Add time based placeholders for scan/visit templates

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

Author: tpoliaw

src/graphql.rs

@@ -37,7 +37,7 @@ 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 tokio::net::TcpListener;
 use tracing::{info, instrument, trace, warn};
 
@@ -147,6 +147,7 @@ struct VisitPath {
 struct ScanPaths {
     visit: VisitPath,
     subdirectory: Subdirectory,
+    timestamp: DateTime<Local>,
 }
 
 /// GraphQL type to provide current configuration for a beamline
@@ -301,6 +302,8 @@ impl FieldSource<ScanField> for ScanPaths {
             ScanField::Subdirectory => self.subdirectory.to_string().into(),
             ScanField::ScanNumber => self.visit.info.scan_number().to_string().into(),
             ScanField::Beamline(bl) => self.visit.resolve(bl),
+            ScanField::YearMonthDay => self.timestamp.format("%Y%m%d").to_string().into(),
+            ScanField::HourMinuteSecond => self.timestamp.format("%H%M%S").to_string().into(),
         }
     }
 }
@@ -427,6 +430,7 @@ impl Mutation {
                 visit,
                 info: next_scan,
             },
+            timestamp: Local::now(),
             subdirectory: sub.unwrap_or_default(),
         })
     }

src/paths.rs

@@ -31,6 +31,8 @@ pub enum BeamlineField {
 pub enum ScanField {
     Subdirectory,
     ScanNumber,
+    YearMonthDay,
+    HourMinuteSecond,
     Beamline(BeamlineField),
 }
 
@@ -57,6 +59,8 @@ impl Display for ScanField {
             ScanField::Subdirectory => f.write_str("subdirectory"),
             ScanField::ScanNumber => f.write_str("scan_number"),
             ScanField::Beamline(bl) => write!(f, "{bl}"),
+            ScanField::YearMonthDay => f.write_str("ts_ymd"),
+            ScanField::HourMinuteSecond => f.write_str("ts_hms"),
         }
     }
 }
@@ -100,6 +104,8 @@ 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::Beamline(BeamlineField::try_from(value)?)),
         }
     }