyhow::{Result, anyhow};
use clap::{Args, ValueEnum};
use pspp::{
data::cases_to_output,
output::{
Details, Item, Text,
driver::{Config, Driver},
pivot::PivotTable,
},
pc::PcFile,
};
use serde::Serialize;
use std::{
cell::RefCell,
ffi::OsStr,
fmt::{Display, Write as _},
fs::File,
io::{BufReader, Write, stdout},
path::{Path, PathBuf},
rc::Rc,
sync::Arc,
};
/// Show information about SPSS/PC+ data files.
#[derive(Args, Clone, Debug)]
pub struct ShowPc {
/// What to show.
#[arg(value_enum)]
mode: Mode,
/// File to show.
#[arg(required = true)]
input: PathBuf,
/// Output file name. If omitted, output is written to stdout.
output: Option<PathBuf>,
/// Maximum number of cases to read.
///
/// If specified without an argument, all cases will be read.
#[arg(
long = "data",
num_args = 0..=1,
default_missing_value = "18446744073709551615",
default_value_t = 0,
help_heading = "Input file options"
)]
max_cases: usize,
/// Output driver configuration options.
#[arg(short = 'o', help_heading = "Output options")]
output_options: Vec<String>,
/// Output format.
#[arg(long, short = 'f', help_heading = "Output options")]
format: Option<ShowFormat>,
}
enum Output {
Driver {
driver: Rc<RefCell<Box<dyn Driver>>>,
mode: Mode,
},
Json {
writer: Rc<RefCell<Box<dyn Write>>>,
pretty: bool,
},
Discard,
}
impl Output {
fn show_json<T>(&self, value: &T) -> Result<()>
where
T: Serialize,
{
match self {
Self::Driver { mode, driver: _ } => {
Err(anyhow!("Mode '{mode}' only supports output as JSON."))
}
Self::Json { writer, pretty } => {
let mut writer = writer.borrow_mut();
match pretty {
true => serde_json::to_writer_pretty(&mut *writer, value)?,
false => serde_json::to_writer(&mut *writer, value)?,
};
writeln!(writer)?;
Ok(())
}
Self::Discard => Ok(()),
}
}
fn warn(&self, warning: &impl Display) {
match self {
Output::Driver { driver, .. } => {
driver
.borrow_mut()
.write(&Arc::new(Item::from(Text::new_log(warning.to_string()))));
}
Output::Json { .. } => {
#[derive(Serialize)]
struct Warning {
warning: String,
}
let warning = Warning {
warning: warning.to_string(),
};
let _ = self.show_json(&warning);
}
Self::Discard => (),
}
}
}
impl ShowPc {
pub fn run(self) -> Result<()> {
let format = if let Some(format) = self.format {
format
} else if let Some(output_file) = &self.output {
match output_file
.extension()
.unwrap_or(OsStr::new(""))
.to_str()
.unwrap_or("")
{
"json" => ShowFormat::Json,
"ndjson" => ShowFormat::Ndjson,
_ => ShowFormat::Output,
}
} else {
ShowFormat::Json
};
let output = match format {
ShowFormat::Output => {
let mut config = String::new();
if let Some(file) = &self.output {
#[derive(Serialize)]
struct File<'a> {
file: &'a Path,
}
let file = File {
file: file.as_path(),
};
let toml_file = toml::to_string_pretty(&file).unwrap();
config.push_str(&toml_file);
}
for option in &self.output_options {
writeln!(&mut config, "{option}").unwrap();
}
let table: toml::Table = toml::from_str(&config)?;
if !table.contains_key("driver") {
let driver = if let Some(file) = &self.output {
<dyn Driver>::driver_type_from_filename(file).ok_or_else(|| {
anyhow!("{}: no default output format for file name", file.display())
})?
} else {
"text"
};
#[derive(Serialize)]
struct DriverConfig {
driver: &'static str,
}
config.insert_str(
0,
&toml::to_string_pretty(&DriverConfig { driver }).unwrap(),
);
}
let config: Config = toml::from_str(&config)?;
Output::Driver {
mode: self.mode,
driver: Rc::new(RefCell::new(Box::new(<dyn Driver>::new(&config)?))),
}
}
ShowFormat::Json | ShowFormat::Ndjson => Output::Json {
pretty: format == ShowFormat::Json,
writer: if let Some(output_file) = &self.output {
Rc::new(RefCell::new(Box::new(File::create(output_file)?)))
} else {
Rc::new(RefCell::new(Box::new(stdout())))
},
},
ShowFormat::Discard => Output::Discard,
};
let reader = BufReader::new(File::open(&self.input)?);
match self.mode {
Mode::Dictionary => {
let PcFile {
dictionary,
metadata: _,
cases,
} = PcFile::open(reader, |warning| output.warn(&warning))?;
let cases = cases.take(self.max_cases);
match &output {
Output::Driver { driver, mode: _ } => {
let mut output = Vec::new();
output.extend(
dictionary
.all_pivot_tables()
.into_iter()
.map(|pivot_table| Item::new(pivot_table)),
);
output.extend(cases_to_output(&dictionary, cases));
driver
.borrow_mut()
.write(&Arc::new(Item::new(Details::Group(
output.into_iter().map(Arc::new).collect(),
))));
}
Output::Json { .. } => {
output.show_json(&dictionary)?;
for (_index, case) in (0..self.max_cases).zip(cases) {
output.show_json(&case?)?;
}
}
Output::Discard => (),
}
}
Mode::Metadata => {
let metadata = PcFile::open(reader, |warning| output.warn(&warning))?.metadata;
match &output {
Output::Driver { driver, mode: _ } => {
driver
.borrow_mut()
.write(&Arc::new(Item::new(PivotTable::from(&metadata))));
}
Output::Json { .. } => {
output.show_json(&metadata)?;
}
Output::Discard => (),
}
}
}
Ok(())
}
}
/// What to show in a system file.
#[derive(Clone, Copy, Debug, Default, PartialEq, ValueEnum)]
enum Mode {
/// File dictionary, with variables, value labels, ...
#[default]
#[value(alias = "dict")]
Dictionary,
/// File metadata not included in the dictionary.
Metadata,
}
impl Mode {
fn as_str(&self) -> &'static str {
match self {
Mode::Dictionary => "dictionary",
Mode::Metadata => "metadata",
}
}
}
impl Display for Mode {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.as_str())
}
}
#[derive(Clone, Copy, Debug, Default, PartialEq, Serialize, ValueEnum)]
#[serde(rename_all = "snake_case")]
enum ShowFormat {
/// Pretty-printed JSON.
#[default]
Json,
/// Newline-delimited JSON.
Ndjson,
/// Pivot tables.
Output,
/// No output.
Discard,
}