Implement `as Text` imports

7 files changed, 33 insertions, 16 deletions

diff --git a/dhall/build.rs b/dhall/build.rs
index 0ff5acc..29219ff 100644
--- a/dhall/build.rs
+++ b/dhall/build.rs
@@ -249,18 +249,15 @@ fn generate_tests() -> std::io::Result<()> {
             too_slow_path: Box::new(|_path: &str| false),
             exclude_path: Box::new(|path: &str| {
                 false
-                    || path == "alternativeEnvNatural"
-                    || path == "alternativeEnvSimple"
+                    // TODO: import hash
                     || path == "alternativeHashMismatch"
+                    || path == "hashFromCache"
+                    || path == "unit/AlternativeHashMismatch"
+                    // TODO: remote imports
                     || path == "asLocation"
-                    || path == "asText"
                     || path == "customHeaders"
-                    || path == "hashFromCache"
                     || path == "headerForwarding"
                     || path == "noHeaderForwarding"
-                    || path == "unit/AlternativeHashMismatch"
-                    || path == "unit/AsText"
-                    || path == "unit/EnvSetAsText"
                     || path == "unit/SimpleRemote"
                     || path == "unit/asLocation/Remote"
             }),
@@ -274,12 +271,11 @@ fn generate_tests() -> std::io::Result<()> {
             too_slow_path: Box::new(|_path: &str| false),
             exclude_path: Box::new(|path: &str| {
                 false
-                    || path == "alternativeEnv"
-                    || path == "alternativeEnvMissing"
-                    || path == "customHeadersUsingBoundVariable"
+                    // TODO: import hash
                     || path == "hashMismatch"
+                    // TODO: remote imports
+                    || path == "customHeadersUsingBoundVariable"
                     || path == "referentiallyInsane"
-                    || path == "unit/EnvUnsetAsText"
             }),
             input_type: FileType::Text,
             output_type: Some(FileType::UI),
diff --git a/dhall/src/semantics/parse.rs b/dhall/src/semantics/parse.rs
index ee35536..ffd5eca 100644
--- a/dhall/src/semantics/parse.rs
+++ b/dhall/src/semantics/parse.rs
@@ -9,9 +9,8 @@ use crate::syntax::parse_expr;
 use crate::Parsed;
 
 pub(crate) fn parse_file(f: &Path) -> Result<Parsed, Error> {
-    let mut buffer = String::new();
-    File::open(f)?.read_to_string(&mut buffer)?;
-    let expr = parse_expr(&*buffer)?;
+    let text = std::fs::read_to_string(f)?;
+    let expr = parse_expr(&text)?;
     let root = ImportRoot::LocalDir(f.parent().unwrap().to_owned());
     Ok(Parsed(expr, root))
 }
diff --git a/dhall/src/semantics/resolve/resolve.rs b/dhall/src/semantics/resolve/resolve.rs
index ad2cd75..f419858 100644
--- a/dhall/src/semantics/resolve/resolve.rs
+++ b/dhall/src/semantics/resolve/resolve.rs
@@ -99,7 +99,26 @@ fn resolve_one_import(
             let typed = resolve_with_env(env, parsed)?.typecheck()?;
             Ok((typed.normalize().to_hir(), typed.ty().clone()))
         }
-        ImportMode::RawText => unimplemented!("{:?}", import),
+        ImportMode::RawText => {
+            let text = match &import.location {
+                ImportLocation::Local(prefix, path) => {
+                    let path = compute_relative_path(root, prefix, path);
+                    std::fs::read_to_string(path)?
+                }
+                ImportLocation::Env(var_name) => match env::var(var_name) {
+                    Ok(val) => val,
+                    Err(_) => Err(ImportError::MissingEnvVar)?,
+                },
+                ImportLocation::Missing => Err(ImportError::Missing)?,
+                _ => unimplemented!("{:?}", import),
+            };
+
+            let hir = Hir::new(
+                HirKind::Expr(ExprKind::TextLit(text.into())),
+                Span::Artificial,
+            );
+            Ok((hir, Type::from_builtin(Builtin::Text)))
+        }
         ImportMode::Location => {
             let (field_name, arg) = match &import.location {
                 ImportLocation::Local(prefix, path) => {
diff --git a/dhall/tests/import/failure/alternativeEnv.txt b/dhall/tests/import/failure/alternativeEnv.txt
new file mode 100644
index 0000000..482b68c
--- /dev/null
+++ b/dhall/tests/import/failure/alternativeEnv.txt
@@ -0,0 +1 @@
+MissingEnvVar
diff --git a/dhall/tests/import/failure/alternativeEnvMissing.txt b/dhall/tests/import/failure/alternativeEnvMissing.txt
new file mode 100644
index 0000000..4666330
--- /dev/null
+++ b/dhall/tests/import/failure/alternativeEnvMissing.txt
@@ -0,0 +1 @@
+Missing
diff --git a/dhall/tests/import/failure/unit/EnvUnsetAsText.txt b/dhall/tests/import/failure/unit/EnvUnsetAsText.txt
new file mode 100644
index 0000000..482b68c
--- /dev/null
+++ b/dhall/tests/import/failure/unit/EnvUnsetAsText.txt
@@ -0,0 +1 @@
+MissingEnvVar
diff --git a/dhall/tests/import/success/unit/EnvSetAsTextB.dhall b/dhall/tests/import/success/unit/EnvSetAsTextB.dhall
index 192548e..a79bb82 100644
--- a/dhall/tests/import/success/unit/EnvSetAsTextB.dhall
+++ b/dhall/tests/import/success/unit/EnvSetAsTextB.dhall
@@ -1 +1 @@
-"42"
+"6 * 7"