Merge pull request #1094 from hashicorp/f-gsub
config: add "replace" function [GH-1029]
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commit
76e3cfcf31
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@ -4,6 +4,7 @@ import (
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"bytes"
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"fmt"
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"io/ioutil"
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"regexp"
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"strconv"
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"strings"
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@ -15,11 +16,15 @@ var Funcs map[string]ast.Function
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func init() {
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Funcs = map[string]ast.Function{
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"concat": interpolationFuncConcat(),
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"file": interpolationFuncFile(),
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"join": interpolationFuncJoin(),
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"element": interpolationFuncElement(),
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"replace": interpolationFuncReplace(),
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"split": interpolationFuncSplit(),
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// Concat is a little useless now since we supported embeddded
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// interpolations but we keep it around for backwards compat reasons.
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"concat": interpolationFuncConcat(),
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}
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}
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@ -79,6 +84,33 @@ func interpolationFuncJoin() ast.Function {
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}
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}
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// interpolationFuncReplace implements the "replace" function that does
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// string replacement.
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func interpolationFuncReplace() ast.Function {
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return ast.Function{
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ArgTypes: []ast.Type{ast.TypeString, ast.TypeString, ast.TypeString},
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ReturnType: ast.TypeString,
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Callback: func(args []interface{}) (interface{}, error) {
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s := args[0].(string)
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search := args[1].(string)
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replace := args[2].(string)
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// We search/replace using a regexp if the string is surrounded
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// in forward slashes.
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if len(search) > 1 && search[0] == '/' && search[len(search)-1] == '/' {
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re, err := regexp.Compile(search[1 : len(search)-1])
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if err != nil {
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return nil, err
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}
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return re.ReplaceAllString(s, replace), nil
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}
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return strings.Replace(s, search, replace, -1), nil
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},
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}
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}
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// interpolationFuncSplit implements the "split" function that allows
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// strings to split into multi-variable values
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func interpolationFuncSplit() ast.Function {
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@ -107,6 +107,46 @@ func TestInterpolateFuncJoin(t *testing.T) {
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})
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}
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func TestInterpolateFuncReplace(t *testing.T) {
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testFunction(t, testFunctionConfig{
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Cases: []testFunctionCase{
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// Regular search and replace
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{
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`${replace("hello", "hel", "bel")}`,
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"bello",
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false,
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},
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// Search string doesn't match
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{
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`${replace("hello", "nope", "bel")}`,
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"hello",
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false,
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},
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// Regular expression
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{
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`${replace("hello", "/l/", "L")}`,
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"heLLo",
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false,
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},
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{
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`${replace("helo", "/(l)/", "$1$1")}`,
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"hello",
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false,
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},
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// Bad regexp
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{
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`${replace("helo", "/(l/", "$1$1")}`,
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nil,
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true,
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},
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},
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})
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}
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func TestInterpolateFuncSplit(t *testing.T) {
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testFunction(t, testFunctionConfig{
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Cases: []testFunctionCase{
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@ -225,7 +265,9 @@ func testFunction(t *testing.T, config testFunctionConfig) {
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}
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if !reflect.DeepEqual(out, tc.Result) {
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t.Fatalf("%d: bad: %#v", i, out)
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t.Fatalf(
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"%d: bad output for input: %s\n\nOutput: %#v",
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i, tc.Input, out)
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}
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}
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}
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@ -69,6 +69,13 @@ The supported built-in functions are:
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* `concat(args...)` - Concatenates the values of multiple arguments into
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a single string.
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* `element(list, index)` - Returns a single element from a list
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at the given index. If the index is greater than the number of
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elements, this function will wrap using a standard mod algorithm.
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A list is only possible with splat variables from resources with
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a count greater than one.
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Example: `element(aws_subnet.foo.*.id, count.index)`
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* `file(path)` - Reads the contents of a file into the string. Variables
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in this file are _not_ interpolated. The contents of the file are
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read as-is.
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@ -77,18 +84,19 @@ The supported built-in functions are:
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only possible with splat variables from resources with a count
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greater than one. Example: `join(",", aws_instance.foo.*.id)`
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* `split(delim, string)` - Splits the string previously created by `join`
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back into a list. This is useful for pushing lists through module
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outputs since they currently only support string values.
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Example: `split(",", module.amod.server_ids)`
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* `lookup(map, key)` - Performs a dynamic lookup into a mapping
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variable. The `map` parameter should be another variable, such
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as `var.amis`.
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* `element(list, index)` - Returns a single element from a list
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at the given index. If the index is greater than the number of
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elements, this function will wrap using a standard mod algorithm.
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A list is only possible with splat variables from resources with
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a count greater than one.
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Example: `element(aws_subnet.foo.*.id, count.index)`
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* `replace(string, search, replace)` - Does a search and replace on the
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given string. All instances of `search` are replaced with the value
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of `replace`. If `search` is wrapped in forward slashes, it is treated
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as a regular expression. If using a regular expression, `replace`
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can reference subcaptures in the regular expression by using `$n` where
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`n` is the index or name of the subcapture. If using a regular expression,
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the syntax conforms to the [re2 regular expression syntax](https://code.google.com/p/re2/wiki/Syntax).
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* `split(delim, string)` - Splits the string previously created by `join`
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back into a list. This is useful for pushing lists through module
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outputs since they currently only support string values.
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Example: `split(",", module.amod.server_ids)`
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