M.V. Hutz
62699a0e37
## Description The lambda CLI previously only supported inline string expressions and stdin input. This PR adds support for reading lambda expressions from files using the `-f` flag. This makes it easier to work with larger programs stored in files. Changes: - Added `FileSource` type to `internal/config/source.go` for reading from file paths. - Added `-f` flag to CLI argument parser with validation to prevent conflicting inputs. - Updated Makefile targets (`run`, `profile`, `explain`) to use `-f` flag instead of stdin redirection. ### Decisions The `-f` flag takes precedence over positional arguments. If both are specified, an error is returned to avoid ambiguity. ## Benefits - More intuitive workflow for file-based lambda programs. - Cleaner Makefile targets without stdin redirection. - Consistent with common CLI conventions (e.g., `grep -f`, `awk -f`). ## Checklist - [x] Code follows conventional commit format. - [x] Branch follows naming convention (`<type>/<description>`). - [ ] Tests pass (if applicable). - [ ] Documentation updated (if applicable). Reviewed-on: #12 Co-authored-by: M.V. Hutz <git@maximhutz.me> Co-committed-by: M.V. Hutz <git@maximhutz.me>
47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package config
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import (
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"flag"
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"fmt"
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)
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// Extract the program configuration from the command-line arguments.
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func FromArgs() (*Config, error) {
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// Relevant flags.
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verbose := flag.Bool("v", false, "Verbosity. If set, the program will print logs.")
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explanation := flag.Bool("x", false, "Explanation. Whether or not to show all reduction steps.")
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statistics := flag.Bool("s", false, "Statistics. If set, the process will print various statistics about the run.")
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profile := flag.String("p", "", "CPU profiling. If an output file is defined, the program will profile its execution and dump its results into it.")
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file := flag.String("f", "", "File. If set, read source from the specified file.")
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flag.Parse()
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// Parse source type.
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var source Source
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if *file != "" {
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// File flag takes precedence.
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if flag.NArg() > 0 {
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return nil, fmt.Errorf("cannot specify both -f flag and positional argument")
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}
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source = FileSource{Path: *file}
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} else if flag.NArg() == 0 {
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return nil, fmt.Errorf("no input given")
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} else if flag.NArg() > 1 {
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return nil, fmt.Errorf("more than 1 command-line argument")
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} else {
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// Positional argument.
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if flag.Arg(0) == "-" {
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source = StdinSource{}
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} else {
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source = StringSource{Data: flag.Arg(0)}
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}
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}
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return &Config{
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Source: source,
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Verbose: *verbose,
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Explanation: *explanation,
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Profile: *profile,
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Statistics: *statistics,
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}, nil
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}
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