feat: Add R language support

[sims1253]

codedb has no support for R (.r / .R files). Users with R projects receive no code intelligence — no outline, no symbol search, no import tracking.

Proposed Solution

Add a line-by-line R parser (parseRLine) following the existing pattern used by Ruby, Go, PHP, etc.:

• Functions: <- function( and = function( assignment patterns
• Anonymous functions: bare function( at line start
• S4 classes: setClass("ClassName")
• Reference classes: setRefClass("ClassName")
• R6 classes: R6Class(classname = "...") (single-line)
• Imports: library(pkg) and require(pkg)
• Comments: # prefix (same as Python/Ruby)

Files: src/explore.zig, src/telemetry.zig, src/tests.zig

Expected

• .r and .R files are indexed with correct language detection
• Functions, classes, and imports are extracted from R source

[justrach]

@codex review?

[chatgpt-codex-connector]

Summary

• Added first-class R language detection by introducing r_lang to the Language enum and mapping both .r and .R extensions in detectLanguage. src/explore.zigL69-L103
• Wired R parsing into the indexing pipeline and implemented parseRLine support for:
  • function assignments (<- function( and = function(),
  • anonymous top-level function( definitions,
  • setClass(...), setRefClass(...), and R6Class(classname = "..."),
  • library(...) / require(...) imports. src/explore.zigL275-L312 src/explore.zigL1622-L1706
• Added R-specific parsing helpers for identifier extraction and import parsing, and enabled # comment compaction behavior for R in isCommentOrBlank. src/explore.zigL2338-L2377 src/explore.zigL1939-L1948
• Fixed telemetry language-mask serialization ordering by adding missing php/ruby entries and new r_lang, so bit positions align with the Language enum indices. src/telemetry.zigL323-L340
• Added/updated tests for R comment handling, .r/.R detection, R parser symbol/import extraction, and malformed/commented R input robustness. src/tests.zigL1860-L1863 src/tests.zigL2015-L2035 src/tests.zigL4550-L4598

Testing

• ⚠️ zig fmt src/explore.zig src/telemetry.zig src/tests.zig (warning: zig not installed in this environment)
• ✅ git diff --check
• ✅ git status --short
• ✅ git show --stat --oneline HEAD

Also completed requested workflow actions:

• Committed changes on branch work as f217b0e.
• Created a follow-up PR entry via make_pr with title: “follow-up: add R language detection, parsing, and telemetry language mapping”.

View task →

[justrach]

Fixed in PR #257. R language support: function assignment (<-/=), setClass/setRefClass class defs, library/require imports, .r/.R detection, # comment handling. 5 new tests.