Make erasing partitions possible when using package metadata, improve error help

Author: jessebraham

espflash/src/cli/mod.rs

@@ -89,21 +89,10 @@ pub struct FlashArgs {
     #[arg(long, value_name = "FILE")]
     pub bootloader: Option<PathBuf>,
     /// Erase partitions by label
-    #[arg(
-        long,
-        requires = "partition_table",
-        value_name = "LABELS",
-        value_delimiter = ','
-    )]
+    #[arg(long, value_name = "LABELS", value_delimiter = ',')]
     pub erase_parts: Option<Vec<String>>,
     /// Erase specified data partitions
-    #[arg(
-        long,
-        requires = "partition_table",
-        value_name = "PARTS",
-        value_enum,
-        value_delimiter = ','
-    )]
+    #[arg(long, value_name = "PARTS", value_enum, value_delimiter = ',')]
     pub erase_data_parts: Option<Vec<DataType>>,
     /// Image format to flash
     #[arg(long, value_enum)]

espflash/src/error.rs

@@ -387,8 +387,11 @@ impl From<String> for MissingPartition {
 }
 
 #[derive(Debug, Error, Diagnostic)]
-#[error("No partition table could be found at the specified path")]
-#[diagnostic(code(espflash::partition_table::missing_partition_table))]
+#[error("No partition table could be found")]
+#[diagnostic(
+    code(espflash::partition_table::missing_partition_table),
+    help("Try providing a CSV or binary paritition table with the `--partition-table` argument.")
+)]
 pub struct MissingPartitionTable;
 
 #[derive(Debug, Error)]