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|
use std::collections::HashMap;
use structopt::clap;
use crate::cli;
use crate::config;
use crate::git_config::{self, GitConfigGet};
use crate::preset::{self, GetValueFunctionFromBuiltinPreset};
// A type T implementing this trait gains a static method allowing an option value of type T to be
// looked up, implementing delta's rules for looking up option values.
trait GetOptionValue {
// If the value for option name n was not supplied on the command line, then a search is performed
// as follows. The first value encountered is used:
//
// 1. For each preset p (moving right to left through the listed presets):
// 1.1 The value of n under p interpreted as a user-supplied preset (i.e. git config value
// delta.$p.$n)
// 1.2 The value for n under p interpreted as a builtin preset
// 3. The value for n in the main git config section for delta (i.e. git config value delta.$n)
fn get_option_value(
option_name: &str,
builtin_presets: &HashMap<String, preset::BuiltinPreset<String>>,
opt: &cli::Opt,
git_config: &mut Option<git_config::GitConfig>,
) -> Option<Self>
where
Self: Sized,
Self: GitConfigGet,
Self: GetValueFunctionFromBuiltinPreset,
{
if let Some(presets) = &opt.presets {
for preset in presets.to_lowercase().split_whitespace().rev() {
if let Some(value) = Self::get_option_value_for_preset(
option_name,
&preset,
&builtin_presets,
opt,
git_config,
) {
return Some(value);
}
}
}
if let Some(git_config) = git_config {
if let Some(value) = git_config.get::<Self>(&format!("delta.{}", option_name)) {
return Some(value);
}
}
None
}
fn get_option_value_for_preset(
option_name: &str,
preset: &str,
builtin_presets: &HashMap<String, preset::BuiltinPreset<String>>,
opt: &cli::Opt,
git_config: &mut Option<git_config::GitConfig>,
) -> Option<Self>
where
Self: Sized,
Self: GitConfigGet,
Self: GetValueFunctionFromBuiltinPreset,
{
if let Some(git_config) = git_config {
if let Some(value) =
git_config.get::<Self>(&format!("delta.{}.{}", preset, option_name))
{
return Some(value);
}
}
if let Some(builtin_preset) = builtin_presets.get(preset) {
if let Some(value_function) =
Self::get_value_function_from_builtin_preset(option_name, builtin_preset)
{
return Some(value_function(opt, &git_config));
}
}
return None;
}
}
impl GetOptionValue for String {}
impl GetOptionValue for Option<String> {
fn get_option_value(
option_name: &str,
builtin_presets: &HashMap<String, preset::BuiltinPreset<String>>,
opt: &cli::Opt,
git_config: &mut Option<git_config::GitConfig>,
) -> Option<Self> {
match get_option_value::<String>(option_name, builtin_presets, opt, git_config) {
Some(value) => Some(Some(value)),
None => None,
}
}
}
impl GetOptionValue for bool {}
impl GetOptionValue for i64 {}
impl GetOptionValue for usize {
fn get_option_value(
option_name: &str,
builtin_presets: &HashMap<String, preset::BuiltinPreset<String>>,
opt: &cli::Opt,
git_config: &mut Option<git_config::GitConfig>,
) -> Option<Self> {
match get_option_value::<i64>(option_name, builtin_presets, opt, git_config) {
Some(value) => Some(value as usize),
None => None,
}
}
}
impl GetOptionValue for f64 {
fn get_option_value(
option_name: &str,
builtin_presets: &HashMap<String, preset::BuiltinPreset<String>>,
opt: &cli::Opt,
git_config: &mut Option<git_config::GitConfig>,
) -> Option<Self> {
match get_option_value::<String>(option_name, builtin_presets, opt, git_config) {
Some(value) => value.parse::<f64>().ok(),
None => None,
}
}
}
fn get_option_value<T>(
option_name: &str,
builtin_presets: &HashMap<String, preset::BuiltinPreset<String>>,
opt: &cli::Opt,
git_config: &mut Option<git_config::GitConfig>,
) -> Option<T>
where
T: GitConfigGet,
T: GetOptionValue,
T: GetValueFunctionFromBuiltinPreset,
{
T::get_option_value(option_name, builtin_presets, opt, git_config)
}
macro_rules! set_options {
([$( ($option_name:expr, $type:ty, $field_ident:ident) ),* ],
$opt:expr, $builtin_presets:expr, $git_config:expr, $arg_matches:expr) => {
$(
if !$crate::config::user_supplied_option($option_name, $arg_matches) {
if let Some(value) = get_option_value::<$type>($option_name, &$builtin_presets, $opt, $git_config) {
$opt.$field_ident = value;
}
};
)*
};
}
pub fn set_options(
opt: &mut cli::Opt,
git_config: &mut Option<git_config::GitConfig>,
arg_matches: &clap::ArgMatches,
) {
if opt.no_gitconfig {
return;
}
// Handle options which default to an arbitrary git config value.
// TODO: incorporate this logic into the set_options macro.
if !config::user_supplied_option("whitespace-error-style", arg_matches) {
opt.whitespace_error_style = if let Some(git_config) = git_config {
git_config.get::<String>("color.diff.whitespace")
} else {
None
}
.unwrap_or_else(|| "magenta reverse".to_string())
}
set_options!(
[
// --presets must be set first
("presets", Option<String>, presets),
("color-only", bool, color_only),
("commit-decoration-style", String, commit_decoration_style),
("commit-style", String, commit_style),
("dark", bool, dark),
("file-added-label", String, file_added_label),
("file-decoration-style", String, file_decoration_style),
("file-modified-label", String, file_modified_label),
("file-removed-label", String, file_removed_label),
("file-renamed-label", String, file_renamed_label),
("file-style", String, file_style),
(
"hunk-header-decoration-style",
String,
hunk_header_decoration_style
),
("hunk-header-style", String, hunk_header_style),
("keep-plus-minus-markers", bool, keep_plus_minus_markers),
("light", bool, light),
("max-line-distance", f64, max_line_distance),
// Hack: minus-style must come before minus-*emph-style because the latter default
// dynamically to the value of the former.
("minus-style", String, minus_style),
("minus-emph-style", String, minus_emph_style),
("minus-empty-line-marker-style", String, minus_empty_line_marker_style),
("minus-non-emph-style", String, minus_non_emph_style),
("navigate", bool, navigate),
("number", bool
|
