From a57fee0a86253e2c123d1154034bc5b51fa80740 Mon Sep 17 00:00:00 2001
From: "Neal H. Walfield" <neal@gnu.org>
Date: Thu, 19 Aug 2021 13:17:59 +0200
Subject: [PATCH] Fix the package config template and generate it
 automatically.

  - Fix the stale package config template.

  - Always generate it when building.
---
 build.rs                         | 59 ++++++++++++++++++++++++++++++++
 pep_engine_sequoia_backend.pc.in | 10 ++++++
 sequoia-pep-engine-crypto.pc.in  | 11 ------
 3 files changed, 69 insertions(+), 11 deletions(-)
 create mode 100644 build.rs
 create mode 100644 pep_engine_sequoia_backend.pc.in
 delete mode 100644 sequoia-pep-engine-crypto.pc.in

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..8acb8a1
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,59 @@
+use std::env;
+use std::fs::File;
+use std::io::{Read, Write};
+use std::path::PathBuf;
+
+fn main() -> Result<(), std::io::Error> {
+    // Generate
+    // ${CARGO_TARGET_DIR}/${PROFILE}/pep_engine_sequoia_backend.pc from
+    // ${SRC}/pep_engine_sequoia_backend.pc.in.
+
+    // Location of pep_engine_sequoia_backend.pc.in.
+    let src = env::current_dir()?;
+    let mut pc_in = PathBuf::from(&src);
+    pc_in.push("pep_engine_sequoia_backend.pc.in");
+
+    // Location of the build directory (e.g.,
+    // `/tmp/pep_engine_sequoia_backend/debug`).
+    let mut build_dir = PathBuf::from(&src);
+    if let Some(target_dir) = env::var_os("CARGO_TARGET_DIR") {
+        // If CARGO_TARGET_DIR is absolute, this will first clear pc.
+        build_dir.push(target_dir);
+    }
+    let profile = env::var_os("PROFILE")
+        .expect("PROFILE not set");
+    build_dir.push(&profile);
+
+    // Location of pep_engine_sequoia_backend.pc.
+    let mut pc = build_dir.clone();
+    pc.push("pep_engine_sequoia_backend.pc");
+
+    // Read the .pc.in file, do the substitutions, and generate the
+    // .pc file.
+    let mut pc_in = File::open(pc_in)?;
+    let mut content = Vec::new();
+    pc_in.read_to_end(&mut content)?;
+
+    // This is set to allow the use of the library from the build
+    // directory.
+    let content = String::from_utf8(content).unwrap()
+        .replace("LIBDIR",
+                 &build_dir
+                     .to_str()
+                     .expect("build directory is not UTF-8 encoded"))
+        .replace("VERSION",
+                 &env::var_os("CARGO_PKG_VERSION")
+                     .expect("CARGO_PKG_VERSION not set")
+                     .into_string()
+                     .expect("CARGO_PKG_VERSION is not UTF-8 encoded"));
+
+    let mut pc = File::create(&pc).unwrap();
+    pc.write_all(content.as_bytes())?;
+
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=pep_engine_sequoia_backend.pc.in");
+
+    eprintln!("Generated {:?} with:\n{}\nEOF", pc, content);
+
+    Ok(())
+}
diff --git a/pep_engine_sequoia_backend.pc.in b/pep_engine_sequoia_backend.pc.in
new file mode 100644
index 0000000..0fd349d
--- /dev/null
+++ b/pep_engine_sequoia_backend.pc.in
@@ -0,0 +1,10 @@
+prefix=
+libdir=LIBDIR
+
+Name: pEpEngineSequoiaBackend
+Description: An implementation of the pEp Engine's crypttext interface using Sequoia
+URL: https://sequoia-pgp.org/
+Version: VERSION
+Requires: nettle
+Cflags:
+Libs: -L${libdir} -lpep_engine_sequoia_backend
diff --git a/sequoia-pep-engine-crypto.pc.in b/sequoia-pep-engine-crypto.pc.in
deleted file mode 100644
index 838cd0a..0000000
--- a/sequoia-pep-engine-crypto.pc.in
+++ /dev/null
@@ -1,11 +0,0 @@
-prefix=PREFIX
-libdir=${prefix}/lib
-includedir=${prefix}/include
-
-Name: pEp-Engine-sequoia
-Description: pEp Engine's cryptographic backend using Sequoia
-URL: https://sequoia-pgp.org/
-Version: VERSION
-Requires: nettle sequoia-openpgp
-Cflags: -I${includedir}
-Libs: -L${libdir} -lsequoia_pep_engine_crypto
-- 
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