Add time based placeholders for scan/visit templates

{ts_hms} for HourMinuteSecond, eg 142117
{ts_ymd} for YearMonthDay, eg 20250221

Author: tpoliaw

src/graphql/mod.rs

@@ -33,7 +33,7 @@ use axum::{Extension, Json, Router};
 use axum_extra::headers::authorization::Bearer;
 use axum_extra::headers::Authorization;
 use axum_extra::TypedHeader;
-use chrono::{Datelike, Local};
+use chrono::{DateTime, Datelike, Local};
 use derive_more::{Display, Error};
 use tokio::net::TcpListener;
 use tracing::{debug, info, instrument, trace, warn};
@@ -145,6 +145,7 @@ struct DirectoryPath {
 struct ScanPaths {
     directory: DirectoryPath,
     subdirectory: Subdirectory,
+    timestamp: DateTime<Local>,
 }
 
 /// GraphQL type to provide current configuration for an instrument
@@ -308,6 +309,8 @@ impl FieldSource<ScanField> for ScanPaths {
             ScanField::Subdirectory => self.subdirectory.to_string().into(),
             ScanField::ScanNumber => self.directory.info.scan_number().to_string().into(),
             ScanField::Directory(dir) => self.directory.resolve(dir),
+            ScanField::YearMonthDay => self.timestamp.format("%Y%m%d").to_string().into(),
+            ScanField::HourMinuteSecond => self.timestamp.format("%H%M%S").to_string().into(),
         }
     }
 }
@@ -425,6 +428,7 @@ impl Mutation {
                 instrument_session,
                 info: next_scan,
             },
+            timestamp: Local::now(),
             subdirectory: sub.unwrap_or_default(),
         })
     }

src/paths.rs

@@ -38,6 +38,10 @@ pub enum ScanField {
     Subdirectory,
     #[display("scan_number")]
     ScanNumber,
+    #[display("ts_ymd")]
+    YearMonthDay,
+    #[display("ts_hms")]
+    HourMinuteSecond,
     #[display("{_0}")]
     Directory(DirectoryField),
 }
@@ -73,6 +77,8 @@ impl TryFrom<String> for ScanField {
         match value.as_str() {
             "scan_number" => Ok(ScanField::ScanNumber),
             "subdirectory" => Ok(ScanField::Subdirectory),
+            "ts_hms" => Ok(ScanField::HourMinuteSecond),
+            "ts_ymd" => Ok(ScanField::YearMonthDay),
             _ => Ok(ScanField::Directory(DirectoryField::try_from(value)?)),
         }
     }