more tests

1 files changed, 114 insertions, 0 deletions

diff --git a/internal/textutil/textutil.go b/internal/textutil/textutil.go
new file mode 100644
index 0000000..7ef2680
--- /dev/null
+++ b/internal/textutil/textutil.go
@@ -0,0 +1,114 @@
+package textutil
+
+import "strings"
+
+// RenderTemplate performs simple {{var}} replacement in a template string.
+func RenderTemplate(t string, vars map[string]string) string {
+    if t == "" || len(vars) == 0 {
+        return t
+    }
+    out := t
+    for k, v := range vars {
+        out = strings.ReplaceAll(out, "{{"+k+"}}", v)
+    }
+    return out
+}
+
+// StripCodeFences removes surrounding Markdown triple-backtick fences.
+func StripCodeFences(s string) string {
+    t := strings.TrimSpace(s)
+    if t == "" {
+        return t
+    }
+    lines := strings.Split(t, "\n")
+    start := 0
+    for start < len(lines) && strings.TrimSpace(lines[start]) == "" {
+        start++
+    }
+    end := len(lines) - 1
+    for end >= 0 && strings.TrimSpace(lines[end]) == "" {
+        end--
+    }
+    if start >= len(lines) || end < 0 || start > end {
+        return t
+    }
+    first := strings.TrimSpace(lines[start])
+    last := strings.TrimSpace(lines[end])
+    if strings.HasPrefix(first, "```") && last == "```" && end > start {
+        inner := strings.Join(lines[start+1:end], "\n")
+        return inner
+    }
+    return t
+}
+
+// InstructionFromSelection extracts the first inline instruction and returns
+// (instruction, cleanedSelection). It detects markers on the earliest position
+// per line in precedence: strict ;text;, /* */, <!-- -->, //, #, --.
+func InstructionFromSelection(sel string) (string, string) {
+    lines := strings.Split(sel, "\n")
+    for idx, line := range lines {
+        if instr, cleaned, ok := FindFirstInstructionInLine(line); ok && strings.TrimSpace(instr) != "" {
+            lines[idx] = cleaned
+            return instr, strings.Join(lines, "\n")
+        }
+    }
+    return "", sel
+}
+
+// FindFirstInstructionInLine returns (instruction, cleaned, ok) for a single line.
+func FindFirstInstructionInLine(line string) (instr, cleaned string, ok bool) {
+    type cand struct{ start, end int; text string }
+    cands := []cand{}
+    if t, l, r, ok := FindStrictInlineTag(line); ok {
+        cands = append(cands, cand{start: l, end: r, text: t})
+    }
+    if i := strings.Index(line, "/*"); i >= 0 {
+        if j := strings.Index(line[i+2:], "*/"); j >= 0 {
+            start := i
+            end := i + 2 + j + 2
+            text := strings.TrimSpace(line[i+2 : i+2+j])
+            cands = append(cands, cand{start: start, end: end, text: text})
+        }
+    }
+    if i := strings.Index(line, "<!--"); i >= 0 {
+        if j := strings.Index(line[i+4:], "-->"); j >= 0 {
+            start := i
+            end := i + 4 + j + 3
+            text := strings.TrimSpace(line[i+4 : i+4+j])
+            cands = append(cands, cand{start: start, end: end, text: text})
+        }
+    }
+    if i := strings.Index(line, "//"); i >= 0 {
+        cands = append(cands, cand{start: i, end: len(line), text: strings.TrimSpace(line[i+2:])})
+    }
+    if i := strings.Index(line, "#"); i >= 0 {
+        cands = append(cands, cand{start: i, end: len(line), text: strings.TrimSpace(line[i+1:])})
+    }
+    if i := strings.Index(line, "--"); i >= 0 {
+        cands = append(cands, cand{start: i, end: len(line), text: strings.TrimSpace(line[i+2:])})
+    }
+    if len(cands) == 0 { return "", line, false }
+    best := cands[0]
+    for _, c := range cands[1:] {
+        if c.start >= 0 && (best.start < 0 || c.start < best.start) { best = c }
+    }
+    cleaned = strings.TrimRight(line[:best.start]+line[best.end:], " \t")
+    return best.text, cleaned, true
+}
+
+// FindStrictInlineTag finds ;text; with no spaces after/before semicolons.
+func FindStrictInlineTag(line string) (text string, left, right int, ok bool) {
+    for i := 0; i < len(line); i++ {
+        if line[i] != ';' { continue }
+        if i+1 < len(line) && line[i+1] == ' ' { continue }
+        for j := i + 1; j < len(line); j++ {
+            if line[j] == ';' {
+                if j-1 >= 0 && line[j-1] == ' ' { continue }
+                inner := strings.TrimSpace(line[i+1 : j])
+                if inner != "" { return inner, i, j + 1, true }
+            }
+        }
+    }
+    return "", -1, -1, false
+}
+