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Support tab-completion on attribute sets

Browse source 
Example:

$ nix-repl '<nixos>'

> config.services.xserver.desktop<TAB>

comletes to

> config.services.xserver.desktopManager

You also get suggestions if there are multiple matches:

> config.services.xserver.desktopManager.kde4
config.services.xserver.desktopManager.kde4.enable
config.services.xserver.desktopManager.kde4.phononBackends
This commit is contained in:
Eelco Dolstra 2013-09-09 12:00:33 +02:00
parent 8e765b8876
commit e133e91410
1 changed files with 34 additions and 5 deletions
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29
nix-repl.cc
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@ -183,12 +183,41 @@ void NixRepl::completePrefix(string prefix)
{
completions.clear();
size_t dot = prefix.rfind('.');
if (dot == string::npos) {
/* This is a variable name; look it up in the current scope. */
StringSet::iterator i = varNames.lower_bound(prefix);
while (i != varNames.end()) {
if (string(*i, 0, prefix.size()) != prefix) break;
completions.insert(*i);
i++;
}
} else {
try {
/* This is an expression that should evaluate to an
attribute set. Evaluate it to get the names of the
attributes. */
string expr(prefix, 0, dot);
string prefix2 = string(prefix, dot + 1);
Expr * e = parseString(expr);
Value v;
e->eval(state, *env, v);
state.forceAttrs(v);
foreach (Bindings::iterator, i, *v.attrs) {
string name = i->name;
if (string(name, 0, prefix2.size()) != prefix2) continue;
completions.insert(expr + "." + name);
}
} catch (ParseError & e) {
// Quietly ignore parse errors.
}catch (EvalError & e) {
// Quietly ignore evaluation errors.
}
}
}