feat: flagsmith eval (#53)

beep boop

Author: khvn26

README.md

@@ -72,6 +72,7 @@ flagsmith flag list    # list the flags in the current environment
 - `flagsmith environment list|get|create|update|delete|clone` (alias `env`) — manage environments (by name or API key).
 - `flagsmith environment key list|create|delete <environment>` — manage server-side SDK keys.
 - `flagsmith environment document [environment]` — output the environment document (local-evaluation JSON).
+- `flagsmith evaluate [feature]` (alias `eval`) — the flags an SDK resolves for the current environment (`--identity`, `--trait key=value`, `--persist`); `--js` writes the state a frontend SDK hydrates from, `--test` fails when a named flag is disabled.
 - `flagsmith config` — show the resolved context and where each value comes from.
 - `flagsmith login` / `logout` — browser OAuth (PKCE, loopback); also `auth login`/`auth logout`.
 - `flagsmith auth status` — identity, organisations, credential source, token expiry.
@@ -83,18 +84,3 @@ flagsmith flag list    # list the flags in the current environment
 - `--json` (or `FLAGSMITH_JSON_OUTPUT`) for machine-readable output; `--jq <expr>` to filter it.
 - Static credentials: `FLAGSMITH_API_KEY` (Admin API), `FLAGSMITH_ENVIRONMENT_KEY` (SDK).
 - Self-hosted: `--api-url` or `FLAGSMITH_API_URL`.
-
-## Design
-
-[Installation](docs/design/01-installation.md) ·
-[Output & interactivity](docs/design/02-output-and-interactivity.md) ·
-[Authentication](docs/design/03-authentication.md) ·
-[Project config](docs/design/04-project-config.md) ·
-[CRUD conventions](docs/design/05-crud.md) ·
-[API](docs/design/06-api.md) ·
-[Flags](docs/design/07-flags.md) ·
-[Segments](docs/design/08-segments.md) ·
-[Features](docs/design/09-features.md) ·
-[Projects & organisations](docs/design/10-projects-organisations.md) ·
-[Environments](docs/design/11-environments.md) ·
-[Evaluate](docs/design/12-evaluate.md)

go.mod

@@ -3,20 +3,22 @@ module github.com/Flagsmith/flagsmith-cli/v2
 go 1.26
 
 require (
+	github.com/Flagsmith/flagsmith-go-client/v5 v5.1.0
 	github.com/charmbracelet/huh v1.0.0
 	github.com/fatih/color v1.19.0
 	github.com/itchyny/gojq v0.12.19
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/pflag v1.0.9
 	github.com/zalando/go-keyring v0.2.8
-	golang.org/x/sync v0.15.0
+	golang.org/x/sync v0.16.0
 	golang.org/x/term v0.45.0
 )
 
 require (
 	github.com/atotto/clipboard v0.1.4 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/blang/semver/v4 v4.0.0 // indirect
 	github.com/catppuccin/go v0.3.0 // indirect
 	github.com/charmbracelet/bubbles v0.21.1-0.20250623103423-23b8fd6302d7 // indirect
 	github.com/charmbracelet/bubbletea v1.3.6 // indirect
@@ -31,9 +33,11 @@ require (
 	github.com/danieljoos/wincred v1.2.3 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
+	github.com/go-resty/resty/v2 v2.17.2 // indirect
 	github.com/godbus/dbus/v5 v5.2.2 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/itchyny/timefmt-go v0.1.8 // indirect
+	github.com/itlightning/dateparse v0.2.1 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
@@ -43,8 +47,10 @@ require (
 	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0 // indirect
+	github.com/ohler55/ojg v1.28.1 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	golang.org/x/net v0.43.0 // indirect
 	golang.org/x/sys v0.47.0 // indirect
-	golang.org/x/text v0.23.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+github.com/Flagsmith/flagsmith-go-client/v5 v5.1.0 h1:/1KMxWHfzo8I7FnZ0mnMw+ICM4HVZvCEYTJ4idM2VEU=
+github.com/Flagsmith/flagsmith-go-client/v5 v5.1.0/go.mod h1:CjTs0XAIJXG+08lf4h51W9cjvrNaK92TLVYtjPrnI3w=
 github.com/MakeNowJust/heredoc v1.0.0 h1:cXCdzVdstXyiTqTvfqk9SDHpKNjxuom+DOlyEeQ4pzQ=
 github.com/MakeNowJust/heredoc v1.0.0/go.mod h1:mG5amYoWBHf8vpLOuehzbGGw0EHxpZZ6lCpQ4fNJ8LE=
 github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
@@ -6,6 +8,8 @@ github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiE
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/aymanbagabas/go-udiff v0.3.1 h1:LV+qyBQ2pqe0u42ZsUEtPiCaUoqgA9gYRDs3vj1nolY=
 github.com/aymanbagabas/go-udiff v0.3.1/go.mod h1:G0fsKmG+P6ylD0r6N/KgQD/nWzgfnl8ZBcNLgcbrw8E=
+github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
+github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
 github.com/catppuccin/go v0.3.0 h1:d+0/YicIq+hSTo5oPuRi5kOpqkVA5tAsU6dNhvRu+aY=
 github.com/catppuccin/go v0.3.0/go.mod h1:8IHJuMGaUUjQM82qBrGNBv7LFq6JI3NnQCF6MOlZjpc=
 github.com/charmbracelet/bubbles v0.21.1-0.20250623103423-23b8fd6302d7 h1:JFgG/xnwFfbezlUnFMJy0nusZvytYysV4SCS2cYbvws=
@@ -53,14 +57,20 @@ github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
 github.com/fatih/color v1.19.0 h1:Zp3PiM21/9Ld6FzSKyL5c/BULoe/ONr9KlbYVOfG8+w=
 github.com/fatih/color v1.19.0/go.mod h1:zNk67I0ZUT1bEGsSGyCZYZNrHuTkJJB+r6Q9VuMi0LE=
+github.com/go-resty/resty/v2 v2.17.2 h1:FQW5oHYcIlkCNrMD2lloGScxcHJ0gkjshV3qcQAyHQk=
+github.com/go-resty/resty/v2 v2.17.2/go.mod h1:kCKZ3wWmwJaNc7S29BRtUhJwy7iqmn+2mLtQrOyQlVA=
 github.com/godbus/dbus/v5 v5.2.2 h1:TUR3TgtSVDmjiXOgAAyaZbYmIeP3DPkld3jgKGV8mXQ=
 github.com/godbus/dbus/v5 v5.2.2/go.mod h1:3AAv2+hPq5rdnr5txxxRwiGjPXamgoIHgz9FPBfOp3c=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/itchyny/gojq v0.12.19 h1:ttXA0XCLEMoaLOz5lSeFOZ6u6Q3QxmG46vfgI4O0DEs=
 github.com/itchyny/gojq v0.12.19/go.mod h1:5galtVPDywX8SPSOrqjGxkBeDhSxEW1gSxoy7tn1iZY=
 github.com/itchyny/timefmt-go v0.1.8 h1:1YEo1JvfXeAHKdjelbYr/uCuhkybaHCeTkH8Bo791OI=
 github.com/itchyny/timefmt-go v0.1.8/go.mod h1:5E46Q+zj7vbTgWY8o5YkMeYb4I6GeWLFnetPy5oBrAI=
+github.com/itlightning/dateparse v0.2.1 h1:AB0NJTyI0HYcerEUMovKZOiQVBg1mBPxgAnWQwzLP6g=
+github.com/itlightning/dateparse v0.2.1/go.mod h1:xHlmL8lT0L9JIBlaKotRwsoDYpKJskXpiU9ZwbbSkNA=
 github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
 github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-colorable v0.1.14 h1:9A9LHSqF/7dyVVX6g0U9cwm9pG3kP9gSzcuIPHPsaIE=
@@ -79,6 +89,8 @@ github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELU
 github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
 github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc=
 github.com/muesli/termenv v0.16.0/go.mod h1:ZRfOIKPFDYQoDFF4Olj7/QJbW60Ol/kL1pU3VfY/Cnk=
+github.com/ohler55/ojg v1.28.1 h1:Xy93DelhLSZNeWv8GPKtP6qMqkUlZlAxBP/AQcC5RfY=
+github.com/ohler55/ojg v1.28.1/go.mod h1:/Y5dGWkekv9ocnUixuETqiL58f+5pAsUfg5P8e7Pa2o=
 github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ=
 github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -94,24 +106,30 @@ github.com/stretchr/objx v0.5.2 h1:xuMeJ0Sdp5ZMRXx/aWO6RZxdr3beISkG5/G/aIRr3pY=
 github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a h1:a6TNDN9CgG+cYjaeN8l2mc4kSz2iMiCDQxPEyltUV/I=
+github.com/tailscale/hujson v0.0.0-20250605163823-992244df8c5a/go.mod h1:EbW0wDK/qEUYI0A5bqq0C2kF8JTQwWONmGDBbzsxxHo=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
 github.com/zalando/go-keyring v0.2.8 h1:6sD/Ucpl7jNq10rM2pgqTs0sZ9V3qMrqfIIy5YPccHs=
 github.com/zalando/go-keyring v0.2.8/go.mod h1:tsMo+VpRq5NGyKfxoBVjCuMrG47yj8cmakZDO5QGii0=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
-golang.org/x/sync v0.15.0 h1:KWH3jNZsfyT6xfAfKiz6MRNmd46ByHDYaZ7KSkCtdW8=
-golang.org/x/sync v0.15.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
+golang.org/x/net v0.43.0 h1:lat02VYK2j4aLzMzecihNvTlJNQUq316m2Mr9rnM6YE=
+golang.org/x/net v0.43.0/go.mod h1:vhO1fvI4dGsIjh73sWfUVjj3N7CA9WkKJNQm2svM6Jg=
+golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
+golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
 golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
 golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/term v0.45.0 h1:NwWyBmoJCbfTHpxrWoZ9C6/VxOf7ic219I8xZZFdrf0=
 golang.org/x/term v0.45.0/go.mod h1:9aqxs0blBcrm/n0L9QW0aRVD+ktan8ssZromtqJC43w=
-golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
-golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
+golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
+golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
+golang.org/x/time v0.12.0 h1:ScB/8o8olJvc+CQPWrK3fPZNfh7qgwCrY0zJmoEQLSE=
+golang.org/x/time v0.12.0/go.mod h1:CDIdPxbZBQxdj6cxyCIdrNogrJKMJ7pr37NYpMcMDSg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/cmd/api.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -97,7 +96,7 @@ func runAPI(cmd *cobra.Command, args []string) error {
 // apiTarget resolves the base URL and the auth applier for the chosen surface.
 func apiTarget(cmd *cobra.Command, pc *projectContext) (string, func(*http.Request), error) {
 	if apiSDKFlag {
-		key, err := sdkEnvironmentKey(pc)
+		key, err := sdkEnvironmentKey(cmd, pc)
 		if err != nil {
 			return "", nil, err
 		}
@@ -112,20 +111,6 @@ func apiTarget(cmd *cobra.Command, pc *projectContext) (string, func(*http.Reque
 	return apiURL, cred.auth.Apply, nil
 }
 
-// sdkEnvironmentKey returns the client- or server-side key for --sdk calls,
-// taken verbatim from the environment context (no Admin name resolution).
-func sdkEnvironmentKey(pc *projectContext) (string, error) {
-	sdkURL, _ := pc.SDKAPIURL.Value.(string)
-	if _, v := envCredential(envEnvironmentKey, sdkURL, defaultSDKAPIURL); v != "" {
-		return v, nil
-	}
-	if k, ok := pc.Environment.Value.(string); ok && k != "" {
-		return k, nil
-	}
-	return "", withHint(errors.New("no environment key"),
-		"Set FLAGSMITH_ENVIRONMENT_KEY, or pass -e.")
-}
-
 // apiRequestBody builds the request body (or query params) and resolves the
 // method: explicit --method, else POST when a body/field is present, else GET.
 func apiRequestBody(cmd *cobra.Command) (body []byte, contentType string, query url.Values, method string, err error) {