settings: pass around &UserSettings instead of &config::Config consistently

Ui::with_config() is unchanged because I'm not sure if UserSettings should be
constructed earlier. I assume UserSettings will hold an immutable copy of
LayerdConfigs object, whereas Ui has to be initialized before all config layers
get loaded.

cli/src/cli_util.rs

@@ -658,10 +658,10 @@ struct AdvanceBookmarksSettings {
 }
 
 impl AdvanceBookmarksSettings {
-    fn from_config(config: &config::Config) -> Result<Self, CommandError> {
+    fn from_settings(settings: &UserSettings) -> Result<Self, CommandError> {
         let get_setting = |setting_key| {
             let setting = format!("experimental-advance-branches.{setting_key}");
-            match config.get::<Vec<String>>(&setting).optional()? {
+            match settings.config().get::<Vec<String>>(&setting).optional()? {
                 Some(patterns) => patterns
                     .into_iter()
                     .map(|s| {
@@ -2180,7 +2180,7 @@ Then run `jj squash` to move the resolution into the conflicted commit."#,
         &self,
         from: impl IntoIterator<Item = &'a CommitId>,
     ) -> Result<Vec<AdvanceableBookmark>, CommandError> {
-        let ab_settings = AdvanceBookmarksSettings::from_config(self.settings().config())?;
+        let ab_settings = AdvanceBookmarksSettings::from_settings(self.settings())?;
         if !ab_settings.feature_enabled() {
             // Return early if we know that there's no work to do.
             return Ok(Vec::new());

cli/src/commands/fix.rs

@@ -38,6 +38,7 @@ use jj_lib::repo_path::RepoPathBuf;
 use jj_lib::repo_path::RepoPathUiConverter;
 use jj_lib::revset::RevsetExpression;
 use jj_lib::revset::RevsetIteratorExt;
+use jj_lib::settings::UserSettings;
 use jj_lib::store::Store;
 use jj_lib::tree::Tree;
 use pollster::FutureExt;
@@ -144,7 +145,7 @@ pub(crate) fn cmd_fix(
     args: &FixArgs,
 ) -> Result<(), CommandError> {
     let mut workspace_command = command.workspace_helper(ui)?;
-    let tools_config = get_tools_config(ui, command.settings().config())?;
+    let tools_config = get_tools_config(ui, command.settings())?;
     let root_commits: Vec<CommitId> = if args.source.is_empty() {
         let revs = command.settings().config().get_string("revsets.fix")?;
         workspace_command.parse_revset(ui, &RevisionArg::from(revs))?
@@ -445,7 +446,8 @@ struct RawToolConfig {
 /// Fails if any of the commands or patterns are obviously unusable, but does
 /// not check for issues that might still occur later like missing executables.
 /// This is a place where we could fail earlier in some cases, though.
-fn get_tools_config(ui: &mut Ui, config: &config::Config) -> Result<ToolsConfig, CommandError> {
+fn get_tools_config(ui: &mut Ui, settings: &UserSettings) -> Result<ToolsConfig, CommandError> {
+    let config = settings.config();
     let mut tools_config = ToolsConfig { tools: Vec::new() };
     // TODO: Remove this block of code and associated documentation after at least
     // one release where the feature is marked deprecated.

lib/src/fsmonitor.rs

@@ -24,10 +24,9 @@
 
 use std::path::PathBuf;
 
-use config::Config;
-
 use crate::config::ConfigError;
 use crate::settings::ConfigResultExt;
+use crate::settings::UserSettings;
 
 /// Config for Watchman filesystem monitor (<https://facebook.github.io/watchman/>).
 #[derive(Default, Eq, PartialEq, Clone, Debug)]
@@ -59,11 +58,12 @@ pub enum FsmonitorSettings {
 
 impl FsmonitorSettings {
     /// Creates an `FsmonitorSettings` from a `config`.
-    pub fn from_config(config: &Config) -> Result<FsmonitorSettings, ConfigError> {
-        match config.get_string("core.fsmonitor") {
+    pub fn from_settings(settings: &UserSettings) -> Result<FsmonitorSettings, ConfigError> {
+        match settings.config().get_string("core.fsmonitor") {
             Ok(s) => match s.as_str() {
                 "watchman" => Ok(Self::Watchman(WatchmanConfig {
-                    register_trigger: config
+                    register_trigger: settings
+                        .config()
                         .get_bool("core.watchman.register_snapshot_trigger")
                         .optional()?
                         .unwrap_or_default(),

lib/src/settings.rs

@@ -50,12 +50,14 @@ pub struct GitSettings {
 }
 
 impl GitSettings {
-    pub fn from_config(config: &config::Config) -> Self {
-        let auto_local_bookmark = config
+    pub fn from_settings(settings: &UserSettings) -> Self {
+        let auto_local_bookmark = settings
+            .config()
             .get_bool("git.auto-local-bookmark")
-            .or_else(|_| config.get_bool("git.auto-local-branch"))
+            .or_else(|_| settings.config().get_bool("git.auto-local-branch"))
             .unwrap_or(false);
-        let abandon_unreachable_commits = config
+        let abandon_unreachable_commits = settings
+            .config()
             .get_bool("git.abandon-unreachable-commits")
             .unwrap_or(true);
         GitSettings {
@@ -169,7 +171,7 @@ impl UserSettings {
     }
 
     pub fn fsmonitor_settings(&self) -> Result<FsmonitorSettings, ConfigError> {
-        FsmonitorSettings::from_config(&self.config)
+        FsmonitorSettings::from_settings(self)
     }
 
     // Must not be changed to avoid git pushing older commits with no set email
@@ -236,7 +238,7 @@ impl UserSettings {
     }
 
     pub fn git_settings(&self) -> GitSettings {
-        GitSettings::from_config(&self.config)
+        GitSettings::from_settings(self)
     }
 
     pub fn max_new_file_size(&self) -> Result<u64, ConfigError> {