use faster to_ascii_lowercase when possible

src/cmd/apply.rs

@@ -595,7 +595,7 @@ pub fn run(argv: &[&str]) -> CliResult<()> {
     // we set it to empty string
     let flag_replacement = if apply_cmd == ApplySubCmd::Operations
         && ops_vec.contains(&Operations::Regex_Replace)
-        && args.flag_replacement.to_lowercase() == NULL_VALUE
+        && args.flag_replacement.to_ascii_lowercase() == NULL_VALUE
     {
         String::new()
     } else {

src/cmd/applydp.rs

@@ -430,7 +430,7 @@ pub fn run(argv: &[&str]) -> CliResult<()> {
     // we set it to empty string
     let flag_replacement = if applydp_cmd == ApplydpSubCmd::Operations
         && ops_vec.contains(&Operations::Regex_Replace)
-        && args.flag_replacement.to_lowercase() == NULL_VALUE
+        && args.flag_replacement.to_ascii_lowercase() == NULL_VALUE
     {
         String::new()
     } else {

src/cmd/excel.rs

@@ -231,7 +231,7 @@ pub fn run(argv: &[&str]) -> CliResult<()> {
         .extension()
         .and_then(std::ffi::OsStr::to_str)
         .unwrap_or_default()
-        .to_lowercase();
+        .to_ascii_lowercase();
     let ods_flag = match format.as_str() {
         "xls" | "xlsx" | "xlsm" | "xlsb" => false,
         "ods" => true,

src/cmd/luau.rs

@@ -1413,7 +1413,7 @@ fn create_index(arg_input: &Option<String>) -> Result<bool, CliError> {
         return Ok(false);
     };
 
-    if input.to_lowercase().ends_with(".sz") {
+    if input.to_ascii_lowercase().ends_with(".sz") {
         log::warn!("qsv_autoindex() does not work with snappy files.");
         return Ok(false);
     }
@@ -1481,7 +1481,7 @@ fn setup_helpers(
             let val = luau.from_value::<serde_json::Value>(val)?;
             let val_str = &serde_json::to_string_pretty(&val).unwrap_or_default();
             if idx == 0 {
-                log_level = val_str.trim_matches('"').to_lowercase();
+                log_level = val_str.trim_matches('"').to_ascii_lowercase();
             } else {
                 log_msg.push_str(val_str.trim_matches('"'));
                 if idx == u8::MAX {

src/cmd/sqlp.rs

@@ -351,7 +351,7 @@ impl FromStr for OutputMode {
     type Err = String;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s.to_lowercase().as_str() {
+        match s.to_ascii_lowercase().as_str() {
             "csv" => Ok(OutputMode::Csv),
             "json" => Ok(OutputMode::Json),
             "parquet" => Ok(OutputMode::Parquet),
@@ -376,7 +376,7 @@ impl FromStr for PqtCompression {
     type Err = String;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s.to_lowercase().as_str() {
+        match s.to_ascii_lowercase().as_str() {
             "uncompressed" => Ok(PqtCompression::Uncompressed),
             "gzip" => Ok(PqtCompression::Gzip),
             "snappy" => Ok(PqtCompression::Snappy),

src/cmd/stats.rs

@@ -316,7 +316,7 @@ pub fn run(argv: &[&str]) -> CliResult<()> {
             false
         } else {
             let p = args.flag_output.clone().unwrap();
-            p.to_lowercase().ends_with(".sz")
+            p.to_ascii_lowercase().ends_with(".sz")
         },
         canonical_input_path: String::new(),
         canonical_stats_path: String::new(),
@@ -888,7 +888,7 @@ fn init_date_inference(
     let dmy_preferred = prefer_dmy || util::get_envvar_flag("QSV_PREFER_DMY");
     DMY_PREFERENCE.store(dmy_preferred, Ordering::Relaxed);
 
-    let whitelist_lower = flag_whitelist.to_lowercase();
+    let whitelist_lower = flag_whitelist.to_ascii_lowercase();
     log::info!("inferring dates with date-whitelist: {whitelist_lower}");
 
     let infer_date_flags = if whitelist_lower == "all" {

src/config.rs

@@ -131,7 +131,7 @@ impl Config {
                     .unwrap_or_default()
                     .to_str()
                     .unwrap()
-                    .to_lowercase();
+                    .to_ascii_lowercase();
                 let mut snappy = false;
                 let delim = if file_extension == "tsv" || file_extension == "tab" {
                     b'\t'

src/util.rs

@@ -260,7 +260,7 @@ pub fn show_env_vars() {
         #[cfg(feature = "mimalloc")]
         if env_var.starts_with("QSV_")
             || env_var.starts_with("MIMALLOC_")
-            || OTHER_ENV_VARS.contains(&env_var.to_lowercase().as_str())
+            || OTHER_ENV_VARS.contains(&env_var.to_ascii_lowercase().as_str())
         {
             env_var_set = true;
             woutinfo!("{env_var}: {v:?}");
@@ -269,13 +269,14 @@ pub fn show_env_vars() {
         if env_var.starts_with("QSV_")
             || env_var.starts_with("JEMALLOC_")
             || env_var.starts_with("MALLOC_CONF")
-            || OTHER_ENV_VARS.contains(&env_var.to_lowercase().as_str())
+            || OTHER_ENV_VARS.contains(&env_var.to_ascii_lowercase().as_str())
         {
             env_var_set = true;
             woutinfo!("{env_var}: {v:?}");
         }
         #[cfg(not(any(feature = "mimalloc", feature = "jemallocator")))]
-        if env_var.starts_with("QSV_") || OTHER_ENV_VARS.contains(&env_var.to_lowercase().as_str())
+        if env_var.starts_with("QSV_")
+            || OTHER_ENV_VARS.contains(&env_var.to_ascii_lowercase().as_str())
         {
             env_var_set = true;
             woutinfo!("{env_var}: {v:?}");