diff options
| -rw-r--r-- | src/nix-env/help.txt | 6 | ||||
| -rw-r--r-- | src/nix-env/main.cc | 102 |
2 files changed, 89 insertions, 19 deletions
diff --git a/src/nix-env/help.txt b/src/nix-env/help.txt index 4fc1602840c4..6ca5b3a3b862 100644 --- a/src/nix-env/help.txt +++ b/src/nix-env/help.txt @@ -36,10 +36,12 @@ Upgrade flags: Query types: - --name: print derivation names (default) + --status / -s: print installed/present status + --no-name: hide derivation names + --system: print the platform type of the derivation + --compare-versions / -c: compare version to available or installed --drv-path: print path of derivation --out-path: print path of derivation output - --status / -s: print installed/present status Query sources: diff --git a/src/nix-env/main.cc b/src/nix-env/main.cc index 96bbce5cf0dd..6d542c9b6d43 100644 --- a/src/nix-env/main.cc +++ b/src/nix-env/main.cc @@ -668,6 +668,53 @@ void printTable(Table & table) } +/* This function compares the version of a element against the + versions in the given set of elements. `cvLess' means that only + lower versions are in the set, `cvEqual' means that at most an + equal version is in the set, and `cvGreater' means that there is at + least one element with a higher version in the set. `cvUnavail' + means that there are no elements with the same name in the set. */ + +typedef enum { cvLess, cvEqual, cvGreater, cvUnavail } VersionDiff; + +static VersionDiff compareVersionAgainstSet( + const UserEnvElem & elem, const UserEnvElems & elems, string & version) +{ + DrvName name(elem.name); + + VersionDiff diff = cvUnavail; + version = "?"; + + for (UserEnvElems::const_iterator i = elems.begin(); i != elems.end(); ++i) { + DrvName name2(i->second.name); + if (name.name == name2.name) { + int d = compareVersions(name.version, name2.version); + if (d < 0) { + diff = cvGreater; + version = name2.version; + } + else if (diff != cvGreater && d == 0) { + diff = cvEqual; + version = name2.version; + } + else if (diff != cvGreater && diff != cvEqual && d > 0) { + diff = cvLess; + if (version == "" || compareVersions(version, name2.version) < 0) + version = name2.version; + } + } + } + + return diff; +} + + +static string colorString(const string & s) +{ + return "\e[1;31m" + s + "\e[0m"; +} + + static void opQuery(Globals & globals, Strings opFlags, Strings opArgs) { @@ -676,6 +723,7 @@ static void opQuery(Globals & globals, bool printSystem = false; bool printDrvPath = false; bool printOutPath = false; + bool compareVersions = false; enum { sInstalled, sAvailable } source = sInstalled; @@ -686,50 +734,50 @@ static void opQuery(Globals & globals, if (*i == "--status" || *i == "-s") printStatus = true; else if (*i == "--no-name") printName = false; else if (*i == "--system") printSystem = true; + else if (*i == "--compare-versions" || *i == "-c") compareVersions = true; else if (*i == "--drv-path") printDrvPath = true; else if (*i == "--out-path") printOutPath = true; else if (*i == "--installed") source = sInstalled; else if (*i == "--available" || *i == "-a") source = sAvailable; else throw UsageError(format("unknown flag `%1%'") % *i); - /* Obtain derivation information from the specified source. */ - UserEnvElems elems; - - switch (source) { + if (opArgs.size() != 0) throw UsageError("no arguments expected"); - case sInstalled: - elems = queryInstalled(globals.state, globals.profile); - break; + + /* Obtain derivation information from the specified source. */ + UserEnvElems availElems, installedElems; - case sAvailable: { - loadDerivations(globals.state, globals.instSource.nixExprPath, - globals.instSource.systemFilter, elems); - break; - } + if (source == sInstalled || compareVersions) { + installedElems = queryInstalled(globals.state, globals.profile); + } - default: abort(); + if (source == sAvailable || compareVersions) { + loadDerivations(globals.state, globals.instSource.nixExprPath, + globals.instSource.systemFilter, availElems); } - if (opArgs.size() != 0) throw UsageError("no arguments expected"); + UserEnvElems & elems(source == sInstalled ? installedElems : availElems); + UserEnvElems & otherElems(source == sInstalled ? availElems : installedElems); + /* Sort them by name. */ vector<UserEnvElem> elems2; for (UserEnvElems::iterator i = elems.begin(); i != elems.end(); ++i) elems2.push_back(i->second); sort(elems2.begin(), elems2.end(), cmpElemByName); + /* We only need to know the installed paths when we are querying the status of the derivation. */ PathSet installed; /* installed paths */ if (printStatus) { - UserEnvElems installedElems; - installedElems = queryInstalled(globals.state, globals.profile); for (UserEnvElems::iterator i = installedElems.begin(); i != installedElems.end(); ++i) installed.insert(i->second.queryOutPath(globals.state)); } - + + /* Print the desired columns. */ Table table; @@ -751,6 +799,26 @@ static void opQuery(Globals & globals, if (printSystem) columns.push_back(i->system); + if (compareVersions) { + /* Compare this element against the versions of the same + named packages in either the set of available elements, + or the set of installed elements. !!! This is O(N * + M), should be O(N * lg M). */ + string version; + VersionDiff diff = compareVersionAgainstSet(*i, otherElems, version); + char ch; + switch (diff) { + case cvLess: ch = '>'; break; + case cvEqual: ch = '='; break; + case cvGreater: ch = '<'; break; + case cvUnavail: ch = '-'; break; + default: abort(); + } + string column = (string) "" + ch + " " + version; + if (diff == cvGreater) column = colorString(column); + columns.push_back(column); + } + if (printDrvPath) columns.push_back( i->queryDrvPath(globals.state) == "" ? "-" : i->queryDrvPath(globals.state)); |