delta-gitu 0.1.15

An experimental fork of gitu (a git client inspired by Magit), published as a library for delta to embed
Documentation 
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use crate::gitu_diff::FileDiff;

#[derive(Debug, Clone)]
pub(crate) struct Diff {
    pub text: String,
    pub diff_type: DiffType,
    pub file_diffs: Vec<FileDiff>,
    pub commit: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub(crate) enum DiffType {
    WorkdirToIndex, // i.e. Unstaged
    IndexToTree,    // i.e. Staged
    TreeToTree,
}

#[derive(Debug)]
pub(crate) enum PatchMode {
    Normal,
    Reverse,
}

impl Diff {
    pub(crate) fn format_file_patch(&self, file_i: usize) -> String {
        let mut patch = String::new();
        patch.push_str(self.file_diff_header(file_i));
        for hunk in &self.file_diffs[file_i].hunks {
            patch.push_str(&self.text[hunk.range.clone()]);
        }
        patch
    }

    pub(crate) fn format_hunk_patch(&self, file_i: usize, hunk_i: usize) -> String {
        let mut patch = String::new();
        patch.push_str(self.file_diff_header(file_i));
        patch.push_str(self.hunk(file_i, hunk_i));
        patch
    }

    pub(crate) fn file_diff_header(&self, file_i: usize) -> &str {
        &self.text[self.file_diffs[file_i].header.range.clone()]
    }

    pub(crate) fn hunk(&self, file_i: usize, hunk_i: usize) -> &str {
        &self.text[self.file_diffs[file_i].hunks[hunk_i].range.clone()]
    }

    pub(crate) fn hunk_content(&self, file_index: usize, hunk_index: usize) -> &str {
        &self.text[self.file_diffs[file_index].hunks[hunk_index]
            .content
            .range
            .clone()]
    }

    /// Build a patch that stages/reverses exactly the given content lines of a
    /// hunk. `line_indices` need not be contiguous: a side-by-side row that fuses
    /// an in-place change maps to a deletion and its (possibly non-adjacent)
    /// replacement, and both are staged together.
    pub(crate) fn format_lines_patch(
        &self,
        file_i: usize,
        hunk_i: usize,
        line_indices: &[usize],
        mode: PatchMode,
    ) -> String {
        let hunk = &self.file_diffs[file_i].hunks[hunk_i];
        let file_header = &self.text[self.file_diffs[file_i].header.range.clone()];
        let hunk_header = &self.text[hunk.header.range.clone()];
        let hunk_content = &self.text[hunk.content.range.clone()];

        let modified_content = hunk_content
            .split_inclusive('\n')
            .enumerate()
            .filter_map(|(i, line)| {
                let add = match mode {
                    PatchMode::Normal => '+',
                    PatchMode::Reverse => '-',
                };

                let remove = match mode {
                    PatchMode::Normal => '-',
                    PatchMode::Reverse => '+',
                };

                if line_indices.contains(&i) {
                    Some(line.to_string())
                } else if line.starts_with(add) {
                    None
                } else if let Some(stripped) = line.strip_prefix(remove) {
                    Some(format!(" {stripped}"))
                } else {
                    Some(line.to_string())
                }
            })
            .collect::<String>();

        format!("{file_header}{hunk_header}{modified_content}")
    }

    pub(crate) fn hunk_first_changed_line_num(&self, file_i: usize, hunk_i: usize) -> u32 {
        let new_line_start = self.file_diffs[file_i].hunks[hunk_i].header.new_line_start;
        let mut new_line = new_line_start;
        for line in self.hunk_content(file_i, hunk_i).lines() {
            if line.starts_with('+') {
                return new_line;
            }
            if !line.starts_with('-') {
                new_line += 1;
            }
        }
        new_line_start
    }

    pub(crate) fn hunk_line_new_file_num(
        &self,
        file_i: usize,
        hunk_i: usize,
        line_i: usize,
    ) -> u32 {
        let hunk = &self.file_diffs[file_i].hunks[hunk_i];
        let non_minus_before = self
            .hunk_content(file_i, hunk_i)
            .lines()
            .take(line_i)
            .filter(|l| l.starts_with(' ') || l.starts_with('+'))
            .count() as u32;
        hunk.header.new_line_start + non_minus_before
    }

    pub(crate) fn file_line_of_first_diff(&self, file_i: usize, hunk_i: usize) -> usize {
        let hunk = &self.file_diffs[file_i].hunks[hunk_i];
        let line = hunk.header.new_line_start as usize;

        let hunk_content = &self.text[hunk.content.range.clone()];
        for (i, content_line) in hunk_content.lines().enumerate() {
            if content_line.starts_with('+') || content_line.starts_with('-') {
                return line + i;
            }
        }
        line
    }
}