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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file LICENSE.rst or https://cmake.org/licensing for details. */
#include "cmSetCommand.h"
#include "cmExecutionStatus.h"
#include "cmList.h"
#include "cmMakefile.h"
#include "cmMessageType.h"
#include "cmRange.h"
#include "cmState.h"
#include "cmStateTypes.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
#include "cmValue.h"
// cmSetCommand
bool cmSetCommand(std::vector<std::string> const& args,
cmExecutionStatus& status)
{
if (args.empty()) {
status.SetError("called with incorrect number of arguments");
return false;
}
// watch for ENV signatures
auto const& variable = args[0]; // VAR is always first
if (cmHasLiteralPrefix(variable, "ENV{") && variable.size() > 5) {
// what is the variable name
auto const& varName = variable.substr(4, variable.size() - 5);
std::string putEnvArg = varName + "=";
// what is the current value if any
std::string currValue;
bool const currValueSet = cmSystemTools::GetEnv(varName, currValue);
// will it be set to something, then set it
if (args.size() > 1 && !args[1].empty()) {
// but only if it is different from current value
if (!currValueSet || currValue != args[1]) {
putEnvArg += args[1];
cmSystemTools::PutEnv(putEnvArg);
}
// if there's extra arguments, warn user
// that they are ignored by this command.
if (args.size() > 2) {
std::string m = "Only the first value argument is used when setting "
"an environment variable. Argument '" +
args[2] + "' and later are unused.";
status.GetMakefile().IssueMessage(MessageType::AUTHOR_WARNING, m);
}
return true;
}
// if it will be cleared, then clear it if it isn't already clear
if (currValueSet) {
cmSystemTools::PutEnv(putEnvArg);
}
return true;
}
// SET (VAR) // Removes the definition of VAR.
if (args.size() == 1) {
status.GetMakefile().RemoveDefinition(variable);
return true;
}
// SET (VAR PARENT_SCOPE) // Removes the definition of VAR
// in the parent scope.
if (args.size() == 2 && args.back() == "PARENT_SCOPE") {
status.GetMakefile().RaiseScope(variable, nullptr);
return true;
}
// here are the remaining options
// SET (VAR value )
// SET (VAR value PARENT_SCOPE)
// SET (VAR CACHE TYPE "doc String" [FORCE])
// SET (VAR value CACHE TYPE "doc string" [FORCE])
std::string value; // optional
bool cache = false; // optional
bool force = false; // optional
bool parentScope = false;
cmStateEnums::CacheEntryType type =
cmStateEnums::STRING; // required if cache
cmValue docstring; // required if cache
unsigned int ignoreLastArgs = 0;
// look for PARENT_SCOPE argument
if (args.size() > 1 && args.back() == "PARENT_SCOPE") {
parentScope = true;
ignoreLastArgs++;
} else {
// look for FORCE argument
if (args.size() > 4 && args.back() == "FORCE") {
force = true;
ignoreLastArgs++;
}
// check for cache signature
if (args.size() > 3 &&
args[args.size() - 3 - (force ? 1 : 0)] == "CACHE") {
cache = true;
ignoreLastArgs += 3;
}
}
// collect any values into a single semi-colon separated value list
value =
cmList::to_string(cmMakeRange(args).advance(1).retreat(ignoreLastArgs));
if (parentScope) {
status.GetMakefile().RaiseScope(variable, value.c_str());
return true;
}
// we should be nice and try to catch some simple screwups if the last or
// next to last args are CACHE then they screwed up. If they used FORCE
// without CACHE they screwed up
if (args.back() == "CACHE") {
status.SetError(
"given invalid arguments for CACHE mode: missing type and docstring");
return false;
}
if (args.size() > 1 && args[args.size() - 2] == "CACHE") {
status.SetError(
"given invalid arguments for CACHE mode: missing type or docstring");
return false;
}
if (force && !cache) {
status.SetError("given invalid arguments: FORCE specified without CACHE");
return false;
}
if (cache) {
std::string::size_type cacheStart = args.size() - 3 - (force ? 1 : 0);
if (!cmState::StringToCacheEntryType(args[cacheStart + 1], type)) {
std::string m = "implicitly converting '" + args[cacheStart + 1] +
"' to 'STRING' type.";
status.GetMakefile().IssueMessage(MessageType::AUTHOR_WARNING, m);
// Setting this may not be required, since it's
// initialized as a string. Keeping this here to
// ensure that the type is actually converting to a string.
type = cmStateEnums::STRING;
}
docstring = cmValue{ args[cacheStart + 2] };
}
// see if this is already in the cache
cmState* state = status.GetMakefile().GetState();
cmValue existingValue = state->GetCacheEntryValue(variable);
if (existingValue &&
(state->GetCacheEntryType(variable) != cmStateEnums::UNINITIALIZED)) {
// if the set is trying to CACHE the value but the value
// is already in the cache and the type is not internal
// then leave now without setting any definitions in the cache
// or the makefile
if (cache && type != cmStateEnums::INTERNAL && !force) {
return true;
}
}
// if it is meant to be in the cache then define it in the cache
if (cache) {
status.GetMakefile().AddCacheDefinition(variable, cmValue{ value },
docstring, type, force);
} else {
// add the definition
status.GetMakefile().AddDefinition(variable, value);
}
return true;
}
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