lsv 0.1.15

Three‑pane terminal file viewer (TUI) with preview and Lua configuration
Documentation 
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use std::{
    fs,
    path::{
        Path,
        PathBuf,
    },
};

use mlua::{
    Error as LuaError,
    Lua,
    Table,
    Value,
};

use super::UiTheme;

pub(crate) fn merge_theme_table(
    theme_tbl: &Table,
    theme: &mut UiTheme,
)
{
    if let Ok(s) = theme_tbl.get::<String>("pane_bg")
    {
        theme.pane_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("border_fg")
    {
        theme.border_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("item_fg")
    {
        theme.item_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("item_bg")
    {
        theme.item_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("selected_item_fg")
    {
        theme.selected_item_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("selected_item_bg")
    {
        theme.selected_item_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("title_fg")
    {
        theme.title_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("title_bg")
    {
        theme.title_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("info_fg")
    {
        theme.info_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("dir_fg")
    {
        theme.dir_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("dir_bg")
    {
        theme.dir_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("file_fg")
    {
        theme.file_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("file_bg")
    {
        theme.file_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("hidden_fg")
    {
        theme.hidden_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("hidden_bg")
    {
        theme.hidden_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("exec_fg")
    {
        theme.exec_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("exec_bg")
    {
        theme.exec_bg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("selection_bar_fg")
    {
        theme.selection_bar_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("selection_bar_copy_fg")
    {
        theme.selection_bar_copy_fg = Some(s);
    }
    if let Ok(s) = theme_tbl.get::<String>("selection_bar_move_fg")
    {
        theme.selection_bar_move_fg = Some(s);
    }
}

pub(crate) fn resolve_theme_path(
    theme_path: &str,
    root: Option<&Path>,
) -> PathBuf
{
    let candidate = Path::new(theme_path);
    if candidate.is_absolute()
    {
        candidate.to_path_buf()
    }
    else if let Some(base) = root
    {
        base.join(candidate)
    }
    else
    {
        candidate.to_path_buf()
    }
}

pub(crate) fn load_theme_table_from_path(
    lua: &Lua,
    path: &Path,
) -> mlua::Result<Table>
{
    crate::trace::log(format!("[lua] read theme: {}", path.display()));
    let code = fs::read_to_string(path).map_err(|e| {
        LuaError::RuntimeError(format!(
            "read theme '{}' failed: {}",
            path.display(),
            e
        ))
    })?;
    crate::trace::log(format!("[lua] eval theme: {}", path.display()));
    let chunk = lua.load(&code).set_name(path.to_string_lossy());
    let value = match chunk.eval::<Value>()
    {
        Ok(v) => v,
        Err(e) =>
        {
            crate::trace::log(format!(
                "[lua] theme eval error ({}): {}",
                path.display(),
                e
            ));
            return Err(e);
        }
    };
    match value
    {
        Value::Table(t) => Ok(t),
        other => Err(LuaError::RuntimeError(format!(
            "theme '{}' returned {} (table expected)",
            path.display(),
            other.type_name()
        ))),
    }
}