tools(foreach): replace relative to absolute paths in build output

scripts/foreach.sh

@@ -19,9 +19,11 @@
 #
 # --------------------------------------------------------------------------------------------------
 set -euo pipefail
+scriptdir=$(cd $(dirname $0) && pwd)
 statefile="${HOME}/.foreach.state"
 commandfile="${HOME}/.foreach.command"
 command_arg="${@:-}"
+base=$PWD
 
 function heading {
   printf "\e[38;5;81m$@\e[0m\n"
@@ -70,7 +72,9 @@ heading "${next}: ${command} (${remaining} remaining)"
 
 (
   cd ${next}
-  ${command} || {
+  ${command} &> /tmp/foreach.stdio || {
+    cd ${base}
+    cat /tmp/foreach.stdio | ${scriptdir}/path-prefix ${next}
     error "error: last command failed. fix problem and resume by executing: $0"
     error "directory:    ${next}"
     exit 1

scripts/path-prefix

@@ -0,0 +1,38 @@
+#!/usr/bin/env node
+// converts relative file paths at the beginning of each input line to absolute file paths
+const path = require('path');
+const fs = require('fs');
+const rl = require('readline');
+
+const REMOVE_COLORS = /[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g;
+
+const dir = process.argv[2];
+if (!dir) {
+  throw new Error(`usage: path-prefix DIR`);
+}
+
+const reldir = path.relative(process.cwd(), dir);
+
+const ifc = rl.createInterface(process.stdin);
+ifc.on('line', line => {
+  line = line.toString();
+  const [ relative, ...rest ] = line.split(':');
+  const rel = relative.replace(REMOVE_COLORS, '');
+  const absolute = path.join(dir, rel);
+  if (relative && fs.existsSync(absolute)) {
+    process.stdout.write(path.join(reldir, rel) + ':' + rest.join(':') + '\n');
+  } else {
+    process.stdout.write(line + '\n');
+  }
+});
+
+process.stdin.resume();
+
+function exists(p) {
+  try {
+    fs.readFileSync(p);
+    return true;
+  } catch (e) {
+    return false;
+  }
+}