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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,47 @@ | ||
package cmd | ||
|
||
import ( | ||
"fmt" | ||
"io" | ||
|
||
"github.com/a8m/envsubst" | ||
"github.com/spf13/cobra" | ||
) | ||
|
||
func newEnvCmd() *cobra.Command { | ||
var envCmd = &cobra.Command{ | ||
Use: "env", | ||
Short: "Manage environment variables", | ||
} | ||
var substCmd = &cobra.Command{ | ||
Use: "subst", | ||
Short: "Substitute environment variables in a string", | ||
RunE: substRunE, | ||
} | ||
envCmd.AddCommand(substCmd) | ||
return envCmd | ||
} | ||
|
||
// Accepts a string as an argument, or reads from stdin if no argument is provided. | ||
func substRunE(cmd *cobra.Command, args []string) error { | ||
var input string | ||
if len(args) > 0 { | ||
input = args[0] | ||
} else { | ||
// Read from stdin | ||
b, err := io.ReadAll(cmd.InOrStdin()) | ||
if err != nil { | ||
return err | ||
} | ||
input = string(b) | ||
} | ||
if input == "" { | ||
return nil | ||
} | ||
output, err := envsubst.String(input) | ||
if err != nil { | ||
return err | ||
} | ||
_, err = fmt.Fprint(cmd.OutOrStdout(), output) | ||
return err | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,97 @@ | ||
package cmd | ||
|
||
import ( | ||
"bytes" | ||
"os" | ||
"testing" | ||
|
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"gotest.tools/v3/assert" | ||
) | ||
|
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func TestSubstRunE(t *testing.T) { | ||
// Set environment variables for testing | ||
err := os.Setenv("ENV_NAME", "world") | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
|
||
testCases := []struct { | ||
name string | ||
input string | ||
output string | ||
}{ | ||
{ | ||
name: "substitute variables", | ||
input: "Hello $ENV_NAME!", | ||
output: "Hello world!", | ||
}, | ||
{ | ||
name: "no variables to substitute", | ||
input: "Hello, world!", | ||
output: "Hello, world!", | ||
}, | ||
{ | ||
name: "empty input", | ||
input: "", | ||
output: "", | ||
}, | ||
{ | ||
name: "no variables JSON", | ||
input: `{"foo": "bar"}`, | ||
output: `{"foo": "bar"}`, | ||
}, | ||
{ | ||
name: "substitute variables JSON", | ||
input: `{"foo": "$ENV_NAME"}`, | ||
output: `{"foo": "world"}`, | ||
}, | ||
{ | ||
name: "no variables key=value", | ||
input: `foo=bar`, | ||
output: `foo=bar`, | ||
}, | ||
} | ||
|
||
// Run tests for each test case as argument | ||
for _, tc := range testCases { | ||
t.Run("arg: "+tc.name, func(t *testing.T) { | ||
// Set up test command | ||
cmd := newEnvCmd() | ||
|
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// Capture output | ||
outputBuf := bytes.Buffer{} | ||
cmd.SetOut(&outputBuf) | ||
|
||
// Run command | ||
cmd.SetArgs([]string{"subst", tc.input}) | ||
err := cmd.Execute() | ||
|
||
// Check output and error | ||
assert.NilError(t, err) | ||
assert.Equal(t, tc.output, outputBuf.String()) | ||
}) | ||
} | ||
// Run tests for each test case as stdin | ||
for _, tc := range testCases { | ||
t.Run("stdin: "+tc.name, func(t *testing.T) { | ||
// Set up test command | ||
cmd := newEnvCmd() | ||
|
||
// Set up input | ||
inputBuf := bytes.NewBufferString(tc.input) | ||
cmd.SetIn(inputBuf) | ||
|
||
// Capture output | ||
outputBuf := bytes.Buffer{} | ||
cmd.SetOut(&outputBuf) | ||
|
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// Run command | ||
cmd.SetArgs([]string{"subst"}) | ||
err = cmd.Execute() | ||
|
||
// Check output and error | ||
assert.NilError(t, err) | ||
assert.Equal(t, tc.output, outputBuf.String()) | ||
}) | ||
} | ||
} |
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