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pub(super) mod info;
mod xdg;
use std::{
ffi::{OsStr, OsString},
io,
path::{Path, PathBuf},
};
use thiserror::Error;
use crate::DuctExpressionExt;
pub use crate::{
env::{Env, ExplicitEnv},
util::ln,
};
#[derive(Debug, Error)]
pub enum DetectEditorError {
#[error(
"No default editor is set: xdg-mime queries for \"text/rust\" and \"text/plain\" both failed"
)]
NoDefaultEditorSet,
#[error("Entry Not Found: xdg-mime returned an entry name that could not be found")]
FreeDesktopEntryNotFound,
#[error(
"Entry Parse Error: xdg-mime returned an entry that could not be parsed. Caused by {0}"
)]
FreeDesktopEntryParseError(io::Error),
#[error("Entry Parse Error: file lookup failed. Caused by {0}")]
FreeDesktopEntryLookupFailed(io::Error),
#[error("Exec field on desktop entry was not found")]
ExecFieldMissing,
}
#[derive(Debug, Error)]
pub enum OpenFileError {
#[error("Failed to run {command}: {error}")]
CommandFailed {
command: String,
error: std::io::Error,
},
#[error("Command parsing failed")]
CommandParsingFailed,
}
#[derive(Debug)]
pub struct Application {
exec_command: OsString,
icon: Option<OsString>,
xdg_entry_path: PathBuf,
}
impl Application {
pub fn detect_editor() -> Result<Self, DetectEditorError> {
// Try a rust code editor, then a plain text editor. If neither are available,
// then return an error.
let entry = xdg::query_mime_entry("text/rust")
.or_else(|| xdg::query_mime_entry("text/plain"))
.ok_or(DetectEditorError::NoDefaultEditorSet)?;
xdg::get_xdg_data_dirs()
.iter()
.find_map(|dir| {
let dir = dir.join("applications");
xdg::find_entry_in_dir(&dir, &entry)
// If finding an entry (a filename) in that directory, returns an error (such as
// if the directory is non existent, or the directory exists
// but for whatever reason listing its contents failed),
// we should skip it, as per the XDG Base Directory Specification v0.7 (latest
// as of today)
.ok()? // This returns None on error, continuing the search (skiping this dir)
.map(|entry_filepath| {
// If something was found, we have to try parsing it, which may fail as well
xdg::parse(&entry_filepath)
.map_err(DetectEditorError::FreeDesktopEntryParseError)
.and_then(|parsed_entry| {
Ok(Self {
// We absolutely want the Exec value
exec_command: parsed_entry
.section("Desktop Entry")
.attr("Exec")
.ok_or(DetectEditorError::ExecFieldMissing)?
.into(),
// The icon is optional, we try getting it because the Exec
// value may need it
icon: parsed_entry
.section("Desktop Entry")
.attr("Icon")
.map(Into::into),
xdg_entry_path: entry_filepath,
})
})
})
})
// If this returns None, no errors ocurred, and no elements were found
.unwrap_or(Err(DetectEditorError::FreeDesktopEntryNotFound))
}
pub fn open_file(&self, path: impl AsRef<Path>) -> Result<(), OpenFileError> {
let path = path.as_ref();
let maybe_icon = self.icon.as_deref();
// Parse the xdg command field with all the needed data
let command_parts = xdg::parse_command(
&self.exec_command,
path.as_os_str(),
maybe_icon,
Some(&self.xdg_entry_path),
);
if !command_parts.is_empty() {
// If command_parts has at least one element this works. If it has a single
// element, &command_parts[1..] should be an empty slice (&[]) and duct
// does not add any argument on that case
let cmd = duct::cmd(&command_parts[0], &command_parts[1..]);
cmd.run_and_detach()
.map_err(|error| OpenFileError::CommandFailed {
command: format!("{cmd:?}"),
error,
})
} else {
Err(OpenFileError::CommandParsingFailed)
}
}
}
pub fn open_file_with(
application: impl AsRef<OsStr>,
path: impl AsRef<OsStr>,
env: &Env,
) -> Result<(), OpenFileError> {
let app_str = application.as_ref();
let path_str = path.as_ref();
let command_parts = xdg::get_xdg_data_dirs()
.iter()
.find_map(|dir| {
let dir = dir.join("applications");
let (entry, entry_path) = xdg::find_entry_by_app_name(&dir, app_str)?;
let command_parts = entry
.section("Desktop Entry")
.attr("Exec")
.map(|str_entry| {
let osstring_entry: OsString = str_entry.into();
xdg::parse_command(
&osstring_entry,
path_str,
entry
.section("Desktop Entry")
.attr("Icon")
.map(|s| s.as_ref()),
Some(&entry_path),
)
})?;
// This could go outside, but we'd better have a proper error for it then
if !command_parts.is_empty() {
Some(command_parts) // This guarantees that command_parts has at least one element
} else {
None
}
})
// Here is why we ought to change this function's return type, to fit this error
.unwrap_or_else(|| vec![app_str.to_os_string()]);
// If command_parts has at least one element, this won't panic from Out of
// Bounds
let cmd = duct::cmd(&command_parts[0], &command_parts[1..]).vars(env.explicit_env());
cmd.run_and_detach()
.map_err(|error| OpenFileError::CommandFailed {
command: format!("{cmd:?}"),
error,
})
}
// We use "sh" in order to access "command -v", as that is a bultin command on
// sh. Linux does not require a binary "command" in path, so this seems the way
// to go.
#[cfg(target_os = "linux")]
pub fn command_path(name: &str) -> std::io::Result<std::process::Output> {
duct::cmd("sh", ["-c", format!("command -v {name}").as_str()]).run()
}
pub fn code_command() -> duct::Expression {
duct::cmd!("code")
}
pub fn replace_path_separator(path: OsString) -> OsString {
path
}
pub mod consts {
pub const CLANG: &str = "clang";
pub const CLANGXX: &str = "clang++";
pub const AR: &str = "ar";
pub const LD: &str = "ld";
pub const READELF: &str = "readelf";
pub const NDK_STACK: &str = "ndk-stack";
}