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//! Code for parsing default Mercurial config items.
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use itertools::Itertools;
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use serde::Deserialize;
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use crate::{errors::HgError, exit_codes, FastHashMap};
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/// Corresponds to the structure of `mercurial/configitems.toml`.
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#[derive(Debug, Deserialize)]
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pub struct ConfigItems {
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items: Vec<DefaultConfigItem>,
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templates: FastHashMap<String, Vec<TemplateItem>>,
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#[serde(rename = "template-applications")]
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template_applications: Vec<TemplateApplication>,
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}
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/// Corresponds to a config item declaration in `mercurial/configitems.toml`.
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#[derive(Clone, Debug, PartialEq, Deserialize)]
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#[serde(try_from = "RawDefaultConfigItem")]
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pub struct DefaultConfigItem {
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/// Section of the config the item is in (e.g. `[merge-tools]`)
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section: String,
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/// Name of the item (e.g. `meld.gui`)
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name: String,
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/// Default value (can be dynamic, see [`DefaultConfigItemType`])
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default: Option<DefaultConfigItemType>,
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/// If the config option is generic (e.g. `merge-tools.*`), defines
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/// the priority of this item relative to other generic items.
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/// If we're looking for <pattern>, then all generic items within the same
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/// section will be sorted by order of priority, and the first regex match
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/// against `name` is returned.
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#[serde(default)]
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priority: Option<isize>,
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/// Aliases, if any. Each alias is a tuple of `(section, name)` for each
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/// option that is aliased to this one.
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#[serde(default)]
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alias: Vec<(String, String)>,
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/// Whether the config item is marked as experimental
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#[serde(default)]
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experimental: bool,
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/// The (possibly empty) docstring for the item
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#[serde(default)]
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documentation: String,
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}
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/// Corresponds to the raw (i.e. on disk) structure of config items. Used as
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/// an intermediate step in deserialization.
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#[derive(Clone, Debug, Deserialize)]
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struct RawDefaultConfigItem {
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section: String,
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name: String,
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default: Option<toml::Value>,
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#[serde(rename = "default-type")]
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default_type: Option<String>,
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#[serde(default)]
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priority: isize,
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#[serde(default)]
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generic: bool,
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#[serde(default)]
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alias: Vec<(String, String)>,
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#[serde(default)]
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experimental: bool,
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#[serde(default)]
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documentation: String,
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}
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impl TryFrom<RawDefaultConfigItem> for DefaultConfigItem {
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type Error = HgError;
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fn try_from(value: RawDefaultConfigItem) -> Result<Self, Self::Error> {
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Ok(Self {
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section: value.section,
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name: value.name,
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default: raw_default_to_concrete(
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value.default_type,
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value.default,
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)?,
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priority: if value.generic {
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Some(value.priority)
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} else {
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None
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},
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alias: value.alias,
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experimental: value.experimental,
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documentation: value.documentation,
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})
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}
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}
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impl DefaultConfigItem {
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fn is_generic(&self) -> bool {
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self.priority.is_some()
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}
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}
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impl<'a> TryFrom<&'a DefaultConfigItem> for Option<&'a str> {
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type Error = HgError;
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fn try_from(
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value: &'a DefaultConfigItem,
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) -> Result<Option<&'a str>, Self::Error> {
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match &value.default {
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Some(default) => {
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let err = HgError::abort(
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format!(
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"programming error: wrong query on config item '{}.{}'",
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value.section,
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value.name
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),
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exit_codes::ABORT,
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Some(format!(
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"asked for '&str', type of default is '{}'",
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default.type_str()
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)),
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);
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match default {
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DefaultConfigItemType::Primitive(toml::Value::String(
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s,
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)) => Ok(Some(s)),
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_ => Err(err),
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}
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}
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None => Ok(None),
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}
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}
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}
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impl TryFrom<&DefaultConfigItem> for Option<bool> {
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type Error = HgError;
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fn try_from(value: &DefaultConfigItem) -> Result<Self, Self::Error> {
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match &value.default {
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Some(default) => {
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let err = HgError::abort(
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format!(
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"programming error: wrong query on config item '{}.{}'",
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value.section,
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value.name
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),
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exit_codes::ABORT,
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Some(format!(
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"asked for 'bool', type of default is '{}'",
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default.type_str()
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)),
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);
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match default {
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DefaultConfigItemType::Primitive(
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toml::Value::Boolean(b),
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) => Ok(Some(*b)),
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_ => Err(err),
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}
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}
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None => Ok(Some(false)),
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}
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}
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}
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impl TryFrom<&DefaultConfigItem> for Option<u32> {
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type Error = HgError;
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fn try_from(value: &DefaultConfigItem) -> Result<Self, Self::Error> {
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match &value.default {
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Some(default) => {
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let err = HgError::abort(
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format!(
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"programming error: wrong query on config item '{}.{}'",
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value.section,
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value.name
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),
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exit_codes::ABORT,
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Some(format!(
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"asked for 'u32', type of default is '{}'",
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default.type_str()
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)),
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);
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match default {
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DefaultConfigItemType::Primitive(
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toml::Value::Integer(b),
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) => {
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Ok(Some((*b).try_into().expect("TOML integer to u32")))
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}
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_ => Err(err),
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}
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}
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None => Ok(None),
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}
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}
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}
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impl TryFrom<&DefaultConfigItem> for Option<u64> {
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type Error = HgError;
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fn try_from(value: &DefaultConfigItem) -> Result<Self, Self::Error> {
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match &value.default {
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Some(default) => {
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let err = HgError::abort(
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format!(
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"programming error: wrong query on config item '{}.{}'",
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value.section,
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value.name
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),
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exit_codes::ABORT,
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Some(format!(
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"asked for 'u64', type of default is '{}'",
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default.type_str()
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)),
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);
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match default {
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DefaultConfigItemType::Primitive(
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toml::Value::Integer(b),
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) => {
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Ok(Some((*b).try_into().expect("TOML integer to u64")))
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}
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_ => Err(err),
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}
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}
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None => Ok(None),
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}
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}
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}
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/// Allows abstracting over more complex default values than just primitives.
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/// The former `configitems.py` contained some dynamic code that is encoded
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/// in this enum.
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#[derive(Debug, PartialEq, Clone, Deserialize)]
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pub enum DefaultConfigItemType {
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/// Some primitive type (string, integer, boolean)
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Primitive(toml::Value),
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/// A dynamic value that will be given by the code at runtime
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Dynamic,
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/// An lazily-returned array (possibly only relevant in the Python impl)
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/// Example: `lambda: [b"zstd", b"zlib"]`
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Lambda(Vec<String>),
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/// For now, a special case for `web.encoding` that points to the
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/// `encoding.encoding` module in the Python impl so that local encoding
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/// is correctly resolved at runtime
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LazyModule(String),
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ListType,
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}
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impl DefaultConfigItemType {
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pub fn type_str(&self) -> &str {
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match self {
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DefaultConfigItemType::Primitive(primitive) => {
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primitive.type_str()
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}
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DefaultConfigItemType::Dynamic => "dynamic",
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DefaultConfigItemType::Lambda(_) => "lambda",
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DefaultConfigItemType::LazyModule(_) => "lazy_module",
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DefaultConfigItemType::ListType => "list_type",
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}
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}
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}
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/// Most of the fields are shared with [`DefaultConfigItem`].
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#[derive(Debug, Clone, Deserialize)]
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#[serde(try_from = "RawTemplateItem")]
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struct TemplateItem {
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suffix: String,
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default: Option<DefaultConfigItemType>,
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priority: Option<isize>,
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#[serde(default)]
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alias: Vec<(String, String)>,
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#[serde(default)]
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experimental: bool,
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#[serde(default)]
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documentation: String,
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}
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/// Corresponds to the raw (i.e. on disk) representation of a template item.
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/// Used as an intermediate step in deserialization.
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#[derive(Clone, Debug, Deserialize)]
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struct RawTemplateItem {
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suffix: String,
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default: Option<toml::Value>,
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#[serde(rename = "default-type")]
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default_type: Option<String>,
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#[serde(default)]
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priority: isize,
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#[serde(default)]
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generic: bool,
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#[serde(default)]
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alias: Vec<(String, String)>,
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#[serde(default)]
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experimental: bool,
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#[serde(default)]
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documentation: String,
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}
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impl TemplateItem {
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fn into_default_item(
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self,
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application: TemplateApplication,
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) -> DefaultConfigItem {
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DefaultConfigItem {
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section: application.section,
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name: application
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.prefix
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.map(|prefix| format!("{}.{}", prefix, self.suffix))
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.unwrap_or(self.suffix),
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default: self.default,
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priority: self.priority,
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alias: self.alias,
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experimental: self.experimental,
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documentation: self.documentation,
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}
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}
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}
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impl TryFrom<RawTemplateItem> for TemplateItem {
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type Error = HgError;
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fn try_from(value: RawTemplateItem) -> Result<Self, Self::Error> {
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Ok(Self {
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suffix: value.suffix,
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default: raw_default_to_concrete(
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value.default_type,
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value.default,
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)?,
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priority: if value.generic {
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Some(value.priority)
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} else {
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None
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},
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alias: value.alias,
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experimental: value.experimental,
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documentation: value.documentation,
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})
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}
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}
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/// Transforms the on-disk string-based representation of complex default types
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/// to the concrete [`DefaultconfigItemType`].
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fn raw_default_to_concrete(
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default_type: Option<String>,
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default: Option<toml::Value>,
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) -> Result<Option<DefaultConfigItemType>, HgError> {
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Ok(match default_type.as_deref() {
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None => default.as_ref().map(|default| {
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DefaultConfigItemType::Primitive(default.to_owned())
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}),
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Some("dynamic") => Some(DefaultConfigItemType::Dynamic),
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Some("list_type") => Some(DefaultConfigItemType::ListType),
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Some("lambda") => match &default {
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Some(default) => Some(DefaultConfigItemType::Lambda(
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default.to_owned().try_into().map_err(|e| {
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HgError::abort(
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e.to_string(),
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exit_codes::ABORT,
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Some("Check 'mercurial/configitems.toml'".into()),
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)
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})?,
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)),
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None => {
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return Err(HgError::abort(
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"lambda defined with no return value".to_string(),
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exit_codes::ABORT,
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Some("Check 'mercurial/configitems.toml'".into()),
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))
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}
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},
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Some("lazy_module") => match &default {
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Some(default) => {
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Some(DefaultConfigItemType::LazyModule(match default {
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toml::Value::String(module) => module.to_owned(),
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_ => {
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return Err(HgError::abort(
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"lazy_module module name should be a string"
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.to_string(),
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exit_codes::ABORT,
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Some("Check 'mercurial/configitems.toml'".into()),
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))
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}
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}))
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}
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None => {
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return Err(HgError::abort(
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"lazy_module should have a default value".to_string(),
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exit_codes::ABORT,
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Some("Check 'mercurial/configitems.toml'".into()),
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))
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}
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},
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Some(invalid) => {
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return Err(HgError::abort(
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format!("invalid default_type '{}'", invalid),
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exit_codes::ABORT,
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Some("Check 'mercurial/configitems.toml'".into()),
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))
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}
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})
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}
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|
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#[derive(Debug, Clone, Deserialize)]
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struct TemplateApplication {
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template: String,
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section: String,
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#[serde(default)]
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prefix: Option<String>,
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}
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|
|
/// Represents the (dynamic) set of default core Mercurial config items from
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/// `mercurial/configitems.toml`.
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#[derive(Clone, Debug, Default)]
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pub struct DefaultConfig {
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/// Mapping of section -> (mapping of name -> item)
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items: FastHashMap<String, FastHashMap<String, DefaultConfigItem>>,
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}
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impl DefaultConfig {
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pub fn empty() -> DefaultConfig {
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Self {
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items: Default::default(),
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}
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}
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|
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/// Returns `Self`, given the contents of `mercurial/configitems.toml`
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#[logging_timer::time("trace")]
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pub fn from_contents(contents: &str) -> Result<Self, HgError> {
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let mut from_file: ConfigItems =
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toml::from_str(contents).map_err(|e| {
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HgError::abort(
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e.to_string(),
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exit_codes::ABORT,
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Some("Check 'mercurial/configitems.toml'".into()),
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)
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})?;
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let mut flat_items = from_file.items;
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for application in from_file.template_applications.drain(..) {
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match from_file.templates.get(&application.template) {
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None => return Err(
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|
HgError::abort(
|
|
|
format!(
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|
"template application refers to undefined template '{}'",
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|
application.template
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),
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exit_codes::ABORT,
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Some("Check 'mercurial/configitems.toml'".into())
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)
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),
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Some(template_items) => {
|
|
|
for template_item in template_items {
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|
flat_items.push(
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template_item
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|
|
.clone()
|
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|
.into_default_item(application.clone()),
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)
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|
}
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}
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};
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|
}
|
|
|
|
|
|
let items = flat_items.into_iter().fold(
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|
|
FastHashMap::default(),
|
|
|
|mut acc, item| {
|
|
|
acc.entry(item.section.to_owned())
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|
|
.or_insert_with(|| {
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|
|
let mut section = FastHashMap::default();
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|
section.insert(item.name.to_owned(), item.to_owned());
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|
|
section
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|
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})
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|
|
.insert(item.name.to_owned(), item);
|
|
|
acc
|
|
|
},
|
|
|
);
|
|
|
|
|
|
Ok(Self { items })
|
|
|
}
|
|
|
|
|
|
/// Return the default config item that matches `section` and `item`.
|
|
|
pub fn get(
|
|
|
&self,
|
|
|
section: &[u8],
|
|
|
item: &[u8],
|
|
|
) -> Option<&DefaultConfigItem> {
|
|
|
// Core items must be valid UTF-8
|
|
|
let section = String::from_utf8_lossy(section);
|
|
|
let section_map = self.items.get(section.as_ref())?;
|
|
|
let item_name_lossy = String::from_utf8_lossy(item);
|
|
|
match section_map.get(item_name_lossy.as_ref()) {
|
|
|
Some(item) => Some(item),
|
|
|
None => {
|
|
|
for generic_item in section_map
|
|
|
.values()
|
|
|
.filter(|item| item.is_generic())
|
|
|
.sorted_by_key(|item| match item.priority {
|
|
|
Some(priority) => (priority, &item.name),
|
|
|
_ => unreachable!(),
|
|
|
})
|
|
|
{
|
|
|
if regex::bytes::Regex::new(&generic_item.name)
|
|
|
.expect("invalid regex in configitems")
|
|
|
.is_match(item)
|
|
|
{
|
|
|
return Some(generic_item);
|
|
|
}
|
|
|
}
|
|
|
None
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
#[cfg(test)]
|
|
|
mod tests {
|
|
|
use crate::config::config_items::{
|
|
|
DefaultConfigItem, DefaultConfigItemType,
|
|
|
};
|
|
|
|
|
|
use super::DefaultConfig;
|
|
|
|
|
|
#[test]
|
|
|
fn test_config_read() {
|
|
|
let contents = r#"
|
|
|
[[items]]
|
|
|
section = "alias"
|
|
|
name = "abcd.*"
|
|
|
default = 3
|
|
|
generic = true
|
|
|
priority = -1
|
|
|
|
|
|
[[items]]
|
|
|
section = "alias"
|
|
|
name = ".*"
|
|
|
default-type = "dynamic"
|
|
|
generic = true
|
|
|
|
|
|
[[items]]
|
|
|
section = "cmdserver"
|
|
|
name = "track-log"
|
|
|
default-type = "lambda"
|
|
|
default = [ "chgserver", "cmdserver", "repocache",]
|
|
|
|
|
|
[[items]]
|
|
|
section = "chgserver"
|
|
|
name = "idletimeout"
|
|
|
default = 3600
|
|
|
|
|
|
[[items]]
|
|
|
section = "cmdserver"
|
|
|
name = "message-encodings"
|
|
|
default-type = "list_type"
|
|
|
|
|
|
[[items]]
|
|
|
section = "web"
|
|
|
name = "encoding"
|
|
|
default-type = "lazy_module"
|
|
|
default = "encoding.encoding"
|
|
|
|
|
|
[[items]]
|
|
|
section = "command-templates"
|
|
|
name = "graphnode"
|
|
|
alias = [["ui", "graphnodetemplate"]]
|
|
|
documentation = """This is a docstring.
|
|
|
This is another line \
|
|
|
but this is not."""
|
|
|
|
|
|
[[items]]
|
|
|
section = "censor"
|
|
|
name = "policy"
|
|
|
default = "abort"
|
|
|
experimental = true
|
|
|
|
|
|
[[template-applications]]
|
|
|
template = "diff-options"
|
|
|
section = "commands"
|
|
|
prefix = "revert.interactive"
|
|
|
|
|
|
[[template-applications]]
|
|
|
template = "diff-options"
|
|
|
section = "diff"
|
|
|
|
|
|
[templates]
|
|
|
[[templates.diff-options]]
|
|
|
suffix = "nodates"
|
|
|
default = false
|
|
|
|
|
|
[[templates.diff-options]]
|
|
|
suffix = "showfunc"
|
|
|
default = false
|
|
|
|
|
|
[[templates.diff-options]]
|
|
|
suffix = "unified"
|
|
|
"#;
|
|
|
let res = DefaultConfig::from_contents(contents);
|
|
|
let config = match res {
|
|
|
Ok(config) => config,
|
|
|
Err(e) => panic!("{}", e),
|
|
|
};
|
|
|
let expected = DefaultConfigItem {
|
|
|
section: "censor".into(),
|
|
|
name: "policy".into(),
|
|
|
default: Some(DefaultConfigItemType::Primitive("abort".into())),
|
|
|
priority: None,
|
|
|
alias: vec![],
|
|
|
experimental: true,
|
|
|
documentation: "".into(),
|
|
|
};
|
|
|
assert_eq!(config.get(b"censor", b"policy"), Some(&expected));
|
|
|
|
|
|
// Test generic priority. The `.*` pattern is wider than `abcd.*`, but
|
|
|
// `abcd.*` has priority, so it should match first.
|
|
|
let expected = DefaultConfigItem {
|
|
|
section: "alias".into(),
|
|
|
name: "abcd.*".into(),
|
|
|
default: Some(DefaultConfigItemType::Primitive(3.into())),
|
|
|
priority: Some(-1),
|
|
|
alias: vec![],
|
|
|
experimental: false,
|
|
|
documentation: "".into(),
|
|
|
};
|
|
|
assert_eq!(config.get(b"alias", b"abcdsomething"), Some(&expected));
|
|
|
|
|
|
//... but if it doesn't, we should fallback to `.*`
|
|
|
let expected = DefaultConfigItem {
|
|
|
section: "alias".into(),
|
|
|
name: ".*".into(),
|
|
|
default: Some(DefaultConfigItemType::Dynamic),
|
|
|
priority: Some(0),
|
|
|
alias: vec![],
|
|
|
experimental: false,
|
|
|
documentation: "".into(),
|
|
|
};
|
|
|
assert_eq!(config.get(b"alias", b"something"), Some(&expected));
|
|
|
|
|
|
let expected = DefaultConfigItem {
|
|
|
section: "chgserver".into(),
|
|
|
name: "idletimeout".into(),
|
|
|
default: Some(DefaultConfigItemType::Primitive(3600.into())),
|
|
|
priority: None,
|
|
|
alias: vec![],
|
|
|
experimental: false,
|
|
|
documentation: "".into(),
|
|
|
};
|
|
|
assert_eq!(config.get(b"chgserver", b"idletimeout"), Some(&expected));
|
|
|
|
|
|
let expected = DefaultConfigItem {
|
|
|
section: "cmdserver".into(),
|
|
|
name: "track-log".into(),
|
|
|
default: Some(DefaultConfigItemType::Lambda(vec![
|
|
|
"chgserver".into(),
|
|
|
"cmdserver".into(),
|
|
|
"repocache".into(),
|
|
|
])),
|
|
|
priority: None,
|
|
|
alias: vec![],
|
|
|
experimental: false,
|
|
|
documentation: "".into(),
|
|
|
};
|
|
|
assert_eq!(config.get(b"cmdserver", b"track-log"), Some(&expected));
|
|
|
|
|
|
let expected = DefaultConfigItem {
|
|
|
section: "command-templates".into(),
|
|
|
name: "graphnode".into(),
|
|
|
default: None,
|
|
|
priority: None,
|
|
|
alias: vec![("ui".into(), "graphnodetemplate".into())],
|
|
|
experimental: false,
|
|
|
documentation:
|
|
|
"This is a docstring.\nThis is another line but this is not."
|
|
|
.into(),
|
|
|
};
|
|
|
assert_eq!(
|
|
|
config.get(b"command-templates", b"graphnode"),
|
|
|
Some(&expected)
|
|
|
);
|
|
|
}
|
|
|
}
|
|
|
|
