canonicalize QSV_DOTENV_PATH

docs/ENVIRONMENT_VARIABLES.md

@@ -2,7 +2,7 @@
 
 | Variable | Description |
 | --- | --- |
-| `QSV_DOTENV_PATH` | The filename of the dotenv file to load, OVERRIDING existing environment variables. This takes precedence over any other dotenv file in the filesystem. |
+| `QSV_DOTENV_PATH` | The full pathname of the dotenv file to load, OVERRIDING existing environment variables. This takes precedence over any other dotenv files in the filesystem. |
 | `QSV_DEFAULT_DELIMITER` | single ascii character to use as delimiter.  Overrides `--delimiter` option. Defaults to "," (comma) for CSV files & "\t" (tab) for TSV files when not set. Note that this will also set the delimiter for qsv's output to stdout.<br>However, using the `--output` option, regardless of this environment variable, will automatically change the delimiter used in the generated file based on the file extension - i.e. comma for `.csv`, tab for `.tsv` & `.tab` files. |
 | `QSV_SNIFF_DELIMITER` | if set, the delimiter is automatically detected. Overrides `QSV_DEFAULT_DELIMITER` & `--delimiter` option. Note that this does not work with stdin. |
 | `QSV_NO_HEADERS` | if set, the first row will **NOT** be interpreted as headers. Supersedes `QSV_TOGGLE_HEADERS`. |

src/util.rs

@@ -1225,12 +1225,14 @@ pub fn load_dotenv() -> CliResult<()> {
     // whatever manually set environment variables are present.
 
     if let Ok(dotenv_path) = std::env::var("QSV_DOTENV_PATH") {
-        if let Err(e) = dotenvy::from_filename_override(dotenv_path.clone()) {
+        let canonical_dotenv_path = std::fs::canonicalize(dotenv_path)?;
+        if let Err(e) = dotenvy::from_filename_override(canonical_dotenv_path.clone()) {
             return fail_clierror!(
-                "Cannot process .env file set in QSV_DOTENV_PATH - {dotenv_path}: {e}"
+                "Cannot process .env file set in QSV_DOTENV_PATH - {}: {e}",
+                canonical_dotenv_path.display()
             );
         }
-        log::info!("Using .env file: {dotenv_path}");
+        log::info!("Using .env file: {}", canonical_dotenv_path.display());
         return Ok(());
     }