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* `dependencyClosure' now allows a search path, e.g.,

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dependencyClosure { ... searchPath = [ ../foo ../bar ]; ... }

* Primop `dirOf' to return the directory part of a path (e.g., dirOf
  /a/b/c == /a/b).

* Primop `relativise' (according to Webster that's a real word!) that
  given paths A and B returns a string representing path B relative
  path to A; e.g., relativise /a/b/c a/b/x/y => "../x/y".
This commit is contained in:
Eelco Dolstra 2005-08-14 14:00:39 +00:00
parent 08c53923db
commit e1a6fb7870
5 changed files with 89 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

87
src/libexpr/primops.cc
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@ -372,6 +372,14 @@ static Expr primBaseNameOf(EvalState & state, const ATermVector & args)
}
/* Return the directory of the given path, i.e., everything before the
last slash. */
static Expr primDirOf(EvalState & state, const ATermVector & args)
{
return makePath(toATerm(dirOf(evalPath(state, args[0]))));
}
/* Convert the argument (which can be a path or a uri) to a string. */
static Expr primToString(EvalState & state, const ATermVector & args)
{
@ -410,12 +418,12 @@ static Expr primIsNull(EvalState & state, const ATermVector & args)
}
static Path findDependency(Path start, string dep)
static Path findDependency(Path dir, string dep)
{
if (dep[0] == '/') throw Error(
format("illegal absolute dependency `%1%'") % dep);
Path p = canonPath(dirOf(start) + "/" + dep);
Path p = canonPath(dir + "/" + dep);
if (pathExists(p))
return p;
@ -464,11 +472,11 @@ static string relativise(Path pivot, Path p)
static Expr primDependencyClosure(EvalState & state, const ATermVector & args)
{
startNest(nest, lvlDebug, "finding dependencies");
Expr attrs = evalExpr(state, args[0]);
Expr scanner = queryAttr(attrs, "scanner");
if (!scanner) throw Error("attribute `scanner' required");
/* Get the start set. */
Expr startSet = queryAttr(attrs, "startSet");
if (!startSet) throw Error("attribute `startSet' required");
ATermList startSet2 = evalList(state, startSet);
@ -481,6 +489,20 @@ static Expr primDependencyClosure(EvalState & state, const ATermVector & args)
pivot = dirOf(p);
}
/* Get the search path. */
PathSet searchPath;
Expr e = queryAttr(attrs, "searchPath");
if (e) {
ATermList list = evalList(state, e);
for (ATermIterator i(list); i; ++i) {
Path p = evalPath(state, *i);
searchPath.insert(p);
}
}
Expr scanner = queryAttr(attrs, "scanner");
if (!scanner) throw Error("attribute `scanner' required");
/* Construct the dependency closure by querying the dependency of
each path in `workSet', adding the dependencies to
`workSet'. */
@ -492,19 +514,38 @@ static Expr primDependencyClosure(EvalState & state, const ATermVector & args)
if (doneSet.find(path) != doneSet.end()) continue;
doneSet.insert(path);
/* Call the `scanner' function with `path' as argument. */
printMsg(lvlError, format("finding dependencies in `%1%'") % path);
ATermList deps = evalList(state, makeCall(scanner, makePath(toATerm(path))));
try {
/* Call the `scanner' function with `path' as argument. */
debug(format("finding dependencies in `%1%'") % path);
ATermList deps = evalList(state, makeCall(scanner, makePath(toATerm(path))));
/* Try to find the dependencies relative to the `path'. */
for (ATermIterator i(deps); i; ++i) {
Path dep = findDependency(path, evalString(state, *i));
if (dep == "")
printMsg(lvlError, format("did NOT find dependency `%1%'") % dep);
else {
printMsg(lvlError, format("found dependency `%1%'") % dep);
workSet.insert(dep);
/* Try to find the dependencies relative to the `path'. */
for (ATermIterator i(deps); i; ++i) {
string s = evalString(state, *i);
Path dep = findDependency(dirOf(path), s);
if (dep == "") {
for (PathSet::iterator j = searchPath.begin();
j != searchPath.end(); ++j)
{
dep = findDependency(*j, s);
if (dep != "") break;
}
}
if (dep == "")
debug(format("did NOT find dependency `%1%'") % s);
else {
debug(format("found dependency `%1%'") % dep);
workSet.insert(dep);
}
}
} catch (Error & e) {
throw Error(format("while finding dependencies in `%1%':\n%2%")
% path % e.msg());
}
}
@ -515,7 +556,7 @@ static Expr primDependencyClosure(EvalState & state, const ATermVector & args)
deps = ATinsert(deps, makePath(toATerm(*i)));
}
printMsg(lvlError, format("RESULT is `%1%'") % makeList(deps));
debug(format("dependency list is `%1%'") % makeList(deps));
return makeList(deps);
}
@ -566,6 +607,14 @@ static Expr primRemoveAttrs(EvalState & state, const ATermVector & args)
}
static Expr primRelativise(EvalState & state, const ATermVector & args)
{
Path pivot = evalPath(state, args[0]);
Path path = evalPath(state, args[1]);
return makeStr(toATerm(relativise(pivot, path)));
}
void EvalState::addPrimOps()
{
addPrimOp("true", 0, primTrue);
@ -578,12 +627,12 @@ void EvalState::addPrimOps()
addPrimOp("derivation!", 1, primDerivationStrict);
addPrimOp("derivation", 1, primDerivationLazy);
addPrimOp("baseNameOf", 1, primBaseNameOf);
addPrimOp("dirOf", 1, primDirOf);
addPrimOp("toString", 1, primToString);
addPrimOp("isNull", 1, primIsNull);
addPrimOp("dependencyClosure", 1, primDependencyClosure);
addPrimOp("map", 2, primMap);
addPrimOp("removeAttrs", 2, primRemoveAttrs);
addPrimOp("relativise", 2, primRelativise);
}