github.com/goplus/igop@v0.25.0/cmd/internal/base/flag.go (about)

     1  /*
     2   * Copyright (c) 2022 The GoPlus Authors (goplus.org). All rights reserved.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package base
    18  
    19  import (
    20  	"go/build"
    21  	"runtime"
    22  	"strings"
    23  
    24  	"github.com/goplus/igop/load"
    25  )
    26  
    27  var (
    28  	BuildContext = defaultContext()
    29  	// BuildMod         string // -mod flag
    30  	BuildModExplicit bool // whether -mod was set explicitly
    31  	BuildX           bool // -x flag
    32  	BuildV           bool // -v flag
    33  	BuildSSA         bool // -ssa flag
    34  	DebugSSATrace    bool // -ssa-trace flag
    35  	ExperimentalGC   bool // -exp-gc flag experimental support runtime.GC
    36  )
    37  
    38  func defaultContext() build.Context {
    39  	runtime.GC()
    40  	return build.Default
    41  }
    42  
    43  type BuildFlagMask int
    44  
    45  const (
    46  	DefaultBuildFlags BuildFlagMask = 0
    47  	OmitModFlag       BuildFlagMask = 1 << iota
    48  	OmitVFlag
    49  	OmitSSAFlag
    50  	OmitSSATraceFlag
    51  	OmitExperimentalGCFlag
    52  )
    53  
    54  // AddBuildFlags adds the flags common to the build, run, and test commands.
    55  func AddBuildFlags(cmd *Command, mask BuildFlagMask) {
    56  	cmd.Flag.BoolVar(&BuildX, "x", false, "print the commands.")
    57  	if mask&OmitVFlag != 0 {
    58  		cmd.Flag.BoolVar(&BuildV, "v", false, "print the names of packages as they are compiled.")
    59  	}
    60  	if mask&OmitModFlag != 0 {
    61  		cmd.Flag.Var(explicitStringFlag{value: &load.BuildMod, explicit: &BuildModExplicit}, "mod", "module download mode to use: readonly, vendor, or mod.")
    62  	}
    63  	if mask&OmitSSAFlag != 0 {
    64  		cmd.Flag.BoolVar(&BuildSSA, "ssa", false, "print SSA instruction code")
    65  	}
    66  	if mask&OmitSSATraceFlag != 0 {
    67  		cmd.Flag.BoolVar(&DebugSSATrace, "ssa-trace", false, "trace SSA interpreter code")
    68  	}
    69  	if mask&OmitExperimentalGCFlag != 0 {
    70  		cmd.Flag.BoolVar(&ExperimentalGC, "exp-gc", false, "experimental support runtime.GC")
    71  	}
    72  	cmd.Flag.Var((*tagsFlag)(&BuildContext.BuildTags), "tags", "a comma-separated list of build tags to consider satisfied during the build")
    73  }
    74  
    75  // tagsFlag is the implementation of the -tags flag.
    76  type tagsFlag []string
    77  
    78  func (v *tagsFlag) Set(s string) error {
    79  	// Split on commas, ignore empty strings.
    80  	*v = []string{}
    81  	for _, s := range strings.Split(s, ",") {
    82  		if s != "" {
    83  			*v = append(*v, s)
    84  		}
    85  	}
    86  	return nil
    87  }
    88  
    89  func (v *tagsFlag) String() string {
    90  	return "<TagsFlag>"
    91  }
    92  
    93  // explicitStringFlag is like a regular string flag, but it also tracks whether
    94  // the string was set explicitly to a non-empty value.
    95  type explicitStringFlag struct {
    96  	value    *string
    97  	explicit *bool
    98  }
    99  
   100  func (f explicitStringFlag) String() string {
   101  	if f.value == nil {
   102  		return ""
   103  	}
   104  	return *f.value
   105  }
   106  
   107  func (f explicitStringFlag) Set(v string) error {
   108  	*f.value = v
   109  	if v != "" {
   110  		*f.explicit = true
   111  	}
   112  	return nil
   113  }