bendns' repos / helix
Unnamed repository; edit this file 'description' to name the repository.
lang-support.md
-rw-r--r--
6020
typable-cmd.md
-rw-r--r--
7197
f='#n44'>44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 
pub mod config;
pub mod grammar;

use etcetera::base_strategy::{choose_base_strategy, BaseStrategy};

pub static RUNTIME_DIR: once_cell::sync::Lazy<std::path::PathBuf> =
    once_cell::sync::Lazy::new(runtime_dir);

pub fn runtime_dir() -> std::path::PathBuf {
    if let Ok(dir) = std::env::var("HELIX_RUNTIME") {
        return dir.into();
    }

    const RT_DIR: &str = "runtime";
    let conf_dir = config_dir().join(RT_DIR);
    if conf_dir.exists() {
        return conf_dir;
    }

    if let Ok(dir) = std::env::var("CARGO_MANIFEST_DIR") {
        // this is the directory of the crate being run by cargo, we need the workspace path so we take the parent
        return std::path::PathBuf::from(dir).parent().unwrap().join(RT_DIR);
    }

    // fallback to location of the executable being run
    std::env::current_exe()
        .ok()
        .and_then(|path| path.parent().map(|path| path.to_path_buf().join(RT_DIR)))
        .unwrap()
}

pub fn config_dir() -> std::path::PathBuf {
    // TODO: allow env var override
    let strategy = choose_base_strategy().expect("Unable to find the config directory!");
    let mut path = strategy.config_dir();
    path.push("helix");
    path
}

pub fn local_config_dirs() -> Vec<std::path::PathBuf> {
    let directories = find_root_impl(None, &[".helix".to_string()])
        .into_iter()
        .map(|path| path.join(".helix"))
        .collect();
    log::debug!("Located configuration folders: {:?}", directories);
    directories
}

pub fn cache_dir() -> std::path::PathBuf {
    // TODO: allow env var override
    let strategy = choose_base_strategy().expect("Unable to find the config directory!");
    let mut path = strategy.cache_dir();
    path.push("helix");
    path
}

pub fn config_file() -> std::path::PathBuf {
    config_dir().join("config.toml")
}

pub fn lang_config_file() -> std::path::PathBuf {
    config_dir().join("languages.toml")
}

pub fn log_file() -> std::path::PathBuf {
    cache_dir().join("helix.log")
}

pub fn find_root_impl(root: Option<&str>, root_markers: &[String]) -> Vec<std::path::PathBuf> {
    let current_dir = std::env::current_dir().expect("unable to determine current directory");
    let mut directories = Vec::new();

    let root = match root {
        Some(root) => {
            let root = std::path::Path::new(root);
            if root.is_absolute() {
                root.to_path_buf()
            } else {
                current_dir.join(root)
            }
        }
        None => current_dir,
    };

    for ancestor in root.ancestors() {
        // don't go higher than repo
        if ancestor.join(".git").is_dir() {
            // Use workspace if detected from marker
            directories.push(ancestor.to_path_buf());
            break;
        } else if root_markers
            .iter()
            .any(|marker| ancestor.join(marker).exists())
        {
            directories.push(ancestor.to_path_buf());
        }
    }
    directories
}

/// Merge two TOML documents, merging values from `right` onto `left`
///
/// When an array exists in both `left` and `right`, `right`'s array is
/// used. When a table exists in both `left` and `right`, the merged table
/// consists of all keys in `left`'s table unioned with all keys in `right`
/// with the values of `right` being merged recursively onto values of
/// `left`.
///
/// `merge_toplevel_arrays` controls whether a top-level array in the TOML
/// document is merged instead of overridden. This is useful for TOML
/// documents that use a top-level array of values like the `languages.toml`,
/// where one usually wants to override or add to the array instead of
/// replacing it altogether.
pub fn merge_toml_values(
    left: toml::Value,
    right: toml::Value,
    merge_toplevel_arrays: bool,
) -> toml::Value {
    use toml::Value;

    fn get_name(v: &Value) -> Option<&str> {
        v.get("name").and_then(Value::as_str)
    }

    match (left, right) {
        (Value::Array(mut left_items), Value::Array(right_items)) => {
            // The top-level arrays should be merged but nested arrays should
            // act as overrides. For the `languages.toml` config, this means
            // that you can specify a sub-set of languages in an overriding
            // `languages.toml` but that nested arrays like Language Server
            // arguments are replaced instead of merged.
            if merge_toplevel_arrays {
                left_items.reserve(right_items.len());
                for rvalue in right_items {
                    let lvalue = get_name(&rvalue)
                        .and_then(|rname| {
                            left_items.iter().position(|v| get_name(v) == Some(rname))
                        })
                        .map(|lpos| left_items.remove(lpos));
                    let mvalue = match lvalue {
                        Some(lvalue) => merge_toml_values(lvalue, rvalue, false),
                        None => rvalue,
                    };
                    left_items.push(mvalue);
                }
                Value::Array(left_items)
            } else {
                Value::Array(right_items)
            }
        }
        (Value::Table(mut left_map), Value::Table(right_map)) => {
            for (rname, rvalue) in right_map {
                match left_map.remove(&rname) {
                    Some(lvalue) => {
                        let merged_value = merge_toml_values(lvalue, rvalue, merge_toplevel_arrays);
                        left_map.insert(rname, merged_value);
                    }
                    None => {
                        left_map.insert(rname, rvalue);
                    }
                }
            }
            Value::Table(left_map)
        }
        // Catch everything else we didn't handle, and use the right value
        (_, value) => value,
    }
}

#[cfg(test)]
mod merge_toml_tests {
    use super::merge_toml_values;
    use toml::Value;

    #[test]
    fn language_toml_map_merges() {
        const USER: &str = r#"
        [[language]]
        name = "nix"
        test = "bbb"
        indent = { tab-width = 4, unit = "    ", test = "aaa" }
        "#;

        let base: Value = toml::from_slice(include_bytes!("../../languages.toml"))
            .expect("Couldn't parse built-in languages config");
        let user: Value = toml::from_str(USER).unwrap();

        let merged = merge_toml_values(base, user, true);
        let languages = merged.get("language").unwrap().as_array().unwrap();
        let nix = languages
            .iter()
            .find(|v| v.get("name").unwrap().as_str().unwrap() == "nix")
            .unwrap();
        let nix_indent = nix.get("indent").unwrap();

        // We changed tab-width and unit in indent so check them if they are the new values
        assert_eq!(
            nix_indent.get("tab-width").unwrap().as_integer().unwrap(),
            4
        );
        assert_eq!(nix_indent.get("unit").unwrap().as_str().unwrap(), "    ");
        // We added a new keys, so check them
        assert_eq!(nix.get("test").unwrap().as_str().unwrap(), "bbb");
        assert_eq!(nix_indent.get("test").unwrap().as_str().unwrap(), "aaa");
        // We didn't change comment-token so it should be same
        assert_eq!(nix.get("comment-token").unwrap().as_str().unwrap(), "#");
    }

    #[test]
    fn language_toml_nested_array_merges() {
        const USER: &str = r#"
        [[language]]
        name = "typescript"
        language-server = { command = "deno", args = ["lsp"] }
        "#;

        let base: Value = toml::from_slice(include_bytes!("../../languages.toml"))
            .expect("Couldn't parse built-in languages config");
        let user: Value = toml::from_str(USER).unwrap();

        let merged = merge_toml_values(base, user, true);
        let languages = merged.get("language").unwrap().as_array().unwrap();
        let ts = languages
            .iter()
            .find(|v| v.get("name").unwrap().as_str().unwrap() == "typescript")
            .unwrap();
        assert_eq!(
            ts.get("language-server")
                .unwrap()
                .get("args")
                .unwrap()
                .as_array()
                .unwrap(),
            &vec![Value::String("lsp".into())]
        )
    }
}