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|
use anyhow::{Context, Result};
use crate::{
diff::ContentChange,
files::{FileState, Locations},
filesystem::Fs,
history::{FileChange, FileChangeVariant, FileHistory, RepositoryChange, RepositoryHistory},
};
use super::ActionOptions;
pub fn update(command_options: ActionOptions, fs: &impl Fs, timestamp: u64) -> Result<()> {
let locations = Locations::from(&command_options);
let repository_index_path = locations.get_repository_index_path();
let mut repository_index_file = fs.open_writable_file(&repository_index_path)?;
let mut repository_history = RepositoryHistory::from_file(fs, &mut repository_index_file)?;
let entries = locations
.get_repository_files(fs)
.context("Could not traverse files.")?;
let mut affected_files = Vec::new();
for state in entries {
let changed_file =
get_new_history_for_file(fs, repository_history.cursor, &state, &locations)?;
if let Some((mut history_file, new_file_history)) = changed_file {
new_file_history.write_to_file(fs, &mut history_file)?;
affected_files.push(state.get_working_path(&locations)?);
}
}
if !affected_files.is_empty() {
repository_history.add_change(RepositoryChange {
affected_files,
timestamp,
});
repository_history.cursor += 1;
repository_history.write_to_file(fs, &mut repository_index_file)?;
}
Ok(())
}
fn get_new_history_for_file<FS: Fs>(
fs: &FS,
cursor: usize,
file_state: &FileState,
locations: &Locations,
) -> Result<Option<(FS::File, FileHistory)>> {
match file_state {
FileState::Deleted(deleted) => {
let mut history_file = deleted.load_history_file(fs)?;
let file_history = FileHistory::from_file(fs, &mut history_file)?;
if !file_history.is_file_deleted(cursor) {
let mut new_history = file_history;
new_history.add_change(FileChange {
change_index: cursor + 1,
variant: FileChangeVariant::Deleted,
});
Ok(Some((history_file, new_history)))
} else {
Ok(None)
}
}
FileState::Untracked(untracked) => {
let mut file = untracked.load_file(fs)?;
let file_content = fs.read_from_file(&mut file)?;
let change = FileChange {
change_index: cursor + 1,
variant: FileChangeVariant::Updated(vec![ContentChange::Inserted {
at: 0,
new_content: file_content,
}]),
};
let mut new_history = FileHistory::default();
new_history.add_change(change);
Ok(Some((
untracked.create_history_file(fs, locations)?,
new_history,
)))
}
FileState::Tracked(tracked) => {
let mut history_file = tracked.load_history_file(fs)?;
let mut working_file = tracked.load_working_file(fs)?;
let file_history = FileHistory::from_file(fs, &mut history_file)?;
let new_content = fs.read_from_file(&mut working_file)?;
let old_content = file_history.get_content(cursor);
let changes = ContentChange::diff(&old_content, &new_content);
if !changes.is_empty() {
let mut new_history = file_history;
new_history.add_change(FileChange {
change_index: cursor + 1,
variant: FileChangeVariant::Updated(changes),
});
Ok(Some((history_file, new_history)))
} else {
Ok(None)
}
}
}
}
#[cfg(test)]
mod tests {
use std::path::Path;
use crate::{
actions::{create, update, ActionOptions},
diff::ContentChange,
filesystem::mock::{EntryMock, FsMock, FsState},
history::{
FileChange, FileChangeVariant, FileHistory, RepositoryChange, RepositoryHistory,
},
};
#[test]
fn no_update_if_no_change() {
let now = 0xC0FFEE;
let mut fs_mock = FsMock::new();
fs_mock.set_state(FsState::new(vec![EntryMock::file("./test", &[1, 2, 3])]));
// We create the initial Fs state by running the Create action.
create(ActionOptions::from_path("."), &fs_mock, now)
.expect("Creating expected state failed.");
let state = fs_mock.get_state();
update(ActionOptions::from_path("."), &fs_mock, now + 1).expect("Action failed.");
// No change should have happened.
fs_mock.assert_match(state);
}
#[test]
fn selective_update() {
let now = 0xC0FFEE;
let mut fs_mock = FsMock::new();
let options = ActionOptions::from_path(".");
let mut repo_history = RepositoryHistory::default();
repo_history.add_change(RepositoryChange {
affected_files: vec![
Path::new("./changed_file").into(),
Path::new("./unchanged_file").into(),
],
timestamp: now,
});
repo_history.cursor = 1;
let initial_index = repo_history.encode().unwrap();
repo_history.add_change(RepositoryChange {
affected_files: vec![Path::new("./changed_file").into()],
timestamp: now + 1,
});
repo_history.cursor = 2;
let updated_index = repo_history.encode().unwrap();
let mut file_history = FileHistory::default();
file_history.add_change(FileChange {
change_index: 1,
variant: FileChangeVariant::Updated(vec![ContentChange::Inserted {
at: 0,
new_content: vec![1, 2, 3],
}]),
});
let initial_file_history = file_history.encode().unwrap();
file_history.add_change(FileChange {
change_index: 2,
variant: FileChangeVariant::Updated(vec![ContentChange::Inserted {
at: 3,
new_content: vec![4, 5],
}]),
});
let updated_file_history = file_history.encode().unwrap();
fs_mock.set_state(FsState::new(vec![
EntryMock::file("./changed_file", &[1, 2, 3, 4, 5]),
EntryMock::file("./unchanged_file", &[1, 2, 3]),
EntryMock::dir("./.ka"),
EntryMock::file("./.ka/index", &initial_index),
EntryMock::dir("./.ka/files"),
EntryMock::file("./.ka/files/changed_file", &initial_file_history),
EntryMock::file("./.ka/files/unchanged_file", &initial_file_history),
]));
update(options, &fs_mock, now + 1).expect("Action failed.");
fs_mock.assert_match(FsState::new(vec![
EntryMock::file("./changed_file", &[1, 2, 3, 4, 5]),
EntryMock::file("./unchanged_file", &[1, 2, 3]),
EntryMock::dir("./.ka"),
EntryMock::file("./.ka/index", &updated_index),
EntryMock::dir("./.ka/files"),
EntryMock::file("./.ka/files/changed_file", &updated_file_history),
EntryMock::file("./.ka/files/unchanged_file", &initial_file_history),
]))
}
}
|
