From 110029ce3b7f205cce01f7d74dd2c8777f860c31 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Tue, 6 Apr 2021 16:20:09 -0600
Subject: implement exported variables

---
 src/makefile/input.rs | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to 'src/makefile/input.rs')

diff --git a/src/makefile/input.rs b/src/makefile/input.rs
index 13ced8e..7651306 100644
--- a/src/makefile/input.rs
+++ b/src/makefile/input.rs
@@ -16,6 +16,8 @@ use super::command_line::CommandLine;
 #[cfg(feature = "full")]
 use super::conditional::{Line as ConditionalLine, State as ConditionalState};
 use super::inference_rules::InferenceRule;
+#[cfg(feature = "full")]
+use super::r#macro::ExportConfig;
 use super::r#macro::{Macro, Set as MacroSet, Source as MacroSource};
 use super::target::Target;
 use super::token::{tokenize, Token, TokenString};
@@ -295,12 +297,27 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
                 LineType::Macro => self.read_macro(line_tokens, line_number)?,
                 LineType::Unknown => {
                     if !line_tokens.is_empty() {
+                        // TODO handle assignments here
                         #[cfg(feature = "full")]
                         if line_tokens.starts_with("export") {
-                            log::error!("export directive not supported yet");
+                            let mut line_tokens = line_tokens;
+                            line_tokens.strip_prefix("export");
+                            if line_tokens.is_empty() {
+                                self.macros.exported = ExportConfig::all_but();
+                            } else {
+                                let exported = self.expand_macros(&line_tokens)?;
+                                self.macros.exported.add_all(exported.split_whitespace());
+                            }
                             continue;
                         } else if line_tokens.starts_with("unexport") {
-                            log::error!("unexport directive not supported yet");
+                            let mut line_tokens = line_tokens;
+                            line_tokens.strip_prefix("unexport");
+                            if line_tokens.is_empty() {
+                                self.macros.exported = ExportConfig::only();
+                            } else {
+                                let exported = self.expand_macros(&line_tokens)?;
+                                self.macros.exported.remove_all(exported.split_whitespace());
+                            }
                             continue;
                         }
                         bail!(
@@ -423,6 +440,7 @@ impl<'a, 'parent, R: BufRead> MakefileReader<'a, 'parent, R> {
         let (targets, not_targets) = line_tokens
             .split_once(':')
             .ok_or_else(|| eyre!("read_rule couldn't find a ':' on line {}", line_number))?;
+        // TODO handle rule-specific variables
         let targets = self.expand_macros(&targets)?;
         let targets = targets.split_whitespace().collect::<Vec<_>>();
         let (prerequisites, mut commands) = match not_targets.split_once(';') {
-- 
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